Bungartz F., Nash III T.H. & Ryan B.D.
(2004):
Morphology and anatomy of chasmolithic versus epilithic growth: a taxonomic revision of inconspicuous saxicolous Buellia species from the Sonoran Desert Region generally ascribed to the Buellia punctata group,
Canadian Journal of Botany,
82: 540-562
Six saxicolous species of Buellia, which were previously generally identified as Buellia punctata (Hoffm.)
A. Massal., were examined from the Sonoran Desert. None of the species belongs to Beullia punctata s. str. Though
inconspicuous, it can be demonstrated that the thallus morphology of these species is quite distinct and far less variable
than previously assumed. Most species are epilithic, even though their thalli also show some degree of substrate penetration.
Buellia sequax (Nyl.) Zahlbr., …
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