Summary:
Features include 1) resupinate growth on conifer wood, 2) a fruitbody that is white to cream and forms a waxy film or appears like hoar frost on the substrate, with a meager subiculum, 3) spores that are round or nearly so, closely spiny, and inamyloid, 4) numerous gloeocystidia that are cylindric, sometimes with one or two projections, and 5) some hyphae 2-2.5 microns wide with clamp connections, the cells often irregularly inflated.

Microscopic:
SPORES 4.5-6.5 microns in diameter including the markings, globoid [round or nearly so], "walls closely echinulate, slightly thickened, markings in optical section giving the appearance of a band 0.5-.75 microns broad surrounding the spore wall", inamyloid, with prominent basal apiculus; BASIDIA 4-spored, 13-16 x 6-6.5 microns, cylindric or clavate, "sometimes formed directly from hyphal cells and then bifurcate at base", sterigmata 5-6 microns long, slender, divergent; GLOEOCYSTIDIA numerous, 20-60 x 5.5-6 microns, irregular, for the most part cylindric, "apex occasionally with one or rarely two narrow cylindric projections to 6 microns long", base sometimes bifurcate; some HYPHAE 2-2.5 microns wide with clamp connections, "cells often irregularly inflated, soon collapsing", (Jackson), SPORES 5.5-7.5 microns, round, with rounded warts; BASIDIA 4-spored, 25-35 x 6-7 microns, in most cases lateral, rarely terminal, usually with a weak constriction; CYSTIDIA or gloeocystidia-like organs, 40-60 x 6-10 microns, tubular or in some cases more or less subulate [awl-shaped], sometimes with 1-3 apical protuberances, sulfo-negative, (Hjortstam)

Notes:
Phlebiella inopinata has been found in BC and ON (Ginns). The holotype is from ON.

Synonyms and Alternate Names:
Caldesiella calcicola (Bourdot & Galzin) M.P. Christ.
Caldesiella ferruginosa var. calcicola Bourdot & Galzin