Bungartz, F., U. Grube, J. A. Elix, C. Heininger & H. Mayrhofer 2011: A taxonomic revision of the Buellia subalbula-group in the Southern Hemisphere using fluorescence microscopy. - In: S. A. Bates (ed.): Biomonitoring, Ecology, and Systematics of Lichens: Festschrift Thomas H. Nash III. Bibliotheca Lichenologica No. 106. J. Cramer in der Gebr. Borntraeger Verlagsbuchhandlung, Stuttgart, pp. Pp. 21-39. [RLL List # 223 / Rec.# 32834]
Abstract: Four species of the Buellia subalbula-group are recognized in the Southern Hemisphere. Buellia albula is widely distributed on calcareous rocks in southern and temperate Australia and in New Zealand. The new species Buellia xantholeuca also occurs on calcareous rocks and is sometimes associated with B. albula. It is only known from south-western Western Australia and South Australia. Buellia follmannii and B. subalbula are known from the Namib and neighboring areas in southern Africa and from the Atacama in South America; Buellia subalbula is also for the first time reported from Australia. All species are described in detail. Fluorescence microscopy has been used for the detection of secondary compounds in addition to HPTLC, TLC and HPLC. The former technique was extremely usefulfor observing secondary metabolites which might otherwise be overlooked, even with highly sensitive chemical analysis techniques. One possible reason may be sparse, patchy occurrence of the secondary metabolites, and on calcareous substrates it is also likely that xanthones can only be detected as traces if they are largely bound as acetone-insoluble calcium salts.
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Current date: 2024.04.29.OK