Stereocaulon vesuvianum var. nodulosum (Wallr.) I.M. Lamb

in Poelt, Bestimmungss. europ. Flechten: 633, 1969.. Basionym: Patellaria paschalis var. nodulosa Wallr. - Fl. crypt. Germ., 1: 441, 1831.
Synonyms: Stereocaulon denudatum Flörke; Stereocaulon denudatum Flörke var. depressum H. Magn.; Stereocaulon vesuvianum Pers. f. depressum (H. Magn.) I.M. Lamb; Stereocaulon vesuvianum Pers. var. denudatum (Flörke) I.M. Lamb ex Poelt comb. inval.; Stereocaulon vesuvianum Pers. var. depressum (H. Magn.) I.M. Lamb
Distribution: N - Lomb (Ravera & al. 2022)
Description: Primary thallus crustose, ephemeral, usually absent in mature individuals. Pseudopodetia with a solid cartilaginous axis of parallel hyphae surrounded by a lax medulla, 1-4 cm tall, firmly attached, more or less caespitose, erect to decumbent, completely glabrous, whitish or greyish, dark at the base, branched in upper part, often sorediate. Phyllocladia in most cases almost entirely covering the pseudopodetia, small, often verrucose, the largest usually peltate, flattened or concave, at least some of them with a dark olive-coloured central part and paler margins, partly confluent, forming plate-like squamules. Cephalodia rare, verruculose, dark olive brown, containing Stigonema. Apothecia rare, 0.5.1 mm across, on lateral branches, with a dark brown disc. Paraphyses simple, slightly thickened above, with dark cap; hymenium and hypothecium colourless. Asci 8-spored, clavate to cylindrical, Porpidia-type. Ascospores septate, hyaline, fusiform. Spot tests: thallus K+ yellow (rarely K+ red), C-, KC-, P+ orange, UV-. Chemistry: atranorin, and variable amounts of stictic and norstictic acids.
Note: a name used for morphs with glabrous podetia and partly confluent phyllocladia forming plate-like squamules, sorediate or not, most often found on metal-rich rocks; reported from both Hemispheres, including Europe, but not always distinguished; probably more widespread in the Alps, incl. the Italian Alps.
Growth form: Fruticose

Substrata: rocks
Photobiont: green algae other than Trentepohlia (primary); cyanobacteria, filamentous (e.g. Nostoc, Scytonema) (secundary, e.g. in cephalodia)
Reproductive strategy: mainly sexual
Species of metal-rich rocks
Poorly known taxon in need of further study

Commonnes-rarity: (info)

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

Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Text_S/Stereocaulon_vesuvianum.htm
France, session AFL 2013 - Puy-de-Dôme


Damien Ertz – Source: http://www.lichenology.info/cgi-bin/baseportal.pl?htx=atlas_frm&newId=2159


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



P.L. Nimis CC BY-SA 4.0
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P.L. Nimis CC BY-SA 4.0
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P.L. Nimis CC BY-SA 4.0
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Pier Luigi Nimis CC BY-SA 4.0
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P.L. Nimis CC BY-SA 4.0
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P.L. Nimis CC BY-SA 4.0
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P.L. Nimis CC BY-SA 4.0
TSB 9508