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Species Information
Summary: Features include 1) resupinate growth on wood and other substrates, 2) a fruitbody that is a thin gray layer, waxy-pruinose when fresh, 3) spores that are smooth, inamyloid, and oval to elliptic, germinating by repetition, 4) 4-spored, roundish basidia with large sterigmata, and 5) a monomitic hyphal system without clamp connections.
Ceratobasidium cornigerum has been found in OR, AB, ON, CO, IA, IL, NY, and OH, (Ginns). It has also been found in Europe and the Marshall Islands, (Martin). There are collections from BC deposited at University of British Columbia by R. Bandoni.
Fruiting body: effused, tenuous, margin indefinite; "gull-gray"(R) to "pale gull-gray"(R), when dry silvery gray; when fresh waxy-pruinose, when dry forming a closely adherent encrustation or bloom, under hand lens minutely poroid to minutely floccose, (Martin), very thin, when fresh smooth ceraceous [waxy], when dry appears like a grayish bloom, (Eriksson), spore deposit white (Buczacki)
Microscopic: SPORES 7-11.5 x 3.5-6 microns, narrowly oval to elliptic, smooth, inamyloid, spore repetition occurs laterally; BASIDIA 4-spored, 12-16 x 7-10 microns, sterigmata 10-15 microns long; CYSTIDIA none; HYPHAE monomitic, BASAL HYPHAE about 5 microns wide, with somewhat thickened walls, straight, sparsely branched at right angles, no clamp connections, hymenial branches more narrow, thin-walled and richly branched especially in old hymenia, no clamp connections, "finally forming a pseudoparenchymatous structure", (Eriksson), SPORES (6.5)7.5-9.5 x 4-6 microns, "broadly fusiform in one aspect, asymmetrical, oblong-ellipsoid, obliquely attenuate in the other", germinating by repetition; BASIDIA 12-14 x 7.5-9(11) microns, "terminal or lateral on the supporting hyphae, ovate or pyriform", "bearing on the end or on the outer side four stout epibasidia, straight or somewhat curved or divergent, sometimes inflated just above the base", 9-12(14) x 2-3 microns; hyphae (3)5-6(7.5) microns wide, "colorless, without clamps, mostly repent, branching at right angles", (Martin)
Habitat / Range
on bark and wood, decayed wood, mycorrhizal with exotic and native orchids, hosts include Coeloglossum (an orchid genus), Platanthera obtusata (blunt-leaf orchid), Rhus glabra (smooth sumac), Quercus gambelii. (Gambel Oak), Salix sp. (willow), Ulmus sp. (elm), (Ginns), on different kinds of substrate, but preferably newly fallen branches of conifers and hardwoods with still fresh bark, seeming to be most common on twigs of Pinus (pine) and Picea (spruce) fallen to the ground, (Eriksson), on a wide range of organic substrates including leaf litter, rotting hardwood, old fern fronds, living leaves, and soil; all year, (Buczacki)
