Lecanora aitema (Ach.) Hepp

Flecht. Eur.: nr. 69, 1853. Basionym: Lecidea aitema Ach. - K. Vetensk.-Akad. Nya Handl., 29: 261, 1808.
Synonyms: Lecanora symmicta var. aitema (Ach.) Th. Fr.; Lecanora symmicta var. saepincola (Ach.) Nyl.; Lecanora symmictera var. aitema (Ach.) Nyl.
Distribution: N - Frl, TAA (Dalla Torre & Sarnthein 1902, Nascimbene & al. 2007b), Lomb, Piem (Isocrono & al. 2004). C - Tosc.
Description: Thallus crustose, episubstratic, granular to irregularly areolate, dispersed or continuous, white to yellowish white, forming small patches. Apothecia distinctly lecanorine only when young, but soon appearing biatorine, sessile, 0.2-0.5 mm across, with a dark green, red-brown, olive-black or black (often piebald), strongly convex, epruinose disc, and a thin, smooth, soon excluded thalline margin. Epithecium yellowish brown to olive-green, with granules dissolving in K; hymenium colourless, 55-80 µm high; paraphyses branched and anastomosing, 2-2.5 µm thick, the apical cells only slightly swollen, up to 3.5 µm wide; hypothecium colourless. Asci 8-spored, clavate, very thin-walled, with a K/I+ blue, tall tholus penetrated by a faintly amyloid apical cushion, the wall K/I-, surrounded by a blue outer layer, Lecanora-type. Ascospores 1-celled, hyaline, narrowly ellipsoid, (10-)12-17 x 4.5-5.5 µm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC+ faintly yellow, P-, UV+ pale orange. Chemistry: usnic acid, zeorin.
Note: on twigs of Calluna and other shrubs, more rarely on lignum and bark of coniferous trees and oaks. Closely related to L. symmicta, this species is included in the Italian red list of epiphytic lichens as “Endangered” (Nascimbene & al. 2013c).
Growth form: Crustose
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: very rare
Oromediterranean belt: extremely rare
Montane belt: very 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

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

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


P. Czarnota, P. Osyczka and A. Kowalewska (2010) Status of some poorly known lichen species from the genus Lecanora (lichenized Ascomycota) in Poland. Mycotaxon

Mies, Bruno A. (2014) Neue und interessante Flechten (lichenisierte Ascomyceten) aus Eifel, Ardennen und Hunsruck. Delattinia https://nhm2.uio.no/botanisk/lav/RLL/PDF/S725.pdf