Mycology Education · Reference Guide
Mushroom & Mycology Glossary: Complete A-Z Reference (UK)
Quick Answer
This glossary defines over 45 key terms used across mushroom cultivation, spore microscopy, functional mushroom wellness, and UK mycology education. Terms cover everything from mycelium and fruiting bodies to spore syringes, contamination, and beta-glucans , with plain-English definitions and links to SporeBuddies guides for each topic area.
Why This Matters
Mycology has its own language. Whether you are reading a grow kit guide, studying spore prints under a microscope, or researching functional mushrooms, encountering unfamiliar terms can slow your progress significantly.
This reference page gives you clear definitions for the words that appear most often across SporeBuddies guides, product descriptions, and the wider UK growing community. Bookmark it and return whenever a term needs clarifying.
Jump to section
🍄 Mycology Basics
Fruiting body
Structure
The visible, above-ground structure of a fungus. In mushroom growing, the fruiting body is what most people recognise as a “mushroom”. It develops after mycelium has fully colonised a substrate and environmental conditions trigger the reproductive cycle.
The fruiting body produces and releases spores. For functional mushrooms such as Lion’s Mane and Turkey Tail, the fruiting body is the part most often used in extracts and supplements.
Fungi
Kingdom
The kingdom of life that includes mushrooms, moulds, yeasts, and other organisms. Fungi are neither plants nor animals. They decompose organic matter and absorb nutrients through their cell walls. Mycology is the scientific study of fungi.
Genus
Taxonomy
A level of biological classification used in taxonomy, grouping related species together. In mycology, species like Psilocybe cubensis, Hericium erinaceus, and Trametes versicolor are each assigned to a genus. The genus name is always italicised and capitalised in scientific writing.
Hyphae
Structure
The thread-like, branching filaments that make up fungal networks. Hyphae grow and interconnect to form mycelium. Under a microscope, hyphae are the visible structural units of fungal growth and can be examined directly in spore research.
Mycelium
Structure
The vegetative network of a fungus, made up of interconnected hyphae. Mycelium colonises substrate, absorbs nutrients, and eventually produces a fruiting body under the right conditions. Healthy mycelium is typically white to off-white, firm, and rope-like in appearance. Thin, grey, or cobweb-like growth may indicate contamination.
Primordium (plural: primordia)
Growth stage
The earliest visible formation of a mushroom, commonly called a “pin”. Primordia appear on colonised substrate when environmental conditions (humidity, fresh air exchange, and temperature) that trigger the fruiting phase. Encouraging strong primordium formation is one of the most important steps in home cultivation.
Sporulation
Biology
The process by which a mature mushroom produces and releases spores. Sporulation typically occurs as caps open and flatten at maturity. For microscopy, harvesting a spore print before heavy sporulation prevents excessive spore drop onto the substrate and surrounding environment.
Taxonomy
Classification
The science of classifying and naming organisms. In mycology, taxonomy assigns genus and species names based on physical characteristics, spore morphology, chemical makeup, and genetic data. Strain names commonly used in the growing community (such as “Golden Teacher” or “B+”) are informal cultural labels, not formal taxonomic classifications.
🌱 Cultivation Terms
Agar
Lab technique
A gelatinous medium derived from seaweed, used in mycology to culture, isolate, and clone fungal mycelium. Agar is sterilised, poured into petri dishes, and inoculated with spores or mycelium samples. It allows growers to observe growth patterns, identify contamination early, and develop strong cultures before transferring to grain or substrate.
See: Agar & Growth Medium Supplies | How to Use a Spore Print on Agar
Bulk substrate
Growing medium
The main growing medium used after grain spawn has been prepared. Common bulk substrates include coco coir, straw, hardwood sawdust, and masters mix (a hardwood and soy hull blend). Grain spawn is mixed into bulk substrate to begin colonisation and, eventually, fruiting.
Casing layer
Cultivation
A thin, nutrient-poor layer applied over colonised substrate to retain moisture and trigger pinning. Casing is typically a blend of coco coir, vermiculite, and water. It creates the microclimate needed for primordia to form and protects the colonised bulk from surface drying.
Colonisation
Growth stage
The stage in mushroom cultivation when mycelium spreads through and fully occupies a substrate or grain bag. Full colonisation is the prerequisite for fruiting. Under-colonised substrate is vulnerable to contamination. A fully colonised bag or tub is recognisably white, firm, and uniform in appearance.
FAE: Fresh Air Exchange
Environment
The process of introducing fresh, CO2-poor air into a fruiting chamber. Elevated CO2 from respiring mycelium can inhibit pinning and cause elongated, poorly developed fruiting bodies. FAE is achieved by fanning, opening lids, or using grow tents with air-permeable filters. Balancing FAE with humidity retention is one of the key challenges in home growing.
See: Growing Equipment
Field capacity
Substrate prep
The correct moisture level for a prepared substrate. At field capacity, substrate holds the maximum amount of water without pooling or dripping excessively. When you squeeze a handful firmly, only a few drops should run from between your fingers. Under-hydrated substrate stalls growth; over-hydrated substrate invites bacterial contamination.
Flush
Harvest
A single fruiting cycle in which a batch of mushrooms develops, matures, and is harvested from a colonised substrate. Most setups produce multiple flushes from the same substrate. First flushes are typically the most productive. Subsequent flushes require the substrate to be rehydrated.
Flow hood
Lab equipment
A laminar flow cabinet used to create a contamination-free working area during inoculation and agar work. Flow hoods use HEPA filters to push sterile, particle-free air across a work surface. Professional growers use flow hoods to eliminate airborne contaminants that a still air box cannot fully control.
Grain spawn
Cultivation
Sterilised cereal grain (typically rye, wheat, or oat), colonised with mycelium. Grain spawn is the intermediary step between agar culture and bulk substrate. Its high surface area and nutrient content allows mycelium to colonise rapidly. SporeBuddies stocks ready-to-inoculate sterilised rye grain bags.
Inoculation
Process
The process of introducing spores or liquid culture into a sterile substrate, grain bag, or agar plate. Inoculation marks the beginning of the colonisation phase. It must be performed in a clean environment, such as a still air box or flow hood, to minimise contamination risk.
See: Inoculation Tools
Liquid culture
Cultivation
A nutrient-rich liquid medium colonised with active mycelium. Liquid culture is used to inoculate grain bags and substrate directly, offering faster colonisation than spore syringes. SporeBuddies stocks liquid cultures for functional and gourmet species including Lion’s Mane and Cordyceps militaris.
Monotub
Equipment
A large, single-tub fruiting chamber used to produce mushrooms in bulk. A monotub typically holds 10–25 litres of colonised substrate and uses holes or gaskets in the sides or lid for fresh air exchange. It is a popular setup for maximising yield per grow cycle.
Pasteurisation
Substrate prep
A heat treatment used to reduce contamination risk in bulk substrates without fully sterilising them. Unlike full sterilisation, pasteurisation targets harmful bacteria and competitor organisms while leaving beneficial microorganisms alive. Most bulk substrates such as coco coir and straw are pasteurised rather than sterilised.
PF-Tek
Method
A beginner-friendly growing method using brown rice flour and vermiculite in small jars as the substrate. PF-Tek jars are sterilised, inoculated with a spore syringe, and colonised before being “birthed” from the jar for fruiting. It remains one of the most accessible entry-level cultivation techniques.
Spawn
Cultivation
Colonised grain, sawdust, or other medium used to inoculate and colonise larger volumes of bulk substrate. Spawn transfers active mycelium into the main growing medium, accelerating colonisation across the bulk. See also: grain spawn.
Sterilisation
Lab technique
A process that eliminates all microbial life from a substrate or grain bag, including heat-resistant bacterial endospores. Full sterilisation requires a pressure cooker or autoclave operating at 15 PSI for an extended period. It is necessary for grain spawn and nutrient-rich substrates where pasteurisation alone is insufficient.
Still air box (SAB)
Equipment
A clear storage container used as a low-tech, low-turbulence workspace for inoculation and agar transfers. The SAB reduces airborne contaminant exposure by enclosing the working area. Arms enter through holes cut in the sides. It is a practical, affordable alternative to a flow hood for home growers just starting out.
Substrate
Growing medium
The growing medium that provides nutrients and structure for mycelium and fruiting bodies. Substrates vary by mushroom species. Common examples include brown rice flour, straw, coco coir, hardwood sawdust, and masters mix. Substrate preparation (sterilisation or pasteurisation) is one of the most important contamination prevention steps in any grow.
Substrate choice has a major impact on yield. Masters mix is high-yield but must be fully sterilised. Coco coir is more forgiving for beginners and can be pasteurised at home.
🔬 Spores & Microscopy
Microscopy
Research
The scientific study of objects too small to see with the naked eye, using optical or electron microscopes. In mycology, microscopy is used to observe spore morphology, structure, germination, and species characteristics. SporeBuddies sells mushroom spores legally in the UK strictly for microscopy and research purposes.
See: Beginner Guide to Mycology Microscopy (UK) | How to Study Mushroom Spores Under a Microscope
Spore
Biology
A microscopic reproductive cell produced by fungi. Spores are capable of developing into new mycelium under suitable conditions. They are the unit studied under a microscope in spore research and are the basis for producing spore prints and preparing spore syringes. Spore morphology (size, shape, and surface texture) varies between species and is used in identification.
Spore print
Research tool
A deposit of spores released by a mushroom cap onto a surface such as paper, glass, or foil. Spore prints are created by placing a cap gill-side down and leaving it undisturbed for several hours. The resulting print records spore colour and pattern, and can be used for identification or for creating spore syringes.
See: How to Make a Spore Print | Spore Prints Explained | Glossary: Spore Print
Spore syringe
Research tool
A plastic syringe filled with a sterile water solution containing mushroom spores. Spore syringes are used in microscopy research to prepare slides for observation. SporeBuddies’ double-density spore syringes contain a higher concentration of spores than standard products, offering enhanced clarity during microscopic examination.
See: Spore Syringes | How to Use a Spore Syringe for Microscopy
Spore swab
Research tool
A sterile cotton swab used to collect spores directly from a mushroom surface or spore print. Swabs can be stored, transported, or used to prepare microscopy slides and cultures. They offer an alternative collection format to syringes and are particularly useful for archiving spore samples.
See: Spore Swabs
🧠 Functional Mushrooms
Adaptogen
Wellness
A substance thought to help the body adapt to physical and psychological stress. Several functional mushrooms, including Cordyceps and Reishi, are described as adaptogens in wellness and traditional medicine contexts. The scientific evidence for specific adaptogenic claims varies considerably between species, preparation methods, and individuals.
Beta-glucan
Compound
A type of polysaccharide (complex carbohydrate) found in the cell walls of fungi and some plants. Beta-glucans are among the most studied compounds in functional mushroom research and are particularly associated with Turkey Tail (Trametes versicolor) and Lion’s Mane (Hericium erinaceus) in immune and wellness discussions.
Cordyceps militaris
Species
Cordyceps militaris is a cultivated species used in functional mushroom products. Unlike wild Cordyceps sinensis, Cordyceps militaris can be grown on grain substrate in controlled environments. It is associated with research into ATP production, oxygen utilisation, and athletic endurance, though the evidence base is still developing. SporeBuddies stocks both liquid cultures and tinctures.
Dual extraction
Preparation
A supplement preparation method that uses both a water-based and an alcohol-based extraction to capture different beneficial compounds from a mushroom. Water extraction draws out polysaccharides (including beta-glucans); alcohol extraction draws out triterpenes and other fat-soluble compounds. Many high-quality functional mushroom tinctures use dual extraction.
See: Mushroom Tinctures
Ganoderma lucidum (Reishi)
Species
A woody, bracket fungus used extensively in traditional East Asian medicine and modern functional mushroom products. Reishi is associated with research into immune function, sleep quality, and stress response. It is one of the most widely studied medicinal mushrooms globally and is available in various supplement formats.
Hericium erinaceus (Lion's Mane)
Species
A distinctive, pom-pom-shaped edible mushroom with a seafood-like flavour when cooked. Lion’s Mane is among the most researched functional mushrooms, with scientific interest focused on its hericenone and erinacine compounds and their potential effects on nerve growth factor (NGF). Available from SporeBuddies as dried whole mushroom, liquid culture, and tincture.
See: Eating Lion’s Mane Mushrooms | Growing Lion’s Mane at Home UK
Tincture
Supplement
A concentrated liquid extract of a mushroom, typically prepared with alcohol, water, or a combination of both. Tinctures are a popular delivery format for functional mushroom compounds due to their bioavailability and ease of dosing. Quality varies based on whether dual extraction was used and the extraction ratio applied.
See: Mushroom Tinctures
Trametes versicolor (Turkey Tail)
Species
A common bracket mushroom found on dead wood throughout the UK. Turkey Tail is one of the most researched functional mushrooms globally, with substantial scientific interest in its polysaccharide-K (PSK) and polysaccharide-peptide (PSP) compounds. It is named for its fan-shaped, banded appearance, which resembles the tail feathers of a wild turkey.
🛡️ Contamination
Cobweb mould vs mycelium
Identification
Cobweb growth is one of the most common sources of confusion for beginners. Healthy mycelium is rope-like, white, and adheres firmly to substrate. Cobweb mould is thinner, more diffuse, and often grey or translucent, spreading loosely across the surface. Light misting can sometimes slow cobweb growth; persistent or unusual growth that does not respond should be treated as contamination.
See: Contamination in Cultivation | Grow Kits & Contamination FAQ
Grain mites
Pest
Microscopic arthropods that infest grain spawn and substrate. Grain mites are white, barely visible to the naked eye, and form a fine, powdery layer on affected grain. They thrive in warm, humid environments and spread rapidly. Infested bags should be removed from your grow space, sealed, and disposed of immediately to prevent spread.
Trichoderma
Contaminant
One of the most common and aggressive fungal contaminants in mushroom cultivation. Trichoderma appears as green or dark green patches on colonised substrate or grain. It outcompetes mushroom mycelium rapidly and spreads quickly once established. Contaminated bags should be removed and sealed immediately, handled away from your main grow area.
⚖️ Legal & Research Terms
The entries below are provided for educational and research context only. They are not legal advice. Always check current UK law before purchasing or possessing any restricted substance. SporeBuddies sells spores for microscopy research purposes only, in accordance with UK law.
Psilocybin
Compound
A naturally occurring psychoactive compound found in certain mushroom species. In UK law, fungi containing psilocin or an ester of psilocin are classified as Class A controlled substances under the Misuse of Drugs Act 1971 as amended by the Drugs Act 2005. Psilocybin is also a subject of structured clinical research at academic institutions including Imperial College London and Johns Hopkins University.
See the dedicated entry: Glossary: Psilocybin (Definition, Research Context & UK Legal Status)
Psilocybe cubensis
Species
A species within the genus Psilocybe, widely referenced in microscopy and spore research contexts. Psilocybe cubensis is among the most studied species in terms of spore morphology and strain diversity. Spores are sold by SporeBuddies for microscopy research purposes only, in accordance with UK law. Growing Psilocybe cubensis fruiting bodies in the UK is illegal.
Misuse of Drugs Act 1971
Legislation
The primary UK legislation governing the classification and control of drugs. Mushrooms and fungi containing psilocin or esters of psilocin are classified as Class A drugs under this Act, as amended by section 21 of the Drugs Act 2005. This applies to both fresh and dried forms of the fungus.
See: Laws, Safety & Compliance Hub | Magic Mushroom Laws in Europe
⚠️ Common Mistakes with Mycology Terminology
Understanding mycology terminology helps you avoid errors in both cultivation and communication. These are the most frequent misconceptions beginners encounter:
Confusing mycelium with contamination. Not all white growth is contamination, and not all discolouration is harmless. Learn the difference by consulting the contamination identification guide.
Using “spore” and “strain” interchangeably. Spores are biological cells; a strain is an informal label for a variety. Golden Teacher is a strain name, not a species name.
Calling all mushrooms “psilocybin mushrooms”. The vast majority of mushroom species contain no psilocybin whatsoever. Most functional and gourmet mushrooms are entirely unrelated to controlled substances.
Treating spawn and substrate as the same thing. Spawn colonises substrate. They are different materials used at different stages of the growing process.
Assuming liquid culture and spore syringe are identical. A spore syringe contains spores suspended in water; a liquid culture contains active, colonised mycelium. They behave differently at inoculation.
Conflating sterilisation and pasteurisation. Sterilisation eliminates all microbial life including heat-resistant endospores. Pasteurisation reduces harmful organisms without achieving complete sterility. Each method is appropriate for different substrate types.
Misuse of Drugs Act 1971
Legislation
The primary UK legislation governing the classification and control of drugs. Mushrooms and fungi containing psilocin or esters of psilocin are classified as Class A drugs under this Act, as amended by section 21 of the Drugs Act 2005. This applies to both fresh and dried forms of the fungus.
See: Laws, Safety & Compliance Hub | Magic Mushroom Laws in Europe
❓ Frequently Asked Questions
What is the difference between mycelium and a mushroom?
Mycelium is the vegetative, underground network of a fungus: the main body of the organism. A mushroom is the fruiting body that mycelium produces when environmental conditions trigger the reproductive cycle. The mushroom is temporary; mycelium is the persistent organism.
What does "inoculation" mean in mushroom growing?
Inoculation is the process of introducing spores or liquid culture into sterile substrate or grain to begin the colonisation process. It is the first active step in a grow and must be performed in a clean environment such as a still air box or flow hood.
What is the difference between sterilisation and pasteurisation?
Sterilisation eliminates all microbial life, including heat-resistant endospores, using a pressure cooker or autoclave. Pasteurisation uses lower heat to reduce harmful organisms without full sterility. Grain spawn must be sterilised; most bulk substrates are pasteurised. See: How to Pasteurise Mushroom Substrate.
Are mushroom spores legal in the UK?
Mushroom spores for microscopy and research purposes are legal to buy and possess in the UK. They become illegal if used to cultivate species containing controlled compounds. SporeBuddies sells spores for microscopy purposes only. Full guidance: UK Spore Legality Guide.
What are functional mushrooms?
Functional mushrooms are species valued for their bioactive compounds and associated wellness research, beyond basic nutrition. Lion’s Mane, Reishi, Cordyceps, and Turkey Tail are the most widely referenced. They are entirely distinct from psilocybin-containing species and are legal to grow, sell, and consume in the UK. See: Mushroom Health & Wellness Hub.
What is field capacity and how do I know when I have achieved it?
Field capacity is the ideal moisture level for prepared mushroom substrate. Squeeze a handful firmly: only a few drops should run from between your fingers. More than that means the substrate is too wet. None at all means it needs more water. See: Field Capacity Guide.
Related Guides
About This Guide
This glossary was produced by SporeBuddies, one of the UK’s leading suppliers of mushroom spores, grow kits, and mycology equipment. SporeBuddies has been supporting UK growers and researchers with high-quality, reliably produced products including double-density spore syringes, sterilised grain bags, and functional mushroom supplies.
All content is written to support accurate, practical mycology knowledge. Spore-related content reflects UK legal requirements, framing spore research strictly within microscopy and educational contexts. This glossary is for educational purposes only and does not constitute legal or medical advice.
Questions? Call us on 0800 069 9269 or visit the contact page.
Shop SporeBuddies
UK spore syringes, grow kits, and functional mushrooms, in stock now.
Individual Glossary Entries
Popular Grow Guides
Microscopy & Spores
Explore the SporeBuddies Range
Whether you are setting up your first substrate, studying spores under a microscope, or looking for functional mushroom tinctures and dried Lion’s Mane: SporeBuddies has everything you need, delivered fast across the UK.