Stereocaulon evolutum Graewe

Bot. Notiser: 181, 1865.
Synonyms: Stereocaulon spissum Nyl. ex Hue var. laxum Frey
Distribution:
Description: Primary thallus crustose, ephemeral, usually absent in mature individuals. Pseudopodetia loosely attached to the rock, slender, arched or prostrate, grey, rigid, 1-3 cm high, irregularly branched from the base, dorsiventral, esorediate, with a solid cartilaginous axis of parallel hyphae surrounded by a lax medulla, not tomentose (a grey tomentum may be rarely present only in the apical parts), forming up to 6 cm broad, more or less compact cushions. Phyllocladia often crowded in apical parts of pseudopodetia, squamulose, flattened, deeply divided into more or less cylindrical lobes, often overlapping and concealing the pseudopodetia, the lower surface glabrous, olive-grey. Cephalodia inconspicuous, olive-brown, with Stigonema, embedded in the tomentum. Apothecia extremely rare, terminal, brown, up to 1 cm across. Proper exciple brown in outer part, colourless within; epithecium brown, K-; hymenium colourless; paraphyses simple, slightly thickened above, with a dark cap; hypothecium colourless. Ascospores septate, hyaline, characteristically short-ellipsoid, up to 30 µm long. Main photobiont chlorococcoid. Spot tests: K+ yellow, C-, KC+ violet (reaction often difficult to observe), P+ faintly yellow, UV+ blue-white. Chemistry: atranorin and lobaric acid.
Note: widespread in Europe, but most common in the west, surprisingly with a few records from the Eastern Alps only (Austria); to be looked for in 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

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: extremely 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

Courtesy Danièle et Olivier Gonnet - Source: https://www.afl-lichenologie.fr/Photos_AFL/Photos_AFL_S/Stereocaulon_evolutum.htm
France, session AFL 2007 - Finistère



P.L. Nimis CC BY-SA 04
TSB 16745



P.L. Nimis CC BY-SA 04
TSB 42551


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


Joël Querellou - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=393&lang=en
Belgium, Menez-Meur


Joël Querellou - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=393&lang=en
Belgium, Menez-Meur


Joël Querellou - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=393&lang=en
Belgium, Menez-Meur


Michel David - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=393&lang=en
France, Roc'h Tredudon


Michel David - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=393&lang=en
France, Morgat


Alain Gerault - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=393&lang=en
France, Menez-Meur


Alain Gerault - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=393&lang=en
France, Menez-Meur


Alain Gerault - Source: http://www.lichensmaritimes.org/index.php?task=fiche&lichen=393&lang=en
France, Menez-Meur


Ulrich Kirschbaum
Sweden