Stereocaulon glareosum (Savicz) H. Magn.

Göteb. K. Vetensk. Samh. Handl., 30: 60, 1928. Basionym: Stereocaulon tomentosum f. glareosum Savicz - Bull. Jard. Imp. Pierre le Grand, 14: 121, 1914.
Synonyms:
Distribution: N - Ven.
Description: Primary thallus persistent, of granular to incised-elongate phyllocladia with abundant interspersed cephalodia, forming a crust, secondary thallus fruticose. Pseudopodetia firmly attached, 1-2.5(-3) cm tall, the base to 1 mm thick, tapering to 0.5 mm at the apices, sparingly branched, ascending, terete, grey-tomentose on lower surface, dispersed or forming tufts, with a solid cartilaginous axis of parallel hyphae surrounded by a lax medulla. Phyllocladia abundant, cylindrical or papilliform, 0.3-1 mm long, whitish or brownish grey. Cephalodia verruciform to globose, 0.5-1.5 mm across, pale bluish grey, pale brownish violet or pinkish white, with a smooth to rarely fissured surface, containing Nostoc, abundant on the lower surface. Apothecia 1-2 mm across, terminal, with a dark brown, convex disc and a thin, paler, finally excluded proper margin. Proper exciple brown in outer part, colourless within; epithecium brown, K-; hymenium colourless, 45-50 µm high; paraphyses mostly simple, c. 1.5 µm thick, the apical cells, to 4.5 µm wide, with a dark cap; hypothecium colourless. Asci 8-spored, cylindrical-clavate, with a K/I+ blue outer layer and apical dome, and a central, K/I+ darker blue tube, Porpidia-type. Ascospores mainly 3-septate, hyaline, fusiform, usually slightly curved, 22-42 x 2.5-3.5 µm. Pycnidia dark, immersed. Conidia cylindrical-fusiform, slightly curved. Main photobiont chlorococcoid. Spot tests: K+ yellow, C-, KC- or KC+ violet (reaction often difficult to observe macroscopically, best evident on acetone extract on filter paper!), P+ faintly yellow, UV+ blue-white. Chemistry: atranorin and lobaric acid.
Note: an arctic-alpine to boreal-montane, probably circumpolar lichen found on sandy or gravelly ground, such as on banks of streams and in snow-beds, forming low, compact mats; probably more widespread in the Alps, with optimum near treeline.
Growth form: Fruticose

Substrata: soil, terricolous mosses, and plant debris
Photobiont: green algae other than Trentepohlia (primary); cyanobacteria, filamentous (e.g. Nostoc, Scytonema) (secundary, e.g. in cephalodia)
Reproductive strategy: mainly sexual

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
Index Fungorum GBIF

Einar Timdal - Source: http://nhm2.uio.no/lav/web/index.html - CC BY-NC



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: GZU (49-87)
2003/04/28


Frey E. 1933. Cladoniaceae (unter Ausschluß ded Gattung Cladonia) und Umbilicariaceae. In: Rabenhrst’s Kryptogamenflora von Deutschland, Österreich und der Schweiz. 15: 1-208.


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S3/Stereocaulon_glareosum.htm
France, 2/9/2014 - Bonneval-sur-Arc, pont de L'Oulietta, alt. 2500 m - Savoie


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S3/Stereocaulon_glareosum.htm
France, 2/9/2014 - Bonneval-sur-Arc, pont de L'Oulietta, alt. 2500 m - Savoie


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S3/Stereocaulon_glareosum.htm
France, 2/9/2014 - Bonneval-sur-Arc, pont de L'Oulietta, alt. 2500 m - Savoie


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S3/Stereocaulon_glareosum.htm
France, 2/9/2014 - Bonneval-sur-Arc, pont de L'Oulietta, alt. 2500 m - Savoie


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S3/Stereocaulon_glareosum.htm
France, 2/9/2014 - Bonneval-sur-Arc, pont de L'Oulietta, alt. 2500 m - Savoie


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S3/Stereocaulon_glareosum.htm
France, 2/9/2014 - Bonneval-sur-Arc, pont de L'Oulietta, alt. 2500 m - Savoie


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S3/Stereocaulon_glareosum.htm
France, 2/9/2014 - Bonneval-sur-Arc, pont de L'Oulietta, alt. 2500 m - Savoie


Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S3/Stereocaulon_glareosum.htm
France, 2/9/2014 - Bonneval-sur-Arc, pont de L'Oulietta, alt. 2500 m - Savoie