Metamelanea caesiella (Th. Fr.) Henssen

in Henssen & Jørgensen, Lichenologist 22: 141, 1990. Basionym: Pyrenopsis caesiella Th. Fr. - Bot. Notiser: 58, 1866.
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Distribution:
Description: Thallus crustose, areolate or rimose-areolate, the surface ash-grey-pruinose, up to 300 µm thick, homoiomerous, the areoles dying from the base, forming effuse patches. In section the thallus appears loosely paraplectenchymatous, with densely packed, vertically arranged photobiont cells. Apothecia rare, 0.5-1 mm across, immersed to adnate, with a conspicuous thalline margin and a dark brown to black, flat disc, sometimes with thalline elements inspersed. Proper exciple thin, of ± parallel, gelatinized hyphae; epithecium brownish; hymenium colourless, the hymenial gel K/I+ blue; paraphyses rather lax, branched, with submoniliform apical cells; hypothecium colourless. Asci 8-spored, long-cylindrical-clavate, thin-walled, without internal amyloid structures. Ascospores 1-celled, hyaline, ellipsoid, 12-15 x 6-8 µm. Pycnidia immersed. Conidia bacilliform, simple, hyaline, 3-4 x c. 1 µm. Photobiont cyanobacterial, chroococcoid, in densely packed clusters surrounded by brown sheaths, the individual cells 4-6 µm wide. Spot tests: all negative. Chemistry: without lichen substances.
Note: a species described from Norway (the type is sterile), and later also found in Germany and Belgium, growing on calcareous rocks (Schultz & al. 2007). To be looked for in Italy.
Growth form: Crustose
Substrata: rocks
Photobiont: cyanobacteria, coccaceous (e.g. Gloeocapsa)
Reproductive strategy: mainly sexual

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Predictive model

Einar Timdal http://www.nhm2.uio.no/botanisk/lav/Photo_Gallery/Metamelanea/caesiella_G=Norway+Oppland_H=O-L-169769_C=ET_I=1.jpg Cuba


Einar Timdal - Source: http://www.nhm2.uio.no/botanisk/lav/Photo_Gallery/Metamelanea/caesiella_G=Norway+Oppland_H=O-L-169769_C=ET_I=1.jpg
Cuba