Porina guentheri (Flot.) Zahlbr.
Cat. Lich. Univ., 1: 384, 1922. Basionym: Verrucaria guentheri Flot. - Bot. Z., 8: 575, 1850.
Synonyms: Porina eitneri Zahlbr.; Porina koerberi (Flot.) Lettau; Pseudosagedia guentheri (Flot.) Hafellner & Kalb; Sagedia ferruginosa Eitner; Trichothelium guentheri (Flot.) R.C. Harris
Distribution: N - Lomb, Piem (Isocrono & al. 2004). C - Sar.
Description: Thallus crustose, episubstratic, continuous or finely rimose, olive green, pale grey-brown or dark purple-grey. Perithecia black, 0.2-0.7 mm across, scattered, half to one quarter immersed, the apical part naked. Involucrellum of thick-walled, more or less elongated cells, purple-violet or purple-brown (Pseudosagedia-violet pigment), K+ dark grey-brown, HCl+ red-purple to red-brown; exciple colourless or straw-coloured, the pigmented parts K+ orange (Porina-yellow pigment); hamathecium of simple paraphyses; hymenial gel I-, K/I-. Asci 8-spored clavate-cylindrical, thin-walled, functionally unitunicate, I-, K/I-, the apex rounded and without a ring structure. Ascospores 5-7(-9)-septate, often submuriform with 1(-2) additional longitudinal septa, hyaline, elongate-fusiform, (20-)30-45(-48) x 5-6.5 µm. Pycnidia rare, black. Microconidia c. 4.5 x 0.7-1 µm. Photobiont trentepohlioid. Spot tests: thallus K-, C-, KC-, P-. Chemistry: thallus without lichen substances.Note: a cool-temperate to subarctic lichen found along mountain creeks in the montane and subalpine belts, on periodically inundated siliceous rocks, but also on very shaded, not inundated rocks near the ground; probably more widespread in the Alps.
Growth form: Crustose
Substrata: rocks
Photobiont: Trentepohlia
Reproductive strategy: mainly sexual
Periodically submerged (e.g. in creeks)
Commonnes-rarity: (info)
Alpine belt: absent
Subalpine belt: extremely rare
Oromediterranean belt: extremely rare
Montane belt: extremely rare
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: absent
Dry mediterranean belt: absent
Predictive model
Curtis Randall Björk CC BY-SA 4.0
British Columbia, Vancouver Island, Englishman's River Provincial Park Date: 1975-07-09 Photographed from specimen (Noble 5080, UBC), Pseudotsuga menziesii, Tsuga heterophylla, Taxus brevifolia mixed wood
Author: André Aptroot - Source: http://www.tropicallichens.net/ CC BY-SA-NC
Source: Keissler K. von 1938. Pyrenulaceae, Mycoporaceae, Coniocarpineae. In: Rabenhorst G L: Kryptogamen-Flora von Deutschland, Österreich und der Schweiz. 2nd, IX, Die Flechten, Abt. 1, 2. Gebr. Borntraeger, Leipzig, pp. 1-846.
Curtis Randall Björk – CC BY-SA 4.0
British Columbia, Vancouver Island, Englishman's River Provincial Park Date: 1975-07-09 Photographed from specimen (Noble 5080, UBC), Pseudotsuga menziesii, Tsuga heterophylla, Taxus brevifolia mixed wood
Growth form: Crustose
Substrata: rocks
Photobiont: Trentepohlia
Reproductive strategy: mainly sexual
Periodically submerged (e.g. in creeks)
Commonnes-rarity: (info)
Alpine belt: absent
Subalpine belt: extremely rare
Oromediterranean belt: extremely rare
Montane belt: extremely rare
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: absent
Dry mediterranean belt: absent
Predictive model
Index Fungorum
GBIF
Curtis Randall Björk CC BY-SA 4.0
British Columbia, Vancouver Island, Englishman's River Provincial Park Date: 1975-07-09 Photographed from specimen (Noble 5080, UBC), Pseudotsuga menziesii, Tsuga heterophylla, Taxus brevifolia mixed wood
Author: André Aptroot - Source: http://www.tropicallichens.net/ CC BY-SA-NC
Source: Keissler K. von 1938. Pyrenulaceae, Mycoporaceae, Coniocarpineae. In: Rabenhorst G L: Kryptogamen-Flora von Deutschland, Österreich und der Schweiz. 2nd, IX, Die Flechten, Abt. 1, 2. Gebr. Borntraeger, Leipzig, pp. 1-846.
