Lepra borealis


Lepra borealis

(Erichsen) I. Schmitt, Hodkinson & Lumbsch (2017)
Pertusaria borealis
Conservation Status
LC NS Sc IR (Key)
BLS Number
General Description

Description from Cannon et al (2021) below.


Thallus thin to thick, pale grey to pale green-grey, continuous, often fissured; prothallus indistinct; soralia mostly delimited, rounded, convex, rarely excavate, to 1.5 (–3) mm diam., occasionally fused; soredia white, coarse. Apothecia rare, developing within soralia, disciform, single-pored; disc pale pink, to ca 0.7 mm diam. Ascospores 6 per ascus, 18–20 × 10–14 um; Thallus C–, K+ brownish, Pd+ red (fumarprotocetraric, protocetraric and succinprotocetraric (trace) acids). 

Pertusaria pupillaris, from similar habitats, is ± immersed in bark and lacks succinprotocetraric acid. Lepra amara has KC+ violet soralia and a very bitter taste.


On old Pine lignum, in Caledonian Pine forest

Distribution Map
Key to map date classes

Rare, Scottish Highlands

Threats & Status

Confined to well lit dead wood in native pinewoods, where it may be vulnerable to overgrowth and shading by coarse vegetation if grazing levels are greatly reduced.

Britain: Notable & International Responsibility species 

Scotland:  Priority Taxon for Biodiversity in Scotland


Cannon, P., Kukwa, M., Coppins, B., Fletcher, A., Sanderson, N. & Simkin, J. (2021). Pertusariales: Ochrolechiaceae, including the genera Lepra, Ochrolechia and Varicellaria. Revisions of British and Irish Lichens 5: 1-17. Link