Staurothele orbicularis (A. Massal.) Th. Fr.

Öfvers. K. Svensk. Vetensk.-Akad. Förh., 21: 275, 1865. Basionym: Porphyriospora orbicularis A. Massal. - Ric. Auton. Lich. Crost.: 154, 1852.
Synonyms: Porphyriospora orbicularis var. geographica A. Massal.; Staurothele nigella (Kremp.) Kernst.; Staurothele viperae Servít
Distribution: N - Ven (Lazzarin 2000b), TAA, Lig (Giordani & al. 2016). C - Marc (Nimis & Tretiach 1999), Umb (Genovesi & Ravera 2001, Ravera & al. 2006), Abr (Cucchi & al. 2009, Gheza & al. 2021).
Description: Thallus crustose, endosubstratic or thinly episubstratic and appearing as minute, dirty whitish grey flecks with numerous black, curved lines most numerous in the peripheral parts. Perithecia black, without involucrellum, 0.3-0.4 mm across, at first completely immersed, later forming conical-hemispherical projections with a flattened apex, often covered with a thalline layer at least at the base. Exciple dark throughout; hymenium I+ blue; hymenial algae more or less isodiametrical; hamathecium of periphyses and periphysoids, interascal filaments absent. Asci 2-spored, clavate, the wall thickened above, with an ocular chamber, after dehiscence with a delicate extruded endotunica, I-, K/I-. Ascospores (sub-)muriform, pale brown to orange-brown, oblong-ellipsoid to narrowly oblong, 35-60 x 12-20 μm. Photobiont chlorococcoid (Stichococcus), present in both thallus and hymenium. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: on more or less calciferous rocks in upland areas: related to S. guestphalica, but with 2-spored asci, and more widespread.
Growth form: Crustose endolithic
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: rare
Oromediterranean belt: absent
Montane belt: very rare
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


P.L. Nimis CC BY-SA 4.0
TSB 23366



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (23366)
2001/11/30


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


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