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.

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)

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

Synonyms and Alternate Names:
Basidiodendron grandinioides (Bourdot & Galzin) Luck-Allen
Bourdotia grandinioides Bourdot & Galzin
Coniophora fulva Massee
Sebacina grandinioides (Bourdot & Galzin) D.P. Rogers
Tympanis pseudotsugae J.W. Groves