Lepra dactylina (Ach .) Hafellner

in Hafellner & Türk, Stapfia, 104, 1: 172, 2016. Basionym: Lichen dactylinus Ach. - Lich. Suec. Prodr.: 89, 1799 (1798).
Synonyms:
Distribution:
Description: Thallus crustose, thinly episubstratic, white, densely covered in erect, 1-2.5(-4) mm tall and 0.4-1(-1.2) mm thick, robust, at first papillate, then columnar, mostly simple but sometimes 2- or 3-forked, isidia with concolorous, blunt and rounded apices, reacting I+ blue. Apothecia very rare, lecanorine, (0.2-)0.5-0.7(-1) mm across, immersed in the apices of the isidia; with a black, often white-pruinose disc and a thick, raised, often warted thalline margin. Epithecium brown to brown-black, K-; hymenium colourless; paraphyses coherent, 1.5-2 µm thick; hypothecium colourless. Asci 1-spored, broadly cylindrical, the apex without a distinct ocular chamber, the outer sheath K/I+ blue, otherwise K/I–, with an inner extensible layer, Pertusaria-type. Ascospores 1-celled, hyaline, ellipsoid, 120-310 x (40-)60-100(-115) µm, the wall 3-10(-25) µm thick, smooth. Photobiont chlorococcoid. Spot tests: K+ yellow turning brownish-red, C-, KC- or KC+ faintly yellow, P+ yellow turning red, UV-. Chemistry: fumarprotocetraric acid (major) plus variable amounts of protocetraric acid.
Note: on detritus and mosses, rarely directly on soil over siliceous substrata in tundra vegetation; circumpolar in the Arctic, scattered further south in the mountains, e.g. in Scotland, with a few records from Switzerland and 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 asexual, by isidia, or isidia-like structures (e.g. schizidia)

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Predictive model

Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php


Pier Luigi Nimis - CC BY-SA 4.0
Herbarium: TSB 7108



P.L. Nimis CC BY-SA 4.0
TSB 44078



P.L. Nimis CC BY-SA 4.0
TSB 44128



P.L. Nimis CC BY-SA 4.0
TSB 44129



Pier Luigi Nimis - CC BY-SA 4.0
TSB 44008



Pier Luigi Nimis - CC BY-SA 4.0
TSB 44008



P.L. Nimis CC BY-SA 04
TSB 7108



P.L. Nimis CC BY-SA 04
TSB 4408


Erichsen C.F.E. 1936. Pertusariaceae. - In: Dr. L. Rabenhorsts Kryptogamenflora von Deutschland, Österreich und der Schweiz. Bd. IX, Abt. 5, T. 1. Akad. Verlagsges., Leipzig, pp. 321-512, 513-728. - Public Domain