Rinodina roscida (Sommerf.) Arnold

Verh. zool.-bot. Ges. Wien, 37: 133, 1887. Basionym: Lecanora roscida Sommerf. - Suppl. Fl. Lappon.: 97, 1826.
Synonyms: Berengeria turfacea var. microcarpa (Hepp) Trevis.; Rinodina turfacea var. microcarpa (Hepp) Körb.
Distribution: N - Frl (TSB 2759), Ven (Nimis 1994, Thor & Nascimbene 2007), TAA (Nascimbene & al. 2006), Lomb, Piem (Isocrono & al. 2004), VA (Piervittori & Isocrono 1999).
Description: Thallus crustose, episubstratic, thin and often evanescent or minutely granulose, white to greyish white, without a distinct prothallus. Apothecia lecanorine, usually abundant, 0.5-1(-3) mm across, constricted at base and often substipitate, with a concave to flat, black but often white-pruinose disc, and a prominent, smooth to crenulate, often white-pruinose thalline margin. Thalline exciple corticate, the cortex 20-40 µm thick, I-, the medulla with oxalate crystals unsoluble in K; epithecium brown; hymenium colourless, 100-150 µm high; hypothecium colourless, 30-60 µm high. Asci 8-spored, clavate, Bacidia-type. Ascospores 1-septate, brown, elongate-ellipsoid, 24-35 x 8-13 µm, with a well-developed torus and ontogeny of type A (apical wall thickening after septum formation). Pycnidia immersed in thallus. Conidia bacilliform, 4-5 µm long. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: with variable amounts of variolaric acid, zeorin and an unknown triterpenoid.
Note: an arctic-alpine, circumpolar species found on soil, bryophytes and plant debris over calcareous substrata in tundra-like habitats; widespread throughout the Alps.
Growth form: Crustose
Substrata: soil, terricolous mosses, and plant debris
Photobiont: green algae other than Trentepohlia
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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P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (2759)
2002/05/13


P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (2759)
2002/05/13


Curtis Randall Björk – CC BY-SA 4.0
British Columbia, Whistler, Seventh Heaven Date: 2007-08-02 Over humus in dry alpine heath