Summary:
Features include 1) resupinate growth on decayed wood and bark, 2) a somewhat waxy fruitbody that is gray or bluish gray to light buff, under a lens appearing waxy-pruinose, 3) spores that are elliptic to suballantoid, smooth, weakly amyloid, and colorless, 4) basidia with the base often bifurcate, and 5) hyphae that are nodulose with clamp connections.
Amyloxenasma rallum has been found in BC, OR, ON, IA, MA, NY, and RI, (Ginns).
Fruiting body:
thin (in section 0.002-0.006cm thick), effused [spread out], closely adnate [firmly attached], subceraceous [somewhat waxy]; gray or bluish gray to light buff; under a lens appearing waxy-pruinose, (Liberta), thin, widely effused, adnate, subceraceous; grayish or bluish gray; waxy pruinose, (Jackson)
Microscopic:
SPORES 5-6.5 x 2-3.5 microns, elliptic and laterally depressed to suballantoid or allantoid, smooth, weakly amyloid, colorless; BASIDIA 4-spored, 7.5-16(24) x 4-5(6) microns, cylindric to subclavate, the base bifurcate, often obscure, sterigmata 4-7.5 microns long, subulate [awl-shaped], erect; SUBICULUM "either inconspicuous and giving rise to short, upright, nodulose hyphae, or rather thick and composed of hyphae parallel to the substratum, nodose-septate, 1-2.5 microns in diam, conglutinate or the walls becoming gelatinized", (Liberta), SPORES 5.5-6.5 x 2.5-3.5 microns, elliptic, "straight or more commonly depressed on one side, suballantoid, rounded above and below", smooth, weakly amyloid, thin-walled; BASIDIA 4-spored, 10-16 x 4-5 microns, clavate or subcylindric, "often bifurcate or inflated at one side", sterigmata 4-5.5 microns long, slender, erect; SUBHYMENIUM composed of hyphae 1.5-2.5 microns wide, intertwined, nodulose, thin-walled, with clamp connections; SUBICULUM "obscure below", (Jackson)
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