Summary:
Features include 1) growth on decayed wood, also mycorrhizal with orchids, and found on old shelf fungi and dead mosses, 2) a thin, waxy or waxy-gelatinous fruitbody that is pale neutral or pinkish gray, 3) very long narrow spores that are cylindric to fusiform, and straight, arcuate, sigmoid, or helicoid, usually with a distinct apical projection, 4) tulasnelloid basidia, spherical, and long-stemmed probasidia, with usually 4 epibasidia, and 5) hyphae without clamp connections.

Microscopic:
SPORES 15-52 x 3-4 microns, "cylindric, straight, arcuate, sigmoid or helicoid"; PROBASIDIA 12-20 x 8-14 microns, spherical, long-stemmed, "epibasidia usually four, occasionally more, finally ovate to oblong at base, produced into cylindric filament toward apex"; hyphae 3-6 microns wide, "mostly repent, sparsely branched", without clamp connections, (Martin), SPORES 19-24 x 4.4-5.3 microns, long-sinuous, smooth, inamyloid, colorless, contents homogeneous, thin-walled, with small apiculus; BASIDIA 4-spored, colorless, clavate when mature, sometimes stemmed, broadly ellipsoid when young, 14-27 x 10-13 microns, smooth, thin-walled, basal clamp connection absent, contents homogeneous, epibasidia broadly elliptic, about 12-13 x 8-9 microns, rather abruptly narrowed to subulate [awl-shaped], sometimes branched sterigmata (up to 11 x 3.5 microns); CYSTIDIA none; HYPHAE 3-6 microns wide, "loosely arranged in subhymenium and trama", cylindric, colorless, "branching from all parts of the hyphae", "thin-walled in the subhymenium, thin-walled to somewhat thick-walled in the trama", with smooth surface, clamp connections lacking, contents homogeneous, (Julich), SPORES 16-30 x 3.5-5(8) microns, "broadly to narrowly fusiform, usually with a distinct apical projection", (Roberts)

Notes:
Tulasnella calospora has been found in OR, AB, ON, IA, ME, NC, NH, and WI, (Ginns). It also occurs in HI, and Europe including France, (Martin). There are R. Bandoni collections from BC deposited at the University of British Columbia (as Gloeotulasnella calospora).