Les Apothecies et les Asques du Parmelia conspersa (Discolichen Parmeliacee)

1970 ◽  
Vol 73 (1) ◽  
pp. 39 ◽  
Author(s):  
Marie-Agnes Letrouit-Galinou
Keyword(s):  
Parmelia Conspersa

The Weathering of Mafic Rocks by Lichens

1993 ◽  
Vol 25 (3) ◽  
pp. 285-297 ◽  
Author(s):  
P. Adamo ◽  
A. Marchetiello ◽  
P. Violante
Keyword(s):  
Oxalic Acid ◽  
Chemical Substance ◽  
Mineral Surfaces ◽  
Secondary Products ◽  
Mafic Rocks ◽  
Crustose Lichens ◽  
Parmelia Conspersa

AbstractThe weathering phenomena resulting from the growth of six foliose and crustose lichens (Parmelia subrudecta, Xanthoria ectaneoides, Parmelia conspersa, Aspicilia radiosa, Caloplaca sp. and Ochrolechia parella) on three mafic rocks have been studied. The bioweathering results in more or less extensive fragmentation and corrosion of the mineral surfaces immediately beneath the lichen thalli and in the formation, in the thallus or at the rock-lichen interface, of secondary products. The significant amounts of whewellite found in all interfaces, and the bipiramids of weddellite detected at the serpentine rock-Ochrolechia parella interface, suggest that the oxalic acid secreted by the mycobiont is the chemical substance principally involved. The capacity of the lichens to alter their rock substrata does not appear to be related to their thallus morphology.

Chemistry of Australian Lichens. I. Some Constituents of Parmelia conspersa (Ehrh.) Ach., Ramalina fraxinea (L.) Ach., Usnea barbata (L.) Wigg., and U. ceratina Ach., from the New England Region

1960 ◽  
Vol 13 (2) ◽  
pp. 277 ◽  
Author(s):  
GP Briner ◽  
GE Gream ◽  
NV Riggs
Keyword(s):  
New England ◽  
Usnic Acid ◽  
Water Soluble ◽  
The World ◽  
Parmelia Conspersa ◽  
Soluble Fractions

Each of the species named in the title has yielded (+)-usnic acid, as found in previous investigations in other parts of the world. Other aromatic constituents isolated, except salazinic acid from Parmelia conspersa differ from those previously reported and include a new compound from P. conspersa. It is suggested that usnaric acid, previously obtained from Usnea spp. but unidentified, was a mixture of salazinic and norstictic acids. D-Mannitol or D-arabitol has been isolated from the water-soluble fractions.

A lichen (Parmelia conspersa) surviving with elevated concentrations of lead and copper in the center of Sendai city

1975 ◽  
Vol 14 (6) ◽  
pp. 726-730 ◽  
Author(s):  
Morito Saeki ◽  
Kiyoshi Kunii ◽  
Toshihiko Seki ◽  
Tsuguyoshi Suzuki
Keyword(s):  
Parmelia Conspersa
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