Jelly Baby Identification Guide

First impression and the ground you are standing on

You will most likely be crouching on a damp, mossy bank in broadleaved or mixed woodland — beside a stream, along a shaded path cutting, or on a north-facing slope thick with liverworts — some time from late summer through autumn.

What you notice is a small cluster of glossy, rubbery, ochre-yellow blobs on short stalks, two to six centimetres tall, sitting among moss. They catch the light because they are wet-looking even when the surrounding litter is dry, and they look moulded rather than grown: smooth, lobed, slightly translucent. Touch one and the impression is confirmed — cool, slippery and springy, closer to a piece of gel than to mushroom tissue.

They usually appear in small troops, occasionally in dense fused clusters where several fruit bodies grow from one point.

Reading the head

The upper part, the fertile head, is 0.5–2 cm across. It is convex, but never regularly so: the surface is irregularly lobed, wrinkled and folded, often with a shallow depression or a fold running across the top, so no two are quite alike.

The margin is the key structural feature. It is rolled or tucked under, so the head sits on the stipe like a slightly deflated cap with its edge curled inwards, and the boundary between head and stalk is a tucked seam rather than an open rim.

Colour is dull ochre, yellowish, olive-yellow or tan, sometimes brighter yellow in young material and darker olive when wet. The surface is entirely smooth and slimy — never wrinkled into radiating veins, never fibrous, never scaly.

The spore-bearing surface: the turn-over test

This is the step that decides the whole identification, and it takes two seconds.

Lift a fruit body and look underneath the head. There should be nothing there: no gills, no pores, no teeth, no wrinkles. The underside is simply a smooth, slightly paler continuation of the tissue running down onto the stalk.

That is because this is an ascomycete, not a gilled fungus. The fertile layer — the hymenium — coats the upper, convex, outer face of the head, where the spore-producing asci stand side by side in a smooth continuous sheet. Any specimen with plates, pores or spines underneath belongs somewhere else entirely, whatever its colour and texture.

Stipe and base

The stalk is 2–6 cm long and 3–8 mm thick. It is usually cylindrical but often becomes compressed, flattened or shallowly grooved along its length, and it may twist.

Its colour is dull yellow to ochre, generally a shade paler and duller than the head, and its surface is viscid and dotted with tiny granular scurf or squamules that are often greenish or olive-tinged — check this with a lens, because the granulation and its colour matter when separating close relatives. There is no ring, no volva, no bulb; the base simply narrows and disappears into moss and litter, often with pale mycelial threads binding soil particles.

Cutting the fruit body

Slice one lengthwise. The interior is gelatinous throughout — translucent, watery, yellowish, with a firmer gel core running up the middle of the stipe and continuing into the head. There is nothing fibrous, nothing chalky and nothing brittle about it.

Watch the cut face for a minute: there is no colour change on exposure. There is no latex, and no distinctive odour. The absence of reactions is itself informative — this is a species identified by structure and texture, not by chemistry.

Getting spores and reading them

You can attempt a print. Rest a fresh head, fertile face down, on a glass slide inside a covered container overnight in a humid atmosphere. Asci discharge forcibly, so a deposit does form, but it will be sparse and effectively colourless, so do not expect the informative coloured print of an agaric.

A squash mount of the fertile surface is far more productive. Scrape a sliver from the top of the head, mount it in water, and look for:

• Asci: long, cylindrical to narrowly club-shaped, each containing eight spores, and not turning blue in iodine.
• Spores: colourless, long and narrow, fusiform and usually slightly curved, roughly 17–26 by 4–6 micrometres, and developing several cross-walls at maturity — commonly three to seven septa in fully ripe material.
• Paraphyses: slender sterile threads among the asci, with slightly swollen or hooked tips, carrying olive-green pigment in green-tinted collections.

Substrate, season and ecology

Fruit bodies arise from soil, humus, leaf litter and moss, not from wood, though they may be found on very rotten buried debris. They favour damp, shaded, acid to neutral ground in both broadleaved and coniferous woodland, and are especially frequent on stream banks, ditch sides and eroded path edges where mineral soil is exposed.

The season runs from midsummer to late autumn, peaking after prolonged wet weather. The species is widespread across the Northern Hemisphere. Its ecology is not fully resolved: it behaves like a soil saprotroph but has been shown to associate closely with tree roots, so it is best regarded as a root-associated soil fungus rather than a pure litter decomposer.

Separating the look-alikes on morphology alone

Leotia viscosa has the same gelatinous build and a similar ochre to yellowish stalk, but the head is dark green to blackish-green, giving a sharp contrast between head and stipe. Leotia atrovirens is green throughout, head and stalk alike. Intermediates occur, so judge the contrast between the two parts rather than the head colour alone.

Cudonia confusa and C. circinans have a similar tucked-under head margin but are dry rather than slimy, paler tan to buff, with a slender non-gelatinous stalk and extremely long needle-like spores.

Spathularia flavida has a flattened, fan- or spatula-shaped head that runs down two sides of the stalk, and it is dry to the touch.

Mitrula paludosa grows in standing water and saturated litter in spring, and has a bright orange-yellow ovoid head sharply demarcated from a translucent pure white stalk.

Ascocoryne sarcoides and Neobulgaria pura are gelatinous but pink to purple, grow on wood, and are essentially stalkless.

Bulgaria inquinans forms black rubbery discs on fallen bark.

Small waxcaps and other agarics may match the size and the greasy feel, but they have true gills — the turn-over test settles it every time.