Hymenelia obtecta (Vain.) Poelt & Vězda

Bibl. Lichenol., 16: 364, 1981. Basionym: Lecanora obtecta Vain. - Meddeland. Soc. Fauna Fl. Fenn., 3: 107, 1878.
Synonyms: Aspicilia obtecta (Vain.) Hav.; Ionaspis obtecta (Vain.) R. Sant.
Distribution: N - TAA (Thor & Nascimbene 2007, Nascimbene & al. 2022).
Description: Thallus crustose, episubstratic, rust-red, rimose or rimose-areolate, the areoles convex, matt, without a distinct prothallus. Apothecia 0.2-0.4 mm across, at first immersed, then sessile and more or less constricted at base, with a concave to flat, pale brown to reddish brown disc, a darker, thick, prominent, often radially striate proper margin, and a thin, finally often excluded thalline margin. Epithecium pale brown, N-, inspersed with brown to black granules not dissolving in K; hymenium colourless or pale yellow, 160-180 µm high, I+ blue; paraphyses rather lax, simple or sparingly branched and submoniliform in upper part, 1.5-2 µm thick, the apical cells not swollen; hypothecium colourless. Asci 8-spored, cylindrical-clavate, the outer wall K/I+ blue, but the inner walls and apical dome K/I-. Ascospores 1-celled, hyaline broadly ellipsoid to subglobose, (12-)17-26 x (6-)10-13 µm. Photobiont chlorococcoid (Asterochloris), the cells <15 µm wide. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.
Note: recently found in the Alps, this mainly northern lichen should be looked for more intensively on iron-containing siliceous rocks.
Growth form: Crustose
Substrata: rocks
Photobiont: Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

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

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model

Curtis Randall Björk – CC BY-SA 4.0
British Columbia, Whistler Municipality, The Sugar Cubes Date: 2007-08-00 On basalt blocks at base of short cliff, montane forest