Obermayer W. & Poelt J.
(1992):
Contributions to the knowledge of the lichen flora of the Himalayas III. On Lecanora somervellii Paulson (lichenized Ascomycotina, Lecanoraceae),
Lichenologist,
24(2): 111-117
The lichen Lecanora somervellii Paulson, first described from the
northern slopes of Mt Everest in Tibet, has been collected at four other localities in
the High Himalayas, at altitudes between 3750 and 5540 m. As the type material
appears to be missing, a neotype is designated here. The species has an unusual
lemon yellow colour due to the pigment calycin; this compound is in addition to usnic
acid, which is widespread in Lecanora. Lecanora somervellii is otherwise very similar
in essential …
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