Collemopsidium angermannicum (Degel.) A. Nordin

Graphis Scripta, 13: 39, 2002. Basionym: Arthopyrenia angermannica Degel. - Ark. Bot., 24A, 3: 23, 1931.
Synonyms: Arthopyrenia strontianensis Swinscow; Pyrenocollema strontianense (Swinscow) R.C. Harris
Distribution: C - Sar.
Description: Thallus crustose, episubstratic, up to 120 µm thick, smooth to finely rimose, olive-brown to dark brown, subgelatinous when wet, the hyphae vertically oriented. Perithecia scattered, black, more or less immersed in the thallus to clearly projecting, sometimes partly covered by a thin thalline layer, globose or slightly flattened at apex, often depressed dear the ostiole, 0.12-0.3 mm in diam. Involucrellum absent; exciple dark throughout or slightly paler in lower part, more or less cellular, thicker around the ostiole; hamathecium of richly branched and anastomosed pseudoparaphyses, the hymenial gel I-. Asci 8-spored, ovoid to subcylindrical, usually stalked, with two functional wall layers, K/I-, the wall thickened above, with an ocular chamber, fissitunicate, with a distinct extruded rostrum at dehiscence. Ascospores 1-septate, hyaline, ovoid to ovoid-fusiform, one cell often wider than the other, 17-26 x 6-12 µm. Pycnidia black, immersed to slightly projecting, the conidiogenous cells cylindrical, phialidic. Conidia oblong-ellipsoid, 2.9-3.3 x c. 1.2 µm. Photobiont cyanobacterial, the cells globose, 3-9 μm, or sometimes slightly elongate and up to 12 μm long, densely aggregated in irregular clusters and enclosed in yellowish to slightly brownish gelatinous sheaths. Spot tests: all negative. Chemistry: without lichen substances.
Note: on often submerged siliceous rocks along streams and along the margins of lakes; widespread in the Holarctic region, but not common. A mainly western species, reported from Sardinia; also recorded from the Western Alps (France) in sites with a untypical ecology, and therefore these records in need of confirmation.
Growth form: Crustose
Substrata: rocks
Photobiont: cyanobacteria, coccaceous (e.g. Gloeocapsa)
Reproductive strategy: mainly sexual
Periodically submerged (e.g. in creeks)
paras Verrucaria spp.

Commonnes-rarity: (info)

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

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model - CC BY-NC

Source: - CC BY-NC