Previous page Next page
 
lastdragon.org

Images of British Lichens



Opegrapha atra Pers.


Thallus thin, white to grey; fruitbodies elongated, sinuous or branched, lirellate apothecia up to 2mm in length, generally crowded and often oriented partly in parallel, disc slit-like, pycnidia rare. Part of a difficult genus commonly requiring microscopic examination of the spores for accurate identification, ascospores 3-septate, narrowly ellipsoid or club-shaped, 13-18(-20) × 2.5-4(-5) µm (dimensions from Pentecost & James, in Smith et al., 2009). Widespread and locally common on sheltered, smooth bark.

Refs: Smith et al. (2009), 636; Purvis et al. (1992), 407; Dobson (2005), 289 (photo); Dobson (2011), 292 (photo); Jahns (1983), 258-9 (photo); Whelan (2011), 119 (photo); van Herk & Aptroot (2004, 2013), 266-267 (photo); Wirth (1995), 2: 622; Wirth et al. (2004), 274 (photo); Moberg & Holmåson (1984), 217 (photo); van Haluwyn et al. (2009), 176-7 (photo); Valcárcel et al. (2003), 258-9 (photo); Puntillo (1996), plate 26 (photo).

 
Opegrapha atra
Opegrapha atra, enlarged view
On Ash (Fraxinus excelsior), Brotherston, Pembrokeshire, May 2009


Previous page   Next page



Lichens HOME PAGE | Index of Species | Conditions of Use and e-mail contact | References | Site Home Page


© A.J. Silverside
Uploaded February 2014