Cetraria ericetorum Opiz

Seznam Rostlin Kveteny Ceské: 173, 1852.
Synonyms: Cetraria crispa (Ach.) Nyl.; Cetraria crispa var. subnigricans Nyl.; Cetraria islandica f. subnigricans (Nyl.) Dalla Torre & Sarnth.; Cetraria islandica var. crispa Ach.; Cetraria islandica var. subtubulosa Fr.; Cetraria islandica var. tenuifolia (Retz.) Vain.; Cetraria subtubulosa (Fr.) Zopf; Cetraria tenuifolia (Retz.) R. Howe
Distribution: N - Frl (Tretiach & Hafellner 2000), Ven (Nascimbene & Caniglia 1997, 2003c, Caniglia & al. 1999), TAA (Caniglia & al. 2002, Nascimbene & al. 2005, 2006, Nascimbene 2008b, Lang 2009, Bilovitz & al. 2014, 2014b), Lomb (Rossi & al. 1998, Dalle Vedove & al. 2004), Piem (Morisi & Sereno 1995, Isocrono & al. 2004, Morisi 2005), VA (Verger & al. 1993, Borlandelli & al. 1996, Piervittori & Isocrono 1997, 1999, Valcuvia 2000, Piervittori & al. 2001, 2004, Isocrono & al. 2008), Emil (Fariselli & al. 2020). C - Umb (Genovesi & al. 2002, Ravera & al. 2006), Abr (Nimis & Tretiach 1999, Brackel 2015, Di Nuzzo & al. 2021, Gheza & al. 2021), Mol (Caporale & al. 2008).
Description: Thallus subfoliose to subfruticose, loosely attached, consisting of dorsiventral, flattened, ascending to erect, strongly channelled and more or less tubular, curved, 0.5-1 mm wide, up to 8-9 cm tall (usually much less), often sparingly branched laciniae bearing short (0.1-0.5 mm), marginal, pycnidia-bearing spinulose ourgrowths. Upper surface more or less dark brown, paler in shade-forms, smooth and somehow shiny, the basal parts often reddish; lower surface usually paler, with elongate pseudocyphellae restricted to the margins, particularly evident in the apical parts. Cortex 1-2-layered, with an external layer of thick-walled, paraplectenchymatous cells, and an inner layer of periclinally arranged hyphae; medulla white. Apothecia extremely rare (never found in Italian material), lecanorine, with a brown disc. Asci 8-spored, clavate, Lecanora-type. Ascospores 1-celled, hyaline, ellipsoid 5-9 x 2-4 μm. Pycnidia dark, immersed in the spinules. Conidia fusiform, multiseptate, colourless, 6-7.5 x c. 1 μm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: medulla with lichesterinic and protolichesterinic acids.
Note: an arctic-alpine, circumpolar species, with optimum on wind-exposed ridges on siliceous substrata near or above treeline; common throughout the Alps, but much rarer than C. islandica in the Apennines.
Growth form: Fruticose

Substrata: soil, terricolous mosses, and plant debris
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by thallus fragmentation

Commonnes-rarity: (info)

Alpine belt: very common
Subalpine belt: rather rare
Oromediterranean belt: absent
Montane belt: absent
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
Herbarium samples

Einar Timdal - Source: http://nhm2.uio.no/lav/web/index.html - CC BY-NC

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (9362)

Triin Aimla; Owner: University of Tartu

Leif Stridvall - Source: http://www.stridvall.se/la/galleries.php

Curtis Randall Björk – CC BY-SA 4.0
British Columbia, Boundary Ranges Date: 2013-07-04

Hillmann J. 1936. Parmeliaceae. In: Rabenhorst’s Kryptogamen-Flora von Deutschland, Österreich und der Schweiz. 2nd, IX, Die Flechten, Abt. 5, 3. Borntraeger\Leipzig, pp. 1-309.
As C. tenuifolia f. subtubulosa