E-Flora BC: Electronic Atlas of the Flora of British Columbia

Summary:
Features include 1) resupinate growth on dead hardwood, 2) a fleshy pale yellow-brown fruitbody, under a hand lens appearing porose-reticulate, powdery, granular, and tuberculate, often pulling away in areas leaving knots of tissue connected by radiating strands, 3) spores that are short-elliptic, with the shortest axis often through the minute apiculus, germinating by repetition, 4) fertile hyphae with 2-3 basidia clustered at the end and many collapsed basidia sheathing the sides, each new basidia splitting longitudinally into 2 to 4 cells, and 5) gloeocystidia that are subfusiform, filled with yellow, often fragmented contents. The description given here is derived from that of Martin for Sebacina grandinioides (Bourdot & Galzin) D.P. Rogers, and that of Luck-Allen for Basidiodendron grandinioides (Bourdot & Galzin) Luck-Allen, both given by Ginns(5) as synonyms of this species.

Basidiodendron fulvum has been found in BC, OR, ON, AZ, FL, and NJ, (Ginns). It has also been found in Belize and France, (Martin).

Fruiting body:
pulverulent (powdery), under a hand lens appearing porose-reticulate, "the strands radiating from and connecting blunt granular columns 40-100 microns in diameter"; drying warm buff to cinnamon-buff, (Martin), "broadly effused, thin, adnate, fleshy", 0.0035cm in section; isabella color (Ridgway) when fresh; "drying continuous or interrupted, reticulate, tuberculate, granular, often pulling away in areas leaving knots of tissue connected by radiating strands", "becoming occasionally finely reticulate", (Luck-Allen)

Microscopic:
SPORES 3.5-4 x 3 microns, elliptic, "with the shortest axis often through the minute apiculus"; PROBASIDIA 6-8 x 4.5-5(6) microns, nearly spherical to suburniform, "becoming longitudinally, often indistinctly septate", epibasidia "at first divergent, finally incurved, subulate, about 3 microns long"; strands of porose reticulate surface "radiating from and connecting blunt granular columns 40-100 microns in diameter", "columns composed of erect axes of parallel hyphae from which gloeocystidia and fertile hyphae arise radially", GLOEOCYSTIDIA 30-50 x 4.5-6(8) microns, "slender, subfusiform, ventricose, somewhat flexuous, blunt, filled with yellow, often fragmented contents", the fertile hyphae 1.5-2 microns wide, "forming tortuous columns surrounded by sheaths of evacuated, collapsed basidia and bearing clusters of 2-3 young basidia at the apices", (Martin), SPORES 3 x 2.5-3 microns, nearly round to oval, apiculate, germinating by repetition; PROBASIDIA 5-9 x 4.5-7.5 microns, nearly spherical or pyriform, in clusters of two or three (rarely four), borne at apices of fertile branches, basidia 2-4-celled, typically 4-celled, 6-9(10) x 5-7(8) microns, urniform, "sterigmata at first divergent becoming arcuate, subulate", 3-7 microns long; fertile axis 18-40 x 1.5-2 microns, tortuous, "with dense involucres of collapsed basidia"; GLOEOCYSTIDIA 25-50 x 3-7.5 microns, at first homogeneous, colorless, "later becoming brownish, with globular or fragmented contents", cylindric or more commonly enlarged at base, narrowing and tortuous toward apex, "originating from a basal layer but often arising from fertile branches and projecting into the hymenium"; "central axis composed of fungal tissue growing up through hydnoid projections and radiating outward; new hymenium growing outwardly brought about by extensive proliferation with increasing thickness", (Luck-Allen)