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Species Information
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.
There are collections from BC at the University of British Columbia.
Fruiting body: 0.1-0.6cm in diameter, about half as high, but protruding only slightly, often anastomosing, then larger and form elongate to irregular; erumpent, disciform to tuberculate, typically only slightly convex, the margin surrounded by the upturned substrate epidermis, in section extending into the inner bark; gelatinous drying horny, repeatedly reviving when wet but showing little increase in external dimensions; milky to greenish, drying black; the upper surface smooth, (Bandoni), small tubercles erumpent from the cavities of Pyrenomycetous fungi, 0.1-0.2cm in diameter, may become confluent up to 1cm; greenish olive, drying blackish; consistency soft-gelatinous, (Klett)
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.)
Habitat / Range
several of the UBC collections are on Cytisus scoparius (broom)
Similar Species
Tremella atrovirens has been thought of as included in Tremella exigua, but is different: it occurs on barberry, (R. Bandoni, pers. comm.). T. atrovirens not known to occur in the Pacific Northwest.
