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Images of British Lichens

Cladonia borealis S.Stenroos

A member of the C. coccifera group, with neat, somewhat trumpet-shaped, grey-green or bluish-green podetia, exterior smooth or with cortex broken into small islands (areolate-corticate), soredia absent, podetial squamules sparse or more often lacking, interior of cup with flattened, corticate granules (much like the gemmae of the liverwort, Lunularia, and evidently rain-distributed in the same way), basal squamules relatively large, margins ascending, incised; pycnidia and apothecia bright red. Distribution imperfectly known but evidently a local or rare species of upland and exposed heaths in the north and west.

Refs: Stenroos (1980), 160-162 (line drawings); Nordic Lichen Flora (2013) 5: 22, 94 (photo); Smith et al. (2009), 325; Wirth (1995), 1: 298, 299 (photo); Krog et al. (1994), 149 (photo); Stenroos et al. (2011) 119 (photo); Hansen & Andersen (1995), 25 (photo); Brodo et al. (2001), 239, 241 (photo); Øvstedal & Lewis Smith (2001), 164, plate 30 (photo, but might be pleurota??); Lichen Atlas of the British Isles 2: 1748 (1996). [van Herk & Aptroot (2004, 2013), 130-131, and Aptroot et al. (2011), 48-9 (photos, podetia with large squamules, but morph accepted by Ahti & Stenroos in Nordic Lichen Flora)]


Cladonia borealis, close view
Cladonia borealis, close view
Cladonia borealis
By track in sandy pine (Pinus sylvestris) forest, Culbin Sands, Morayshire, August 2010 (BLS meeting)

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Uploaded March 2012, last updated January 2016