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Description

 Life habit: lichenicolous, gall-forming, non-lichenized; Basidiomata: extremely variable in form, size and color, cartilaginous, generally subspherical and convex with a constricted base, often with lobate margins, sometimes flattened or with a concave central part, rarely effuse and covering larger areas around the branches of the host, surface smooth, rarely tuberculate, cartilaginous, pale pink, reddish brown, dark brown or black, 0.2-2.5 mm in diam.; context hyphae: thin-walled, without clamps, 2-3 µm wide; haustorial branches: frequent, tremelloid; mother cell: 2.5-4.5 µm in diam.; hymenium: containing numerous probasidia, with clavate probasidial initials, with or without basal clamps, without hyphidia and cystidia; basidia: when mature, clavate to subcylindrical, with 1-3 transverse septa, 20-44 x 3-6.5 µm; epibasidia: subcylindrical, 2-3 µm thick, up to 85 µm long; basidiospores: sub-globose to ellipsoid, with a distinct apiculus, germinating with a germ tube, 4.5-8 x 4-7.5 µm; Anamorph: catenate conidia often present, 3-5 x 2-3.5 µm.; Hosts: thallus of Usnea species (not on subgen. Neuropogon), but also on Protousnea dusenii; World distribution: cosmopolitan, known from all continents, except Antarctica; Sonoran distribution: Arizona.; Notes: Biatoropsis usnearum is extremely similar to Cystobasidium usneicola, that grows on the same hosts, and induces the formation of the same type of galls. Galls of 

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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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