Collection location: Parque de Monsanto, Lisboa, Portugal [Click for map]
The overall appearance of this fertile specimen is similar to that of my previous observations of Pyrrhospora quenea. However, the thallus is not as granulose as usual, being more farinose; The chemistry also differs, not reacting C+ orange and remaining C-. To try to learn more about this specimen I tried the microscopy. This revealed at the initial stage, while preparing the slide, a red reaction caused by some soluble substance in NH4OH. The spores are very small (so no precise values for their dimensions are possible), broadly elipsoid to subglobose allocated in asci (at least seeming) of Lecanora type. This clearly points to Pyrrhospora. According to the British Flora the only alternative to P. quernea in this genus is P. rubiginans, which lives on rock. Thus I think this is again P. quernea.
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which I thought to had already uploaded.
The presence of xanthones (C+ and KC+ orange) is supposed to be invariable in P. quernea. You are fortunate to have a specimen with a number of well-developed apothecia. I admit that I can’t recommend an alternative genus, though.
Created: 2012-10-19 15:09:04 PDT (-0700)
Last modified: 2012-10-19 15:35:42 PDT (-0700)
Viewed: 25 times, last viewed: 2018-03-09 15:54:39 PST (-0800)