Lepraria borealis Loht. & Tønsberg

Ann. Bot. Fenn., 31: 224, 1994.
Distribution: N - Frl (Baruffo & al. 2006), TAA (Ravera & al. 2019b), Piem (Baruffo & al. 2006), VA (Baruffo & al. 2006), Emil (Baruffo & al. 2006, Fariselli & al. 2020). C - Tosc (Baruffo & al. 2006, Benesperi & al. 2007), Sar (Baruffo & al. 2006).
Description: Thallus leprose, whitish to whitish grey, up to 0.7 mm thick, consisting in a mass of soredia-like granules, usually well-delimited, sometimes indistinctly sublobate at margin. Medulla white, thin. Granules rather firmly attached, coarse, 60-260 μm in diam., with a compact surface, rarely with a few, short projecting hyphae; consoredia few to abundant, typically 200–300 μm in diam. Photobiont chlorococcoid. Spot tests K+ yellow, C-, KC-, P+ yellowish, UV-. Chemistry: atranorin, rangiformic acid (major), norrangiformic acid (traces).
Note: a circumboreal species growing on siliceous rocks and over epilithic mosses, with optimum in the oroboreal to Alpine belts of the Alps, but also occurring in the high Mediterranean mountains.
Growth form: Leprose
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)

Commonnes-rarity: (info)

Alpine belt: rather rare
Subalpine belt: rather rare
Oromediterranean belt: extremely rare
Montane belt: very rare
Submediterranean belt: extremely rare
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

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