According to the reference given the two species M. subaurifera and M. fuliginosa subsp. glabratula usually live together or closely, as is the case of the specimens in this observation and of MO77576.
They differ morphologically as follows:
- M. fuliginosa subsp. glabratula:
Thallus green to warm brown (not dark brown as in Dobson key), shining, older parts with few to abundant cylindrical or branched-coralloid isidia reaching 0.8mm or more in height, leaving white scars when rubbed off. On deciduous tree bark and fences, rarely rocks, generally common throughout Britain.
- Melanelixia subaurifera:
Thallus green to dull brown, matt to moderately shiny, surface with sparse to clustered punctate soralia and soft, globose isidia about 0.2mm (to 0.4mm) in height, leaving white or yellow scars when rubbed off. On trees, especially the smaller branches and twigs, rarely rocks, generally common throughout Britain.
I think that the thallus of these specimens is greener and more shining than the one in MO77577 and, on the other hand, lack soredia (as far as I can see). Thus, I think that this is M. fuliginosa subsp. glabratula.
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Created: 2011-09-29 16:10:23 CDT (-0500)
Last modified: 2011-09-29 16:21:43 CDT (-0500)
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