Calicium denigratum (Vain.) Tibell

Bot. Notiser, 129, 2: 132, 1976. Basionym: Calicium curtum var. denigratum Vain. - Medd. Soc. Fauna Flora Fenn., 6: 95, 1881
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Description: Thallus crustose, thin and poorly evident, endosubstratic. Apothecia long-stalked, pin-like, epruinose, shining black. Stalk 0.7-1.3 mm high, 0.06-0.09 µm thick, of sclerotized, dark, irregularly interwoven hyphae, the outer layer of non-sclerotized, prosoplectenchymatous hyphae, covered with a thin, transparent gelatinous sheath, the central part dark brown. Capitulum slightly bell-shaped, with an exciple of sclerotized, dark brown cells; mazaedium well developed, black; paraphyses cylindrical, formed singly, dissolving early; hypothecium dark brown, 55-70 µm high. Asci cylindrical, formed singly, dissolving early with uniseriate ascospores. Ascospores 1-septate, dark brown, ellipsoid, with an irregularly areolate wall, 11-14 x 6-8 µm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-; ascomata I- in all parts. Chemistry: without lichen substances.
Note: on decorticated stumps and snags in montane-subalpine coniferous forests, with several records from the Eastern Alps, outside Italian territory; to be looked for in the Italian Alps.
Growth form: Crustose
Substrata: lignum
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual



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P.L. Nimis CC BY-SA 4.0
TSB 41540



Pier Luigi Nimis - CC BY-SA 4.0
TSB 41540