Clavascidium umbrinum (Breuss) Breuss

Ann. naturhist. Mus. Wien, 98 (suppl.): 41, 1996. Basionym: Catapyrenium umbrinum Breuss - Linzer biol. Beitr., 22: 78, 1990.
Synonyms: Placidium umbrinum (Breuss) M. Prieto & Breuss
Distribution: N - Piem.
Description: hallus squamulose, medium to dark brown, dull, epruinose. Squamules 2-4 mm broad, 0.2-0.3 mm thick, rounded or slightly lobed, flattened, smooth, dispersed or loosely aggregated, usually not overlapping, rather fragile. Lower surface pale to usually dark, attached by simple dark rhizines and by 4-5.5 µm thick, brown rhizohyphae. Upper cortex paraplectenchymatous, 20-50 µm thick; lower cortex absent; medulla white in upper part, brownish in lower part. Perithecia laminal, black, half immersed in the squamules, broadly pyriform, without involucrellum, up to 0.4 mm across. Perithecial wall black-brown throughout; hymenium colourless, I+ red, K/I+ blue; paraphyses absent, substituted by periphyses. Asci 8-spored, clavate, thin-walled, the wall I , with biseriately arranged spores. Ascospores 1-celled, hyaline, thin-walled, 13-17 x 6-8 µm. Pycnidia black, laminal, immersed. Conidia oblong-ellipsoid, 3-4.5 x c. 1.5 µm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P- UV-. Chemistry: without lichen substances.
Note: a terricolous lichen found on calciferous, clayey soil; only known from Dalmatia, France and Piemonte, this species is worthy of further study.
Growth form: Squamulose
Substrata: soil, terricolous mosses, and plant debris
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: extremely rare
Submediterranean belt: extremely rare
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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United States National Herbarium - Smithsonian – CC BY-SA NC 3.0 United States, Texas, Granite Mt., Marble Falls. ex herb. C.C. Plitt 33


United States National Herbarium - Smithsonian – CC BY-SA NC 3.0
United States, Texas, Granite Mt., Marble Falls. ex herb. C.C. Plitt 33