Chaenotheca cinerea (Pers.) Tibell

Symb. Bot. Upsal., 23, 1: 30, 1980. Basionym: Calicium cinereum Pers. - Ic. Descr. Fung. Minus Cogn., 2: 58, 1800.
Synonyms: Calicium schaereri De Not. non auct.; Chaenotheca albida (Körb.) Zahlbr.; Chaenotheca schaereri (De Not.) Zahlbr.
Distribution: N - Ven (Puntillo & Puntillo 2009), Lomb (Anzi, Lich. Rar. Langob. Exs. Nr. 204: S-L30504).
Description: Thallus crustose, episubstratic, granular-verrucose, grey-white, more rarely almost endosubstratic and poorly evident. Apothecia short-stalked, pin-like, 0.6-1 mm high, the stalk 0.07-0.12 mm thick, the upper part dark, but covered in a thick white pruina, the lower part pale brown to almost white. Outermost layer of stalk hyaline, consisting of periclinally arranged, strongly gelatinized hyphae. Capitulum 0.2-0.4 mm across, obovoid to obconical, with a well-developed exciple which is white-pruinose in lower part, the edge often with very irregular vertical splits. Inner part of exciple of periclinally arranged, medium brown hyphae, the outer part of irregularly intertwined, swollen and sclerotized hyphae; mazaedium well-developed, brown; hypothecium pale brown to colourless, with a concave upper surface. Asci ellipsoid or irregular, estipitate, formed in chains from hooked ascogenous hyphae, dissolving early, with uniseriately arranged spores. Ascospores 1-celled, brown, globose, 4.5-5.5 µm wide, the wall smooth or with irregular cracks. Photobiont chlorococcoid, with rectangular cells (Stichococcus). Spot tests: thallus K-, C-, KC-, P-. Chemistry: thallus with very low amounts of atranorin and other unidentified substances.
Note: a mild-temperate species found on the nutrient-rich bark of several trees (e.g. Acer, Fraxinus, Populus, Ulmus), in deep fissures of the bark seldom wetted by rain, with optimum at low elevations. Known from a few regions of the North but extremely rare and perhaps extinct. It is included as “Regionally Extinct” in the Italian red list of epiphytic lichens (Nascimbene & al. 2013c).
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
In underhangs rarely wetted by rain

Commonnes-rarity: (info)

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

pH of the substrata:

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Predictive model
Index Fungorum GBIF

Andres Saag CC BY-SA NC ND http://www.eseis.ut.ee/LichenPhoto_2200/Chaenotheca_cinerea_a1.jpg



Curtis Randall Björk – CC BY-SA 4.0
British Columbia, Clearwater Valley 2014-05-04 Corticolous, trunk of large Populus trichocarpa in humid old-growth forest


Andres Saag- CC BY-SA NC ND - Source: http://www.eseis.ut.ee/LichenPhoto_2200/Chaenotheca_cinerea_a1.jpg