Katalog - Lichenological literature

16511

Vila B., Lamy D. & Verlaque R. (2010): R. Dughi et les collections de Lichens du Muséum d'Histoire Naturelle d'Aix-en-Provence: une source de matériel et de documentation oubliés, Cryptogamie, Mycologie, 31(1): 97-112

In botany, herbariums constitute the material support that is indispensable for any scientific study. However, the contents of numerous collections often remain unknown, to the detriment of knowledge and of the conservation of the natural patrimony. This article proposes an inventory of the herbariums of lichens in the natural history museum of Aix-enProvence and of the works in which they were studied in order to extract the scientific and historie data they contain. These collections, with … Read more...

26457

Vila J., Mollinedo P. & Sterner O. (2011): Spectroscopic studies of lichen depsides and depsidones, Revista Boliviana de Química, 28(1): 28-34

A structural study of depsides and depsidones by 1H NMR and 13C NMR spectroscopy, in which assignments of all carbons/protons of compounds isolated from various lichens (Thamnolia vermicularis, Baeomyces roseus and Everniastrum cirrhatum) is reported. The compounds studied include thamnolic acid, decarboxythamnolic acid, baeomycesic acid, salazinic acid and atranorin. The assignments are based on variuos 1D and 2D NMR experiments, e.g. DEPT, COSY, HMQC and HMBC. Keywords: Lichen, depside, depsidone, … Read more...

20945

Vila J., Mollinedo P., Flores Y. & Sterner O. (2008): 1,3,7-trymethylguanine from the lichen Stereocaulon ramulosum, Revista Boliviana de Química, 25(1): 1-3

Chromatographic fractionation of an acetone extract of the lichen Stereocaulon ramulosum afforded 1,3,7- trimethylguanine (1), perlatolic acid (2), methyl β-orcinolcarboxylate (3), atranorin (4) and galactitol (5). The structures were elucidated using NMR spectroscopy and mass spectrometry. Key Words: Stereocaulon ramulosum; guanine; depside. Read more...

11928

Viles H. (1995): Ecological perspectives on rock surface weathering: towards a conceptual model, Geomorphology, 13: 21-35

A wide range of information is now available on the ecology of rock surface microorganisms (including bacteria, fungi and algae) and lichens and their role in weathering in particular locations. External environmental conditions as well as rock characteristics determine the type of rock surface community, and thus the style of biological weathering. A simple, preliminary conceptual m,,~del can be drawn, which relates biological weathering activity to an environmental stress gradient and which … Read more...

12427

Viles H. (1987): A quantitative scanning electron microscope study of evidence for lichen weathering of limestone, Mendip Hills, Somerset, Earth Surface Processes and Landforms, 12(5): 467-473

Many saxicolous lichens may cause physical and chemical weathering of limestone substrates, but their geomorphological importance has not been fully determined. A simple method of producing quantitative descriptions of lichen material and petrographic evidence of weathering using the SEM has been developed and tested on samples from the Mendip Hills, England. The technique reveals a variable and often sparse distribution of lichen material and associated weathering effects below a thin, clearly … Read more...

12182

Viles H.A. (2008): Understanding Dryland Landscape Dynamics: Do Biological Crusts Hold the Key?, Geography Compass, 2(3): 899-919

Understanding landscape dynamics in arid and semi-arid areas is becoming increasingly important, as global change threatens to upset linked ecological and geomorphological systems with potentially serous impacts on livelihoods and environments. Biological crusts (composed of lichens, algae, fungi and bacteria) cover many rock, soil and sediment surfaces in arid and semi-arid areas and provide a key to understanding future dryland landscape dynamics. Such crusts have been found to play a number … Read more...

21880

Viles H.A. (2012): Microbial geomorphology: A neglected link between life and landscape, Geomorphology, 157-158: 6-16

Whilst recognition is increasing that life and landscapes are intimately related, as evidenced by growing research into ecosystem engineering, biogeomorphology and allied topics, the microbial contribution to such interactions has been relatively neglected. A revolution in environmental microbiology, based on molecular techniques, is now driving a reconsideration of the role of microbial processes in geomorphology at all scales. Recent research illustrates the hitherto unknown microbial diversity … Read more...

22089

Viles H.A. & Cutler N.A. (2012): Global environmental change and the biology of heritage structures, Global Change Biology, 18: 2406-2418

Review. Keywords: biodeterioration, bioprotection, climate change, disturbance, Heritage conservation, soiling, stress. Read more...

23386

Vilhelm J. (1925): Poznámky o bryologické vegetaci v okolí Františkových Lázní, Časopis Národního Musea, Praha, 99: 105-106

W Bohemia, Cladonia rangiferina listed Read more...

9160

Vilhelm J. (1927): Edvin Bayer, Preslia, 5: 230-231