Stereocaulon botryosum Ach.

Lichenogr. Univ.: 581, 1810.
Synonyms: Stereocaulon alpinum var. botryosum (Ach.) Laurer; Stereocaulon evolutum var. fastigiatum (Anzi) Th. Fr.; Stereocaulon fastigiatum Anzi
Distribution: N - Frl (Tretiach & Hafellner 2000), TAA (Nascimbene & al. 2022), Lomb (Rivellini 1994, Rivellini & Valcuvia 1996, Oset 2015, Gheza 2017), Piem (Isocrono & al. 2004), VA (Borlandelli & al. 1996, Piervittori & Isocrono 1997, 1999).
Description: Primary thallus crustose-farinose, ephemeral, usually absent in mature individuals, secondary thallus fruticose, firmly attached to the rock, forming 1-2 cm broad cushions which are often subcrustose in central parts. Pseudopodetia with a solid cartilaginous axis of parallel hyphae surrounded by a lax medulla, erect, rigid, 5-20(-30) mm high, 0.3-0.7(-1.5) mm thick at base, white with a pink tinge, ochraceous to brownish black at base, grey-tomentose in lower part, usually glabrous in upper part, the apical parts abundantly branched. Phyllocladia crowded in the upper parts of pseudopodetia, granular-verruciform, glaucous white, often confluent, forming cauliflower-like masses. Cephalodia usually scarce and inconspicuous, 0.2-2 mm across, violet, often pruinose, with Nostoc or Stigonema. Apothecia rare, brown, 1-3 mm across, mostly terminal, with a convex disc and an indistinct proper margin. Proper exciple brownish yellow, of interwoven, more or less parallel hyphae; epithecium yellow-brown; hymenium colourless, the hymenial gel I- (but the asci reacting I+ blue); paraphyses more or less free, 1-1.5 µm thick, the apical cells clavate, 3-4.5 µm wide, with a dark cap; hypothecium colourless, dense, c. 40 µm high. Asci 4-6-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, 20-31 x 4-5 µm. Conidia 1-celled, hyaline, straight, 5-7 x 0.6-0.8 µm. Main photobiont: chlorococcoid. Spot tests: K+ yellow, C-, KC-, P- or P+ faintly yellow, UV-. Chemistry: atranorin and porphyrilic acid.
Note: an arctic-alpine, probably circumpolar lichen found on steeply inclined surfaces of siliceous rocks in humid-shaded situations, with optimum above treeline, up to the nival belt; restricted to the Alps in Italy.
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: rare
Subalpine belt: very 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


P.L. Nimis CC BY-SA 04
TSB 21112



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (16745)
2001/12/17



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (16745)
2001/12/17
phyllocladia



Pier Luigi Nimis - CC BY-SA 4.0
TSB 37418



Pier Luigi Nimis - CC BY-SA 4.0
TSB 37418



Pier Luigi Nimis - CC BY-SA 4.0
TSB 37418


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



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (21112)
2001/12/07