Koerberiella wimmeriana (Körb.) Stein

in Cohn, Krypt.-Fl. von Schlesien, 2, 2: 143, 1879. Basionym: Zeora wimmeriana Körb. - Denkschr. schles. Ges. vaterl. Kultur: 232, tab. 4, fig. 3, 1853.
Synonyms: Aspicilia acceptanda (Nyl.) Arnold ex Hue; Aspicilia leucophyma (Leight.) Hue; Aspicilia littoralis (Vain.) Hue; Lecanora acceptanda Nyl.; Lecanora creatina Norman ex Th. Fr.; Lecanora leucophyma Leight.; Lecanora littoralis (Vain.) Zahlbr.; Lecanora wimmeriana (Körb.) Poetsch; Lecanorella josiae Frey; Lecidea creatina (Th. Fr.) Stizenb.; Perspicinora leucophyma (Leight.) Riedl; Pertusaria littoralis Vain.
Distribution: N - TAA (Nascimbene & al. 2007b), Lomb, Piem (Favero-Longo & al. 2015).
Description: Thallus crustose, episubstratic, rimose to areolate, with a paraplectenchymatous cortex, often delimited by a dark prothallus, with numerous, whitish grey to pinkish grey, isidia-like, cylindrical to subclavate, 0.5-1.2 mm tall papillae bearing a pycnidium on the top. Medulla poorly developed, I-. Apothecia lecanorine, sessile, 0.5-1 mm across, with a pale brown to dark red-brown, flat to slightly convex disc and a thick, smooth thalline margin. Amphithecium corticate, paraplectenchymatous, brownish in outer part; proper exciple poorly developed; epithecium brownish; hymenium colourless K+ orange-brown; paraphyses slender, sparingly branched and anastomosing, with subglobose terminal cells; hypothecium colourless or pale brown in lower part. Asci 8-spored, cylindrical-clavate, Porpidia-type. Ascospores 1-celled, hyaline, ellipsoid, 19-35 x 8-17 µm, when young often with a gelatinous sheath, the wall I-. Pycnidia black, immersed at the top of papillae. Conidia bacilliform, 4.5-5 x 1-1.5 µm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-. Chemistry: traces of gyrophoric acid and 5-0-acethyl-4-methylhyascic acid.
Note: an arctic-alpine, circumpolar species found on periodically wetted, base rich siliceous rocks, with optimum near and above treeline; being often sterile, it might have been largely overlooked in the Alps.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by isidia, or isidia-like structures (e.g. schizidia)
Periodically submerged (e.g. in creeks)

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:

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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model
Herbarium samples


Curtis Randall Björk – CC BY-SA 4.0
British Columbia, Clearwater Valley, Dawson Falls Date: 2012-04-03 On river boulders in waterfall sprayzone


Pier Luigi Nimis CC BY-SA 4.0
Herbarium: TSB 9221



Juri Nascimbene - CC BY-SA 4.0
Mt. Adamello (Alps), Italy
2006



P.L. Nimis CC BY-SA 04
TSB 9221



P.L. Nimis CC BY-SA 04
TSB 35252