ITALIC 8.0

Scytinium subtorulosum (Nyl. ex Stizenb.) Otálora, P.M. Jørg. & Wedin

Fungal Diversity, 64, 1: 291, 2013. Basionym: Collema subtorulosum Nyl. ex Stizenb. - Ber. Tät. St. Gall. naturw. Ges.: 265, 1882

Synonyms: Leptogium subtorulosum (Nyl. ex Stizenb.) Degel.

Distribution:

Description: Thallus minutely fruticose, dark olive green or brownish, dull, of loosely adpressed, subcylindrical to slightly flattened, somehow knotty, dichotomously branched, 1-4 mm long, c. 0.2-0.35 mm thick lobes, forming deeply branched rosettes; lobes loosely appressed (the tips mostly free), the central ones ascending, sometimes with globose to subcylindrical isidia-like lobules, the surface dull, roughened, uneven. Cortex only partially developed, consisting of a single layer of irregularly isodiametrical, c. 5 µm wide cells; central parts of lobes with irregularly arranged hyphae, the cells somewhat elongated to angular, to 15 x 3-5 µm. Apothecia and pycnidia extremely rare. Photobiont cyanobacterial (Nostoc, the cells in short, twisted chains). Spot tests: all negative. Chemistry: without lichen substances.

Note: a species described from Switzerland, growing on long-time moist calcareous rocks and on acidic rock irrigated by calciferous water along creeks and rivers, sometimes even submerged; widespread in Europe (including Macaronesia) but rarely collected. From the Alps there are only a few scattered, historical records, all of them outside Italian territory. To be looked for in the Italian Alps.

Growth form: Fruticose

Substrata: rocks

Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)

Reproductive strategy: mainly asexual, by thallus fragmentation

Periodically submerged (e.g. in creeks)

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

Source: Thüs H. & Schultz M. (2009) Freshwater flora of central Europe. Vol. 21(1): 1-223 Fungi Part I: Lichens.