Arthonia stereocaulina (Ohlert) R. Sant.

Lichens and Lichenicolous Fungi of Sweden and Norway: 18, 1993. Basionym: Arthonia nephromiaria var. stereocaulina Ohlert - Schr. Phys.-Ökon. Ges. Königsberg, 11: 49, 1870.
Synonyms: Bryostigma stereocaulinum (Ohlert) S. Y. Kondr. & J.-S. Hur
Distribution: N - TAA (Bilovitz & al. 2014, Brackel 2016).
Description: Thallus inapparent, not lichenized, the hyphae developing on the phyllocladia of Stereocaulon-species. Apothecia arthonioid, black, epruinose, 0.1-0.3(-0.5) mm across, with a flat to slightly convex disc, without a distinct proper margin. Proper exciple poorly developed; epithecium pale green-brown; hymenium pale brown, I+ rapidly wine-red, K/I+ purple to brown-red; paraphysoids distinct; hypothecium colourless to pale reddish brown. Asci 8-spored, broadly clavate to subglobose, semi-fissitunicate, with a large, non-amyloid apical dome, and a distinct ocular chamber, Arthonia-type. Ascospores 1-septate, with unequal cells, hyaline, narrowly ellipsoid, (10.5-)11.5-14.5(-17) x 4-6(-7.5) μm. Photobiont absent. Spot tests: K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: a lichenicolous fungus growing on species of Stereocaulon, probably more widespread in the Alps.
Growth form: Lichenicolous fungus
Substrata: soil, terricolous mosses, and plant debris
Reproductive strategy: mainly sexual
paras Stereocaulon spp.

Commonnes-rarity: (info)

Alpine belt: very rare
Subalpine belt: very rare
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: absent
Dry mediterranean belt: absent


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Poleotolerance:

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Altitudinal distribution:

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