Summary:
Features include 1) resupinate growth on decayed conifer wood, 2) a fruitbody that is waxy, visible as an inconspicuous bloom on the wood, 3) spores that are nearly round, smooth, inamyloid, and acyanophilic, 4) microscopic features (characterizing the genus) of the basidium which forms perpendicularly from the sparse basal hyphae by "internal repetition" from a previous basidium, forming a stem that has no septa but has clamp connections and other traces from previous basidia at intervals, and 5) capitate cystidia bearing a granular droplet.
Repetobasidium mirificum has been found in BC, NM, and PQ, (Ginns). It has also been found in Finland, Germany, Norway, Sweden, and the USSR, (Eriksson).
Fruiting body:
resupinate, very thin, in the living state ceraceous [waxy], when dried grayish to pale yellowish, porulose [with fine pores], not continuous under lens; margin not differentiated, (Eriksson)
Microscopic:
SPORES 5-7 x 4.5-5.5 microns, nearly round, smooth, inamyloid, acyanophilic, thin-walled; BASIDIA 4-spored, (8)10-13 x (5)7-8 microns, subglobose-pyriform, with basal clamp connection; CYSTIDIA 30-45 x 5-7 microns, capitate, with apical round drop about 10 microns wide, granular, at first colorless, drying to amber or yellow-red, visible under lens also in herbarium; HYPHAE monomitic: hyphae 2-3(4) microns wide, the basal ones close to the wood with perpendicular basidial branches, basal hyphae not gelatinous, (Eriksson)
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