Lecidea praenubila Nyl.

Flora, 55: 21, 1873.
Synonyms: Lecidea aeneola (Arnold) Vain.; Lecidea atrocervina Vain.
Distribution: N - TAA (Caniglia & al. 2002, Hertel & Schuhwerk 2010), VA (Piervittori & al. 2004).
Description: Thallus crustose, episubstratic, areolate, grey-brown with a slightly reddish tinge, delimited by a dark prothallus. Cortex with a distinct epinecral layer; medulla white, I+ blue-violet. Apothecia lecideine, black, closely adnate, not overtopped by the areoles, with a flat to slightly convex, usually epruinose disc, and a raised, usually persistent proper margin. Proper exciple of parallel-radiating hyphae, green-black in outer part, colourless or very pale brown within; epithecium bright green or olive-green; hymenium colourless, 47-92 μm high; paraphyses conglutinated, usually simple, rarely anastomosing; hypothecium pale brown. Asci 8-spored, clavate, Lecidea-type. Ascospores 1-celled, hyaline, ellipsoid, 9.2-16.2 x 5-7.8 μm. Photobiont chlorococcoid. Spot tests: K+ yellowish, C-, KC- P+ yellow-orange. Chemistry: thallus with stictic acid.
Note: an arctic-alpine to boreal-montane, perhaps circumpolar silicicolous species found on horizontal surfaces or on pebbles; much rarer in the Alpine belt of the Alps than in northern Europe; closely related to L. paupercula.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: very rare
Subalpine belt: extremely 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:

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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

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


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