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Family: TremellaceaeGenus: Tremella
Anamorph: not known.
Teleomorph: basidiomata 0.3-2 mm diam., resupinate over thin or thick, often irregular, frequently poorly delimited gall-like swellings of the host thallus, waxy-gelatinous, pale brown (usually more orange-brown than the host thallus and therefore easily distinguishable) to blackish. Fertile hyphae 2.5-5 μm diam., thick-walled, at least some with clamp connections. Haustorial branches present, with clamp connections, mother cell 3.5-5.5 μm diam., ± spherical or ellipsoidal, haustorial filament 1-1.5 μm thick, to at least 11 μm long. Hymenium hyaline, containing numerous probasidia. Probasidial initials ellipsoidal, proliferations occurring through the basal clamp. Hyphidia and cystidia absent. Basidia, when mature, 2-celled, with one longitudinal or rarely oblique septum, 10.5-15.5 μm diam., near the septum 12-17 μm long, both cells elongating at maturity to 30 μm long (epibasidium not included), in the upper part 4.5-7 μm diam. Epibasidia (sterigmata) subcylindrical and 2-4 μm thick, at least 30 μm long. Basidiospores (5.5-) 7.5-9 (-11) × (4-) 6.5-8 μm, subspherical to shortly ellipsoidal, with a distinct lateral apiculus.