Summary:
Features include 1) small, smooth, milky to greenish discs or tubercles erumpent from the cavities of pyrenomycete fungi on wood, sometimes confluent up to 1cm across, and 2) microscopic characters.

Microscopic:
spores (7) 9-12 x 7.5-11 microns, globose to bulliform, the apiculus large, blunt, germinating by repetition; probasidia often in clusters formed by proliferation through the basal clamp connection, the individuals initially subcylindric, rounded in upper part and tapering into a stalk-like base, (10.5)12-18 (21) microns in diameter, the length including stalk 18-45 microns, mostly 4-celled, the septa oblique to irregular; hymenium diffuse, the basidia most compact near the exposed surface, but also scattered well into the interior of the fruitbody; hyphae radiating outward from the base, compactly interwoven, 1.5-4 microns wide, with clamp connections, branching from clamp areas, haustorial branches present, scattered, a partially degraded perithecium (? Diaporthe sp.?) often present in the basal region, (Bandoni), spores 9-12 x 7.5-11 microns, elliptic or nearly round; basidia "obovate to clavate to stalked-ovate, subtended by clamp connections", 18-27 x 12-15 microns, becoming 2-4-celled by the formation of longitudinal to oblique septa, epibasidia 2.5-3.2 microns wide; hyphae 2.5-3 microns wide, thin-walled, smooth; clamp connections not seen, (Klett), spores mostly 7-9 x 7.5-9.5, nearly round to round, frequently wider than long, (Chen, C.-J.)

Notes:
There are collections from BC at the University of British Columbia.

Synonyms and Alternate Names:
Peniophora serialis (Fr.) Hoehn. & Litsch.
Thelephora serialis Fr.