Cetraria obtusata (Schaer.) van den Boom & Sipman

Lichenologist, 26: 106, 1994. Basionym: Cetraria aculeata var. obtusata Schaer. - Lich. Helv. Spicil., 4-5: 225, 1823.
Synonyms:
Distribution: N - TAA (Nascimbene 2005), Lomb (Rabenhorst Lich. Eur. 743 and Anzi Lich. Lang. 22: van den Boom & Sipman 1994, Dalle Vedove & al. 2004), Piem (TSB 34556), VA (van den Boom & Sipman 1994).
Description: Thallus fruticose, dichotomously to irregularly branched, matt to glossy brown, forming loosely attached, 1-3 cm high tufts. Branches terete or slightly flattened, erect or prostrate, 0.3-1(-2) mm wide, without main stems, with obtuse tips, the margins with c. 0.1 mm thick, up to 1 m long spinulose outgrowths. Pseudocyphellae rounded, punctiform, often surrounded by black projections. Cortex 2-layered, with an outer, brownish, paraplectenchymatous layer, and an inner, colourless layer of periclinally oriented hyphae: medulla arachnoid, lax, pale yellow. Apothecia unknown. Pycnidia dark, brought on spinulose outgrowths. Conidia clavate, 6-7 x 1-1.5 µm. Photobiont chlorococcoid. Spot tests: cortex K-, C-, KC-, P-. ; medulla K-, C+ yellow-orange, KC+ yellow, P-, UV-. Chemistry: medulla with secalonic acid C, and two unidentified substances.
Note: ecologically similar to C. ericetorum, but much rarer, and perhaps more bound to dry-continental situations above treeline; probably confined to the Alps in Italy.
Growth form: Fruticose

Substrata: soil, terricolous mosses, and plant debris
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by thallus fragmentation

Commonnes-rarity: (info)

Alpine belt: very rare
Subalpine belt: absent
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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P.L. Nimis CC BY-SA 4.0
TSB 34439



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (34439)
2002/01/14