Sporodictyon cruentum (Körb.) Körb.

Parerga Lichenol.: 332, 1863. Basionym: Segestrella cruenta Körb. - Denkschr. Schles. Ges. vaterl. Cultur: 237, 1853.
Synonyms: Polyblastia cruenta (Körb.) P. James & Swinscow; Polyblastia henscheliana (Körb.) Lönnr.; Polyblastia robusta Arnold; Sphaeromphale henscheliana Körb.; Sporodictyon henschelianum (Körb.) Körb.; Verrucaria subumbrina Nyl.
Distribution: N - TAA (Thor & Nascimbene 2007, Nascimbene & al. 2022), Lomb (Nascimbene 2006).
Description: Thallus crustose, episubstratic, continuous to rimose, grey-green (in shade) to brown, greenish black when wet. Perithecia black, forming 0.5-0.7 mm wide projections, often almost completely covered by a thalline layer. Involucrellum of pseudoparenchymatous cells, progressively diverging from exciple and reaching the base of the perithecium; exciple dark brown in upper part, paler at base; hamathecium of periphyses and periphysoids, interascal filaments absent; hymenial gel hemiamyloid, I+ red (I+ blue at very low concentrations of I), K/I+ blue. Asci 8-spored, clavate, K/I-, fissitunicate, the wall thickened above, with an ocular chamber, dehiscent by extrusion of an endotunica to form a delicate rostrum. Ascospores muriform, medium brown when mature, ellipsoid, (40-)55–65(-70) x (21-)29–36(-42) μm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a silicicolous species, periodically submerged in montane to Alpine creeks; poorly collected and perhaps more widespread in the Alps. For further details see Savic & Tibell (2009).
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Periodically submerged (e.g. in creeks)

Commonnes-rarity: (info)

Alpine belt: very rare
Subalpine belt: 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

pH of the substrata:

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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model
Herbarium samples
Index Fungorum GBIF


Felix Schumm – CC BY-SA 4.0
[14285] Österreich, Vorarlberg



Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige



Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige



Felix Schumm – CC BY-SA 4.0
[14285] Österreich, Vorarlberg



Felix Schumm – CC BY-SA 4.0
[14285] Österreich, Vorarlberg



Juri Nascimbene - CC BY-SA 4.0
Italy, Trentino-Alto Adige


Source: Zschacke, H. (1934) Epigloeaceae, Verrucariaceae und Dermatocarpaceae. In: Dr. L. Rabenhorst‘s Kryptogamen-Flora, Band 9, Abt. 1, Teil 1. Akademische Verlagsgesellschaft, Leipzig, 695 pp. - Public Domain