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Images of British Lichens



Opegrapha zonata Körb.
 
(= Enterographa zonata (Körb.) Källsten ex Torrente & Egea)


Thallus thin to moderately thick, violet-tinged chocolate-brown with a conspicuous, black marginal prothallus, usually speckled with dot-like dark brown soredia that become abraded and paler; apothecia black, lirellate, rounded or ellipsoid, rare, ascospores 5-7(-11) septate, 24-28(-32) × 3.5-6 µm (dimensions from Pentecost & James, in Smith et al., 2009). Widespread and locally frequent, mainly in the north and west, forming mosaics on sheltered and shaded rock surfaces, generally in humid situations under overhangs, rarely on shaded bark.

Refs: Smith et al. (2009), 646; Purvis et al. (1992), 415; Dobson (2005), 170 (as Enterographa); Dobson (2011), 176 (as Enterographa); Wirth (1995), 1: 385 (photo, as Enterographa); Wirth, Hauck & Schulz (2013), 1: 114 & 466 (photos, as Enterographa); Holien & Tønsberg (2008), 199 (photo); Puntillo (1996), plate 17 (photo, as Enterographa).

 
Opegrapha zonata
Opegrapha zonata
Opegrapha zonata, mosaic with O. gyrocarpa
On shaded basalt rockface under overhang, Traprain Law, East Lothian, June 2011, lowest photograph shows mosaic with O. gyrocarpa (orange-brown).


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© A.J. Silverside
uploaded February 2014