Showing papers by "Marcelo Pinto Marcelli published in 1999"
TL;DR: It is concluded that knowledge of the Argentinean lichen flora is patchy and depends on the accessibility of the study area and historical factors of each region, rather than on the phytogeographic area considered.
Abstract: This paper presents an assessment of the lichen taxa cited for Argentina, as related to botanical expeditions and in the context of their distribution both in the four vascular flora phytogeographic dominions and in geographic provinces. Three chronological periods are considered: the first, up to the middle of the 20th century, when Grassi published the Catalogue of Argentine Lichens (first catalogue of its kind in Latin America), the second, up to the 1970s and the third, up to the present. The work of Argentine research groups is discussed, including data from bibliographical sources and researchers’ personal communications. The relationship between contributions by local and foreign scientists is discussed. It is concluded that knowledge of the Argentinean lichen flora is patchy and depends on the accessibility of the study area and historical factors of each region, rather than on the phytogeographic area considered.
46 citations
TL;DR: The chemical structures of the glucans, galactoglucomannans and galactomannoglucans of two species of the Cladonia, section Cocciferae, Cladoni miniata and Cladania salmonea were determined and compared as mentioned in this paper.
Abstract: The chemical structures of the glucans, galactoglucomannans and galactomannoglucans of two species of the Cladonia , section Cocciferae , Cladonia miniata and Cladonia salmonea , were determined and compared. α- D -Glucans of the nigeran type were isolated from both species, in common with all Cladonia spp., along with galactoglucomannans containing (1→6)-linked main-chains of α- D -Man p units substituted by structurally different and typical side-chains. Isolated were previously unreported galactomannoglucans, with (1→3)-linked main-chains of β- D -Glc p units, substituted at O -2,6 by side-chains. These consisted of β- D -Gal f , 6- O -substituted β- D -Gal f and 2- O -, 4- O -, 6- O - and 2,3-di- O -substituted α- D -Man p units. According to 13 C NMR spectroscopy, a similar galactomannoglucan was isolated from the Cladonia spp. Cladonia signata, Cladonia crispatula, Cladonia penicillata, Cladonia imperialis, Cladonia clathrata, Cladonia connexa, Cladonia substellata and Cladonia ibitipocae . Its presence could also contribute to the classic taxonomy of lichenized fungi.
16 citations
2 citations