Lecidea plana (J. Lahm) Nyl.

Flora, 55: 552, 1872. Basionym: Lecidella plana J. Lahm in Körber - Parerga Lichenol.: 211, 1861.
Synonyms: Catillaria eximia Malme; Catillaria stromatoides H. Magn.; Lecidea enteromorpha (Flot.) Vain.; Lecidea latypea Ach. non auct.
Distribution: N - Ven, TAA, Lomb, Piem (Isocrono & al. 2004), VA (Piervittori & al. 2001, Matteucci & al. 2015c), Emil (Fariselli & al. 2020). C - Tosc, Sar.
Description: Thallus crustose, endosubstratic or thinly episubstratic, whitish to grey, granular to rarely rimose-areolate, often inconspicuous, without a distinct prothallus. Medulla white, I-. Apothecia lecideine, black, adnate, often confluent, 0.4-1.5(-2) mm across, with a slightly concave to slightly convex, usually epruinose disc, and a thin, entire or sinuous proper margin. Proper exciple green-black to blue green in outer part, yellowish grey and filled with minute crystals within, of radiating, thin-walled, 3-5 µm thick hyphae; epithecium green to green-black, intensifying green in K, N+ purple; hymenium colourless, 35-50 μm high; paraphyses coherent, simple or rarely branched, 2-3 µm thick at mid-level, the apical cell 4-5 µm wide, with a dark green cap; hypothecium colourless or pale yellowish brown, of vertically arranged hyphae, 50-80 μm high, I+ blue. Asci 8-spored, clavate, Lecidea-type. Ascospores 1-celled, hyaline, ellipsoid, sometimes pseudodiblastic (containing 2 large oil droplets), 8-11(-13) x 2.5-4.5(-5) μm. Photobiont chlorococcoid. Spot tests: thallus and medulla K-, C-, KC-, P-, UV-. Chemistry: planaic acid (major), sometimes traces of 4-0-demethylp1anaic acid.
Note: a circumpolar, arctic-alpine to boreal-montane lichen (Hertel 2006) found on acid siliceous rocks, often on iron-rich substrata, on low boulders
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Species of metal-rich rocks

Commonnes-rarity: (info)

Alpine belt: common
Subalpine belt: rather common
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

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

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