Images of British Lichens
Loxospora elatina (Ach.) A.Massal.
Thallus a thin, effuse, pale grey crust, surface smooth to minutely warted, with convex, irregularly arranged and often confluent, yellow- to blue-green soralia, testing bright yellow with potassium hydroxide (K+ yellow); apothecia considered very rare, disks blood-red or red-brown, margins thalline, sorediate. On acid tree bark, generally in damp or old woodland, widespread but much more frequent in north-west Scotland.
Refs: Smith et al. (2009), 564; Purvis et al. (1992), 266 (as Haematomma elatinum); Dobson (2005), 257 (photo); Dobson (2011), 263 (photo); Whelan (2011), 115 (photo); Wirth (1995), 2: 566 (photo); Wirth, Hauck & Schulz (2013), 2: 716 (photo); Holien & Tønsberg (2008), 170 (photo).
Can be confused with other sorediate species but in most cases is separable by the K+ yellow soralia. Lecanora jamesii can be similar and may occur together with Loxospora, but its soralia are at most weakly yellow with potassium hydroxide and they tend to be smaller and neater. Colour of soralia varies with dampness and may be less helpful than has been suggested.
|Damp material, on trunk of Western Hemlock (Tsuga heterophylla), Ardanaiseig, Argyllshire, December 2009|
|Material with apothecia, on dead wood (? Oak, Quercus), Ardilistry, Islay, May 2011, in dry weather (BLS meeting)|
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Uploaded September 2013