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 Add this item to the list  Tremella pertusariae Diederich sp. nov.
Page number:133 
Remarks (internal):T. pertusariae is distinguished from the other species of the genus with stalked basidia by the absence of clamp connections, larger four-celled basidia and basidiospores. 
Description type:Original description 
Description:Tremella pertusariae Diederich sp. nov.
Basidiomata pale brown to dark brown or blackish, waxy, at first regularly convex to subglobose, later irregular, sometimes cerebriform, 0.3-1.3 mm in diam.; basidiomata rarely absent, fungus inducing gall formation, galls at first concolourous with the remainder of the lichen thallus, becoming brownish, irregularly convex, with a constricted base, up to 3 mm in diam.; context hyphae thick-walled, 3-3.5 µm in diam., clamp connections not observed; haustorial branches present, tremelloid, mother cell subspherical to ellipsoid, 3.5-4.5 x 3-3.5 µm, haustorial filament 1-3 µm long. Hymenium hyaline, or with a brown piµment becoming violet in KOH, containing numerous probasidia; probasidial initials claviform, with a long stalk, clamp connections not observed; hyphidia and cystidia absent. Basidia, when mature, 2-4 celled, with transverse, oblique or longitudinal septa, with a long stalk up to 20 µm long and 2-4 µm in diam., upper part (without stalk) ellipsoid to subspherical, 22-26(-30) x 14-19(-23) µm; epibasidia subulate to subcylindrical, 3-7.5 µm in diam., 20-30 µm long. Basidiospores subspherical, with a distinct apiculus, 8.5-11.5 x 7.5-10 µm. Anamorph unknown.
Etymology: Growing on Pertusaria.
Hosts: Basidiomata generally growing on the apothecia (hymenium) of Pertusaria hymenea (Ach.) Schaerer, more rarely on the thallus of P. sp. (Italy, Mexico, U. S. A.), or basidiomata absent, fungus inducing gall formation on the thallus of P. pertusa (Weigel) Tuck. (Germany).
Distribution: Europe (Belgium, France, Germany, Great Britain, Ireland, Italy, Spain) and America (Mexico, U. S. A.). The species is very common in the western Pyrenees (France and Spain).
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