Pertusaria trochiscea Norman

Kgl. norske vidensk. Selsk. Skr., 5: 365, 1868.
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Distribution:
Description: Thallus crustose, white, thin to moderately thick, smooth to warted, dull, often pruinose, continuous. Apothecia at first perithecioid, immersed into basally constricted, up to 0.9 mm wide thalline warts, usually 1 per wart, opening through a black, at first punctiform, later slightly expanded disc. Epithecium dark brown to black, K+ violet; hymenium colourless; paraphyses branched and anastomosing; hypothecium colourless. Asci (2-)4(-5)-spored, with uni-to biseriately arranged spores. Ascospores 1-celled, hyaline, ellipsoid to fusiform, 50-90 x 25-50 µm, double-walled, the wall smooth, usually with the apical wall convex inward. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: low amounts of 2, 7-dichlorolichexanthone, sometimes with traces of stictic and constictic acids.
Note: an arctic-alpine species growing on bryophytes and plant debris near and above treeline, with scattered records in Northern Europe from the subarctic to the boreal-alpine zone, rarely recorded elsewhere, with a few records from the Eastern Alps (Austria). To be looked for in the Italian Alps.
Growth form: Crustose
Substrata: soil, terricolous mosses, and plant debris
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

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Predictive model

Wisconsin State Herbarium, Lichens (WIS) – CC BY-NC 4.0 - Source: https://lichenportal.org/imglib/lichens/WIS/WIS-L-0135/WIS-L-0135441.JPG
Leg. et Det. K. Kalb Nr: 526 Date: 1970-08-05 Locality: Sweden, Torne lappmark (TL), Parish Kiruna (behind: Jukkasjärvi), Torneträsk Area; Path from Björkliden from Nuolja Latitude/Longitude: 68.377985 18.692488 +-2720m. WGS84, 475 m