Acarospora hospitans H. Magn.

Göteb. Vetensk.-och Vitter.-Handl., ser. 4, 28, 2: 111, 1924.
Synonyms: Acarospora impressula var. hospitans (H. Magn.) Clauzade & Cl. Roux
Distribution: N - TAA (Pl. Graec. Lich. 182), Piem (Pistocchi & al. 2026), Emil (Fariselli & al. 2020). C - Sar (Brackel & Berger 2019). S - Bas (Nimis & Tretiach 1999), Cal (Puntillo 1996), Si (Poli & al. 1995, Nimis & al. 1996b, Grillo & Caniglia 2004, Brackel 2008c).
Description: Thallus crustose, episubstratic, chestnut brown to dark brown, areolate-subsquamulose, forming small islands or lines on the thalli of other crustose lichens, the areoles dispersed or contiguous, 0.3-1.5(-1.8) mm wide, smooth, usually slightly glossy, flat or moderately convex, the lower side pale. Upper cortex (20-)30-40(-60) µm thick, brown in upper part, colourless in lower part, the cells 1.5-2.5 μm wide, overlain by a thin amorphous layer; algal layer regular, usually continuous; medulla white, inspersed with crystals. Apothecia lecanorine, of different shapes but most often elongate, 0.1-1.5 x 0.1-1.2 mm, immersed in the areoles, usually 2-5 per areole, with a brown, concave to flat disc and a thin, sometimes poorly evident thalline margin. Proper exciple 15-20 µm thick; epithecium red-brown; hymenium colourless, (50-)75-90(-100) µm high, the hymenial gel euamyloid, I+ persistently dark blue; paraphyses 1.5-2 µm thick at base, the apical cells 3-3.5 µm wide; hypothecium colourless, c. 30 µm high. Asci c. 100-spored, clavate, the apical dome K/I-. Ascospores 1-celled, hyaline, broadly ellipsoid, 3-5 x 2-3 µm. Pycnidia immersed. Conidia ellipsoid, 1-2 x 0.7-1.5 µm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: on siliceous rocks, growing on the thalli of other crustose lichens, according to Roux (in litt.) exclusively on Aspicilia spp. Much overlooked, and in need of further study.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
paras Aspicilia spp.
Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: rare
Subalpine belt: rather rare
Oromediterranean belt: very rare
Montane belt: rare
Submediterranean belt: extremely rare
Padanian area: absent
Humid submediterranean belt: extremely rare
Humid mediterranean belt: extremely rare
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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Predictive model
Herbarium samples
INDEX FUNGORUM GBIF DOLICHENS


Domenico Puntillo; Owner: Domenico Puntillo
Italy, Herb. Puntillo



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (35208)
2002/07/09
on the host, Aspicilia sp.



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (35208)
2002/07/09
on the host, Aspicilia sp.



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (35208)
2002/07/09
on the host, Aspicilia sp.


Magnusson A. H. (1935) Acarosporaceae, Thelocarpaceae. - In: Rabenhorst G. L.: Kryptogamen-Flora von Deutschland, Österreich, und der Schweiz-. 2nd- IX. Die Flechten. Abt. 5- 1. Gebr. Borntraeger. Leipzig, pp. 1-318. – Public Domain