Fuzzy Foot Identification Guide

The First Impression

Fuzzy Foot rarely announces itself as an individual mushroom. What you notice is a colour event: a rotten conifer log carpeted in moss suddenly wearing a shimmer of orange, as if someone had scattered a handful of tiny apricot buttons across the green. Get close and the swarm resolves into dozens, often hundreds, of caps under two centimetres across, each on a hair-thin stem, packed so densely that the stems interlace.

That gregarious swarming habit on well-rotted conifer wood is the strongest single field impression, and it is worth registering before you touch anything. Xeromphalina campanella does not grow in ones and twos on soil; it carpets wood. Note also that the mushrooms are tough and elastic rather than fragile, so a cluster can be lifted intact and the stems will spring back rather than shatter.

Reading the Cap

Caps measure half a centimetre to about two and a half centimetres. Young ones are convex or bell-shaped, but almost immediately the centre depresses to form a shallow navel, and mature caps are flat to broadly funnel-shaped with a distinct central dimple. The margin is thin, often incurved when young, and becomes wavy or shallowly lobed with age.

Colour is warm: tawny to bright orange-brown, usually deepest in the depressed centre and paling to yellow-orange or ochre-yellow at the rim. The surface is bald, dry to slightly greasy in wet weather, and strongly hygrophanous. When damp, the cap is translucent-striate and finely grooved along the lines of the gills, so the whole disc looks pleated when backlit. As it dries the striations fade and the colour shifts toward dull ochre-buff. Hold a cap up against the light to check the striation before deciding it is absent.

The Gills

Turn a cap over with a fingertip. The gills are pale yellow to orange-buff, paler than the cap, and they run noticeably down the stem, which is what gives the mushroom its little funnel-and-navel profile. Spacing is distant to subdistant, and short gills of two or three lengths are interleaved between the full ones.

The character that seals the genus is the veining. Between adjacent gills, low ridges and cross-connections run across the underside so that the spaces are partly bridged. With a hand lens this looks like a shallow lattice or netting between the plates, most obvious near the stem. Cross-veined decurrent gills on a tiny orange wood mushroom is a very restrictive combination.

The Stipe and the Fuzzy Foot Itself

The stem is one to four centimetres long and only one to two millimetres thick: wiry, tough, cartilaginous, often curved or bent so the caps orient toward the light. It is smooth and shiny, sometimes minutely mealy at the very apex, and it shows a clear colour gradient. The apex is yellow to orange, matching the gills, and the colour deepens down the stem to rich reddish-brown, chestnut or almost blackish-brown at the base.

At the very bottom sits the feature the common name records: a dense tuft of coarse tawny to rusty-orange hairs, forming a small brush or beard where the stem meets the wood. In a crowded swarm these tufts merge into a felted orange mat that binds many stems together. Tease one stem out with tweezers and look at the base with a lens; the hair tuft is present on essentially every fruit body and is one of the easiest confirmations available in the field.

Flesh and Colour Change

There is very little flesh to examine. The cap flesh is thin, pliant and yellowish; the stem flesh is tougher and brownish, with a fibrous core. Neither changes colour when cut or bruised, and no latex is exuded. Odour is negligible to faintly earthy. If a small orange mushroom on wood exudes milk, stains blue-green, or has a strong distinctive smell, it is something else.

Taking a Spore Print

The caps are small, so make the print from several at once. Cut half a dozen stems flush and arrange the caps gill-down on a piece of white paper, cover them with a jar, and leave them for six to twelve hours in a cool place. A scrap of damp tissue under the cover keeps the caps from drying out and quitting.

The deposit is white to very pale buff, which immediately separates the species from all the rusty-spored brown mushrooms that share the same rotten-log habitat. Under a microscope the spores are small, smooth and ellipsoid, roughly five to seven by three microns, and they stain blue-grey in Melzer's reagent, that is, they are amyloid. The gills carry abundant cystidia with irregular finger-like projections at the tip.

Substrate, Season and Ecology

This is a decomposer of well-rotted conifer wood, and the preference is strong. Spruce, hemlock, fir and pine logs and stumps in a soft, damp, moss-covered condition are the productive substrates, particularly wood that has passed the bark-shedding stage and become spongy. Fruiting spans late spring to late autumn, following rainfall, and the same log will produce repeated flushes over several seasons until the wood is exhausted. Dried fruit bodies can rehydrate and look fresh again after rain, which is a useful hint at the tough, marasmioid construction of the whole mushroom.

Separating It From Look-Alikes on Morphology Alone

Xeromphalina kauffmanii is the nearest twin. It also swarms on rotting wood with the same navel cap and hairy stem base, but it favours hardwood logs, particularly beech and maple, and its colours run duller yellow-brown rather than bright tawny-orange. Habit and colour tone plus substrate carry the separation.

Xeromphalina cauticinalis and its relatives grow scattered on conifer needle duff and litter rather than swarming on logs, have proportionally longer, more slender stems, and lack the dense caespitose massing.

Mycena species overlap in size but differ in construction: their stems are brittle and snap cleanly rather than being wiry and elastic, their gills are attached or notched rather than clearly decurrent, cross-veining between gills is usually absent, and the stem base bears fine white hairs or a small disc rather than a tawny brush.

Rickenella fibula grows in living moss on soil rather than on wood, is more slender, has a pale yellow-orange stem without a dark base or hair tuft, and lacks amyloid spores. Galerina and Pholiota species that share the same logs are ruled out by their rusty to brown spore prints and their brown gills. Chrysomphalina and Contumyces relatives lack the dark hairy stem base. Finally, any tiny orange cap growing on soil, needles or moss rather than clearly on wood should push you back through this list.

Field Checklist

Well-rotted mossy conifer log; hundreds of fruit bodies at once; cap under two and a half centimetres, orange-brown, navel-depressed, translucent-striate when moist; gills decurrent, pale yellow-orange, connected by cross-veins; stem wiry and tough, yellow above and dark reddish-brown below; base with a conspicuous tuft of tawny hairs; white spore print with small amyloid spores.