Stalked Scarlet Cup

The Stalked Scarlet Cup is the small, long-stalked member of Sarcoscypha and the only common one to fruit in the warm months. Where its larger relatives form broad bowls sitting almost directly on wood in late winter, this species produces a tiny bright red disc — often no bigger than a fingernail — perched on a thin, clean white stalk that lifts it clear of the substrate.

That combination of a small cup and a proportionally long, obvious stalk is diagnostic, and it makes the species look almost like a scattering of red-headed pins across a decaying stick. Colonies frequently number dozens of fruiting bodies along a single branch fragment.

It is a member of the Sarcoscyphaceae and is most familiar in eastern North America, where it is one of the standard finds of late spring and early summer walks along damp wooded stream banks.

Fruiting body

The cup is small, typically 0.5–2 cm across, shallowly bowl-shaped to nearly flat and disc-like at maturity, with a thin even margin that may become slightly wavy.

Surfaces

The inner surface is smooth and bright scarlet to orange-red. The outer surface is whitish to very pale pink and smooth or only faintly downy, with far less matting than in the Crimson Cup.

Stipe

Distinct and diagnostic: a slender whitish stalk 1–4 cm long and only a few millimetres thick, arising from decaying wood and holding the cup well above it. This clearly visible stem is the single most useful field character for the species.

Flesh & spore print

The flesh is thin, whitish and slightly pliant rather than brittle, with no exudate or colour change on cutting. The spore print is white; the spores are smooth and elliptical, notably smaller than those of the Crimson Cup.

It fruits on decaying hardwood — sticks, small branches, chunks of fallen limb and sometimes larger buried wood — in moist deciduous and mixed woodland. Sheltered stream banks, floodplain forest, shaded ravines and damp bottomland are typical sites, and the wood is usually already well rotted and in contact with the ground.

Unlike other members of the genus, its season runs from late spring through summer, roughly May to August in temperate regions, following warm rains. It is common in eastern and central North America and is recorded more sparsely elsewhere.

The Stalked Scarlet Cup is a saprophyte of hardwood, its mycelium decaying the cellulose and lignin of small-diameter branches lying in humid conditions. Colonised sticks are typically soft, damp and darkened, and a single piece of wood may support fruiting over several weeks.

Raising the spore-bearing disc on a thin stalk is a functional adaptation: it places the asci above the boundary layer of still, humid air trapped at the surface of the wood and leaf litter, improving the chance that ejected spores are caught by moving air. Fruiting in summer also separates it in time from its cold-season relatives, reducing direct competition for the same substrate.

The Crimson Cup (Sarcoscypha coccinea) and its relatives S. austriaca and S. dudleyi are all considerably larger, with cups commonly 2–5 cm across, a densely downy whitish outer surface, at most a short stubby stalk, and a late-winter to spring season — the opposite end of the year.

Microstoma floccosum is also small and red but forms a deeper goblet fringed with long shaggy white hairs. Scutellinia species (eyelash cups) are small orange-red discs but sit flat on the substrate with no stalk and carry a rim of stiff dark eyelash-like hairs. Tiny orange Bisporella discs on wood are yellow-orange rather than scarlet, cushion-like, and lack any real stalk.