Decomposers / saprotrophs
Many fungi break dead organic material into forms that can move again through soil, plants and other organisms. Decay becomes continuity rather than disappearance.
Chamber · Field atlas
The Mycelial Network.
A woodland field station, a fungal museum drawer, and a living forest floor. From a mushroom in the hand to a better observation: habitat, role, characters, and the limits of a photograph.
Identify to learn. Not to eat.
— field-atlas specimens
Britain and Ireland
No edibility verdicts
Open by letter
Connection before spectacle
Most of the organism is out of sight.
A mushroom is often only the fruiting structure of a much larger fungal organism. Mycelial threads move through soil, wood and other material, helping decompose, recycle and exchange.
This chamber is not an edible-mushroom shortcut. Look first at habitat, substrate, season and structure. Keep facts, uncertainty and metaphor in separate rooms.
Life, simplified
How a fungus lives.
This flow is a teaching sketch. Timing and form vary widely between fungal groups.
- 01
Spore
A reproductive cell that can travel on air, water, animals or disturbance.
- 02
Germination
If conditions allow, the spore begins to grow rather than remaining dormant.
- 03
Hyphae
Fine filaments that explore a substrate and digest what they can use.
- 04
Mycelium
The living network of hyphae. This is usually the main body of the fungus.
- 05
Fruiting body
The visible mushroom, bracket, crust or similar structure that can release spores.
- 06
Spore release
New spores leave. The mycelium may continue unseen.
- Mycelium
- The networked body of hyphae in soil, wood or another substrate.
- Hyphae
- The individual filaments that make up mycelium.
- Fruiting body
- The reproductive structure people usually notice and photograph.
- Spores
- Reproductive cells. They are not seeds, and most never establish.
- Substrate
- The material the fungus is growing in or on: soil, wood, litter, dung or a living host.
A living pattern
What fungi do in an ecosystem.
Roles overlap. One species may change relationship over time. Forests are not one conscious wood-wide web, and not every fungal link helps every tree.
Mycorrhizal partners
Some fungi form interfaces with plant roots. Carbon, water and minerals can move across that partnership. The exchange is real; it is not a guarantee of benefit to every plant in a stand.
Parasites / pathogens
Some fungi live at a host’s expense or exploit weakness. That can damage a tree or plant, and it can also open space for later species.
Endophytes / quieter associations
Other fungi live inside plant tissues with effects that are still being mapped: sometimes neutral, sometimes protective, sometimes costly depending on context.
Read the place first
Habitat before a name.
One feature is never enough for safe identification. Do not taste unknown fungi.
Substrate
Soil, living wood, dead wood, leaf litter, dung or buried roots.
Company
Nearby trees and plants. Association can support a guess. It never proves identity.
Woodland and soil
Woodland type, leaf litter, moisture and recent weather all change what fruits.
Season and grouping
Date, solitary or clustered, ring or troop. Calendar is a hint, not a key.
Cap
Shape, colour, texture, margin and how those change with age.
Underside
Gills, pores, teeth, folds or a smooth surface. Look without stripping the site.
Stem and base
Whole stem, ring or veil remnants, and the base. A volva, where present, matters.
Change
Bruising, colour shift, texture and an optional spore print. A single photograph is incomplete.
Britain and Ireland, broadly
Seasons in the network.
Species and weather matter more than the calendar. These are observation notes, not a fruiting guarantee.
Spring
Return of moisture
Early fruiting, morels and saddles on some soils, and wood-inhabiting fungi after winter wet. Look at stumps, standing deadwood and shaded banks.
Summer
Heat, shade, flush
Dry spells suppress many fruiting bodies. Rain and cool microclimates can bring sudden flushes.
Autumn
Main fruiting
For many woodland species this is the most visible season. Still photograph habitat, not only the cap.
Winter
What persists
Brackets, crusts, jellies and tough fruiting bodies remain. Decomposition continues below the quiet surface.
Company
Trees and fungal company.
Some fungi show strong host habits. Others are generalists. A nearby oak never proves the name of the mushroom at its feet. Association is evidence, not proof.
Oak
Long-lived woodland structure with a wide fungal company, including mycorrhizal boletes and wood-decay brackets such as beefsteak fungus and chicken of the woods.
Beech
Dense shade and mast years shape litter and fruiting. Porcelain fungus is a strong beech associate. Association is a clue, not a verdict.
Birch
Often an early companion on poorer or disturbed ground, including much of northern England. Birch polypore, brown birch bolete and woolly milkcap prefer birch, and several fungi do not.
Pine and spruce
Conifer stands carry their own mycorrhizal and decay communities. Needle litter is a different substrate from broadleaf mull. Slippery jack and saffron milkcap are pine-side examples.
Larch
Another conifer host, sometimes sharing Suillus and other plantation fungi with pine. Host is still only one character.
Willow
Wet ground and river edges. Moisture and disturbance can matter as much as the tree itself. Blushing bracket is a frequent waterside companion.
Hazel
Understorey and coppice structure. Look at the whole stand, not a single stem. Dead attached twigs often carry jellies and crusts.
Alder
Wet woods and stream sides. Alder has its own mycorrhizal company. Do not transfer an oak name to an alder root by habit.
Closer to home
The network in the garden.
Visible mushrooms are not automatically disease. Fungi are not always beneficial. No-dig is not always best.
Litter, mulch, compost
Leaving some leaf litter and woody material supports decay communities. Compost is a managed version of the same work. Woodchip can carry its own visitors, including introduced stinkhorns.
Deadwood and soil
Where it is safe and permitted, leaving some deadwood helps habitat. Avoid unnecessary soil disturbance when the ground is already working.
When to look closer
Fungal growth on living plants, stored food or building timber may need investigation. Honey fungus is a real plant-health issue. Reduce unnecessary fungicide use; do not ignore structural or plant-health problems.
UK field atlas
A drawer of specimens, built to be searched.
Search by name, host, habitat or caution. Filter by visible form, ecological role, substrate, season or tree company. Higher-caution specimens stay labelled. This is not a poison garden, and it is not a menu.
Opening the atlas…
Before you name it
Take better identification photos.
A single cap from above is rarely enough. Photograph the place, then the parts. Where lawful and appropriate, document the base carefully. If collecting is not appropriate, leave it in place.
Whole specimen in habitat
Show how it sits in the place: soil, wood, litter, moss.
Cap / upper surface
Shape, colour, texture, scales, warts and the margin.
Underside
Gills, pores, teeth, folds or a smooth surface.
Full stem
Length, texture, ring or veil remnants, colour change.
Stem base
Without cutting it off. A buried volva is easy to miss and expensive to ignore.
Nearby substrate
The wood, soil, dung, mulch or litter it is actually using.
Nearby trees and plants
Company is evidence. It is not a proof.
Several ages
If they are naturally present. Do not uproot rare fungi to complete a set.
Honesty about photographs
Can I identify this from a photo?
Sometimes a picture narrows the field. Often it does not. This atlas refuses to pretend otherwise.
Sometimes a good candidate
Distinctive macro-features may narrow the field.
A typical fly agaric, a hoof on birch, or a mature stinkhorn can be a strong candidate. Candidate is not certainty, and it is never an edibility verdict.
Often not enough
Many species require several features.
White gilled mushrooms, brown boletes, and garden Agaricus usually need stem, base, habitat and more than one photograph.
Sometimes impossible without microscopy
Some groups are not reliably separable from photos.
Little brown mushrooms on wood, many russulas, and several crusts need microscopic characters. The atlas says so on those cards.
Sometimes DNA or specialist work
Modern taxonomy can exceed normal field identification.
Honey fungus, chicken of the woods, morels and some brackets are complexes. A familiar name can hide more than one species.
Local only
A field note builder.
Collect a better observation before using Shroom ID or another field guide. Nothing typed here is stored by ARC or sent anywhere. There is no automatic identification from these fields.
Identification
What a careful ID needs.
AI can organise notes and suggest candidate groups. It must not decide whether a wild mushroom is safe to eat.
What good evidence includes
Multiple photos of cap, underside, stem, stem base and habitat, plus substrate, region, date or season, nearby trees and specimen age.
What AI can help with
Sorting observations, suggesting candidate groups, explaining terms, comparing visible features and asking for missing evidence.
What AI must not decide
Edibility, whether poisonous look-alikes are excluded, or whether anyone should consume a specimen.
External identifier
Shroom ID
A third-party AI identifier is embedded below. Use the field note builder first if you can. ARC does not certify the result, and a name is not an edibility verdict.
Using the Mushroom Identifier sends the image and information to that external service. Photos submitted inside the tool are processed under the provider’s own terms. ARC does not control image retention or the provider’s model behaviour. The service does not currently publish a privacy policy at a stable public URL.
Loading the identifier. If the frame stays blank, use the full-page link. On a small screen, scroll inside the frame to the upload control.
Field practice
A mycelial walk.
A local checklist. Copy or save it if you want a record. Nothing here is stored by ARC.
Reflection prompt: what is supporting this place that I cannot immediately see? This is observation, not treatment.
Optional and quiet
Five small practices.
No voiceover. No autoplay. No medical claim. Nothing here is required.
Quiet breathing outdoors
Three to six comfortable breaths with a slightly longer exhale if that feels easy. No breath holds. No forcing.
Grounding scan
Notice feet, temperature, texture, sound and contact with the place you are in.
Interconnection notice
Name one visible ecological relationship: shade, decay, moisture, a host tree, litter.
60-second reset
Stop extra input for one minute and watch what the environment is already doing.
Mycelial walk
Use the fuller practice above when you have a path and a little time.
Access and conservation
Rules depend on the place.
This is a short orientation, not a legal briefing. Do not assume you can collect mushrooms anywhere for personal use.
Permission and land
Collecting rules can depend on land ownership, permission, site designation and species protection. Public access is not the same as a right to take fungi.
Protected sites
Sites of Special Scientific Interest, national nature reserves and other designated land can have additional restrictions. Local byelaws and site notices take priority over a website.
Commercial collection
Commercial gathering can be treated differently from casual observation. Do not scale a walk into a harvest.
Conservation-sensitive fungi
Some fungi, including many waxcaps of unimproved grassland, are conservation-sensitive. Photograph and leave them. Do not strip a patch.
Keep the rooms separate
Science, uncertainty, metaphor.
Metaphor is not scientific proof. Forests do not share a single mind, and mycelium is not a conscious internet.
Science
Observable fungal biology and ecology: hyphae, fruiting bodies, decay, partnership, parasitism and lichen partnerships can be studied in the field and the lab.
Uncertainty
Network dynamics, signalling, exchange rates, species limits and what a photograph can settle remain active research. This atlas names that limit on the card.
Metaphor
Mycelium as an ARC image for connection, decentralisation, resilience and hidden support. Useful as language. Not evidence.
Field ethics
Leave the system able to continue.
Follow local access and conservation rules. This is not a legal briefing.
- Photograph before collecting.
- Minimise disturbance and do not strip a patch.
- Respect protected sites and access agreements.
- Leave rare or unknown specimens where found unless you have a clear, permitted reason.
- Record habitat. The place is part of the observation.
Learn further
Verified starting points.
These organisations publish primary collections, field communities or woodland-ecology research. Read them on their own terms. Specimen cards cite Wikipedia, NBN Atlas and First Nature where those pages exist, plus specialist sources where needed.