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Species Information
Summary: Resupinatus urceolatus features 1) gregarious, grayish, spherical to vase-shaped fruiting bodies 0.03-0.15cm in diam, externally farinaceous with short, incrusted hairs, 2) underlying subiculum sparse and wispy or lacking, and 3) round to nearly round spores 4.5-6 microns in diam.
Resupinatus urceolatus has been recorded from BC, (combining Thorn(4) with Redhead(21)), likely occurs elsewhere in North America, and is also found in Europe including Switzerland (Breitenbach) and South Africa (Cooke).
Upper surface: fruitbody about 0.03cm in diameter, spherical, urceolate [small mouth in relation to body], inner surface (with the spore bearing surface) gray, smooth; margin finely floccose-fringed, (Breitenbach), 0.03-0.15cm when dry, "discoid, becoming flattened, with inrolled margin when dry", spore-bearing surface olivaceous to cinereous or black-brown, (Cooke)
Underside: gray-brown; smooth, "incrusted with fine whitish material, with hyphae attached to it toward the base", (Breitenbach), composed of grayish-white meal "consisting of crystals enmeshed among surface hyphae", (Cooke)
Stem: up to dozens +/- crowded and stalkless on open-textured, light-colored subiculum, (Breitenbach), cups gregarious, often touching one another, sessile to subsessile [without a stem or almost without a stem], (Cooke)
Microscopic: spores 4.5-5.5 microns, round, smooth, inamyloid, colorless, with droplets [one in the illustration]; basidia 2-4-spored, 25-30 x 6-8.5 microns, clavate, with basal clamp connection; cystidia not seen; hyphal system monomitic, hyphae in the wall of the cups 1-5-2.5 microns across, brownish, thin-walled, in part slightly gelatinized, with clamp connections, hyphae in margin "branched like dendrophyses to drawn out into a beak and ventricose", (Breitenbach), spores 5.5-7 microns in diameter, round to nearly round, "smooth, granular inside, appearing minutely punctate, yellowish"; basidia 4-spored, 15-20 x 6-8 microns, in tight palisade, clamped at base; cystidia absent; hyphae 1.5-3 microns wide, colorless to yellowish, with simple septa, simple clamp connections, and medallion clamp connections, subgelatinous 1.4-1.8 microns wide in subhymenial area, (Cooke)
Habitat / Range
on dead hardwood, (Breitenbach), on rotting wood (Cooke)
Similar Species
Resupinatus poriaeformis has fruitbodies seated in a distinct, white to grayish, felty to membranous subiculum, resembling a crustose lichen (Stigmatolemma poriaeforme is a synonymous name which had been applied to Cooke''s 1957 BC collection of Resupinatus urceolatus), (Thorn(4)).
