Anema decipiens (A. Massal.) Forssell

N. Acta Reg. Soc. Sci. Upsal., ser. 3, 13: 92, 1885. Basionym: Omphalaria decipiens A. Massal. - Framm. Lichenogr.: 14, 1855.
Synonyms: Collema decipiens (A. Massal.) Nyl.; Thyrea decipiens (A. Massal.) A. Massal.
Distribution: N - VG (Tretiach 1993), Ven (Lazzarin 2000b), TAA, Lomb, Piem (Isocrono & al. 2004), Lig (S-F145460). C - Marc (TSB 33889), Abr (Jatta 1909-1911). S - Camp (Nimis & Tretiach 2004, Garofalo & al. 2010), Pugl, Si (Nimis & al. 1994, 1995).
Description: Thallus squamulose, homoiomerous, slightly gelatinous when wet. Squamules 1-2 mm wide, brown-black to black, but usually blue-pruinose, with a mostly entire margin, dispersed to usually crowded to form effuse crusts, with an often lobulate to incised margin, covered in soredia- or isidia-like granules. Apothecia 1-2 per squamule, first immersed and urceolate, but soon expanded and clearly lecanorine, 0.3-0.5 mm across, with a dark reddish brown, concave to flat disc, and a thick, rugose, pruinose thalline margin. Epithecium orange-brown, thin; hymenium colourless, 100-150 µm thick, the hymenial gel I+ deep blue; paraphyses monilifrom, 3-4 µm thick, the apical cell slightly swollen and to 5 µm thick; hypothecium pale orange-brown, 20-50 µm high in central part. Asci 8-spored, cylindrical-clavate, thin-walled, with an amyloid apical cap. Ascospores 1-celled, hyaline, broadly ellipsoid to subglobose, 9-15 x 7-10 µm. Pycnidia immersed, globose to pyriform. Conidia hyaline, ellipsoid to narrowly ellipsoid, 2.5-4 x 1.5-2 µm. Photobiont cyanobacterial, chroococcoid, of a few cells surrounded by a gelatinous sheath which is yellowish brown to purple near the thallus surface. Spot tests: all negative. Chemistry: no lichen substances.
Note: on steeply inclined, sunny surfaces of calcareous rocks (mainly limestone, but also calciferous schists and sandstone) with periodical water seepage after rain, below the subalpine belt. Probably widespread throughout the country.
Growth form: Crustose
Substrata: rocks
Photobiont: cyanobacteria, coccaceous (e.g. Gloeocapsa)
Reproductive strategy: mainly sexual
On otherwise dry surfaces with short periods of water seepage after rain

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: rare
Submediterranean belt: rather common
Padanian area: extremely rare
Humid submediterranean belt: rather rare
Humid mediterranean belt: rather rare
Dry mediterranean belt: rather rare


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 (33890)
2003/03/11