Dermatocarpon bachmannii Anders
Hedwigia, 63: 271, 1922.
Synonyms:
Distribution:
Description: Thallus foliose-umbilicate, heteromerous, dorsiventral, attached by a central holdfast, usually monophyllous, rigid when dry, 1-4 cm broad, (0.2-)0.3-0.5(-0.7) mm thick, growing amphibious in cold freshwaters. Upper surface grey to (rarely) grey-brown when dry, greenish when wet, pruinose or epruinose; lower surface dark brown to black, usually distinctly reticulate, erhizinate. Upper cortex 70-170 µm thick, pseudoparenchymatous, of anticlinally arranged hyphae, often with a brown pigment near the surface, overlain by an epinecral layer of air-filled hyphae; lower cortex c. of the same thickness, of anticlinally arranged hyphae; medulla white, I-. Perithecia numerous, immersed in the thallus and scattered over almost the whole upper surface (appearing as black dots), without involucrellum. Exciple colourless except in the brown uppermost part; hamathecium of periphyses and periphysoids, interascal filaments absent; hymenial gel hemiamyloid. Asci 8-spored, clavate, I-, fissitunicate, the wall thickened above, with an ocular chamber, dehiscent by extrusion of an endotunica to form a delicate rostrum, Verrucaria-type. Ascospores 1-celled (rarely 1-septate), hyaline, elongate-ellipsoid, (13-)16-20(-25.5) x 6-8(-9) µm. Pycnidia rare, black, immersed, multi-chambered. Conidia short-bacilliform. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.Note: a species described from the Czech Republic and apparently more widespread in Northern Europe, occurring in seasonal seepages, mostly on base-rich rocks, such as serpentine or calcareous rocks. To be looked for in Italy.
Growth form: Foliose, umbilicate
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
On otherwise dry surfaces with short periods of water seepage after rain
Predictive model
Curtis Randall Björk – CC BY-SA 4.0
British Columbia, Clearwater Valley Date: 2013-05-09 On basalt boulder at river shore
Growth form: Foliose, umbilicate
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
On otherwise dry surfaces with short periods of water seepage after rain
Predictive model
