Amygdalaria consentiens (Nyl.) Hertel, Brodo & May. Inoue

in Inoue, J. Hattori Bot. Lab., 56: 322, 1984. Basionym: Lecidea consentiens Nyl. - Flora, 49: 371, 1866
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Description: Thallus crustose, episubstratic, continuous to rimose-areolate, usually thick, grey, brownish grey or pinkish brown, sometimes partially rust-coloured, often delimited by a black prothallus. Medulla white, I-. Cephalodia arising mainly between the areoles, flat or rarely slightly convex, almost concolorous with thallus or more intensively pinkish brown or grey, containing Stigonema. Apothecia lecideine, entirely immersed in thallus, (0.3-)0.4-0.9(-1.2) mm across, usually one or two per areole, with a dark brown to black, often umbonate disc and a weakly raised, concolorous to slightly rusty-orange-pruinose proper margin. Proper exciple poorly developed, black-brown, 50-70 μm wide laterally, without crystals, of conglutinated, radially arranged hyphae; epithecium brownish, with orange crystals; hymenium colourless, 150-200 μm high, I+ blue; paraphyses coherent, richly branched and anastomosing, submoniliform in upper part, the apical cells more or less swollen; subhymenium colourless, 45-60 μm high; hypothecium blackish brown, usually thin, bowl-shaped. Asci 8-spored, narrowly cylindrical-clavate, with a I+ blue tholus and an internal, darker I+ tubular structure, the external gel I+ faintly blue, Porpidia-type. Ascospores 1-celled, hyaline, ellipsoid, (22-)28-35(-40) x (9.5-)14-18(-22) μm, when young with a thin perispore. Pycnidia black, immersed. Conidia bacilliform, 6-9 x c. 1 μm. Photobiont chlorococcoid in thallus, cyanobacterial in cephalodia. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: a very rare, probably circum-arctic species, peculiar in having sunken apothecia and lacking soralia, growing on siliceous rocks in the Alpine belt. Known from a few stations in the Eastern and Northern Alps (Austria, Germany); to be looked for in the Italian Alps.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual



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Leif Stridvall http://www.stridvall.se/lichens/gallery/ Courtesy: Anita Stridvall


Leif Stridvall - Source: http://www.stridvall.se/lichens/gallery/
Courtesy: Anita Stridvall


Author: Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php


Leif Stridvall - Source: http://www.stridvall.se/lichens/gallery/
Courtesy: Anita Stridvall