caa a22 4500 465763340 CHVBK 20180323111905.0 cr unu---uuuuu 170327e19901201xx s 000 0 eng 10.1007/BF00236519 doi (NATIONALLICENCE)springer-10.1007/BF00236519 The weathering action of saxicolous lichens in maritime Antarctica [Elektronische Daten] [C. Ascaso, L. Sancho, C. Rodriguez-Pascual] Summary: Xanthoria elegans (Link) Th Fr. and Lecidea lapicida (Ach.) were studied on volcanic andesite, and Rhizocarpon geographicum (L.) DC. and Bacidia stipata Lamb on a volcanigenic sediment, using light microscopy, infrared spectroscopy, X-ray diffraction and transmission electron microscopy. Feldspars were present in the rocklichen interface to a lesser extent than in the underlying rock. R. geographicum was found to alter the minerals in the rock on which it grew without producing any new minerals in the rock/lichen interface, in contrast to the observations for this species on granite in temperate regions. Beneath of the thallus of L. lapicida there was calcium oxalate and some micas of the illite type, which may have been degradation products of various phyllosilicates in the rock. B. stipata, an endemic Antarctic lichen, had the greatest capacity to weather the rock and had weddellite (dihydrate calcium oxalate) and calcite in the contact area as well as many bacteria. The presence of crystalline oxalate, imogolite, allophane, carbonates (calcite) and amorphous material not found in the parent rock indicates biomineralization processes attributable to the lichens. Springer-Verlag, 1990 Ascaso C. Instituto de Edafología y Biología Vegetal, Serrano 115 bis, E-28006, Madrid, Spain aut Sancho L. Departamento de Biología Vegetal II, Facultad de Farmacia, U.C.M., E-28040, Madrid, Spain aut Rodriguez-Pascual C. Instituto de Edafología y Biología Vegetal, Serrano 115 bis, E-28006, Madrid, Spain aut Polar Biology Springer-Verlag 11/1(1990-12-01), 33-39 0722-4060 11:1<33 1990 11 300 https://doi.org/10.1007/BF00236519 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00236519 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ascaso C. Instituto de Edafología y Biología Vegetal, Serrano 115 bis, E-28006, Madrid, Spain aut NATIONALLICENCE 700 1- Sancho L. Departamento de Biología Vegetal II, Facultad de Farmacia, U.C.M., E-28040, Madrid, Spain aut NATIONALLICENCE 700 1- Rodriguez-Pascual C. Instituto de Edafología y Biología Vegetal, Serrano 115 bis, E-28006, Madrid, Spain aut NATIONALLICENCE 773 0- Polar Biology Springer-Verlag 11/1(1990-12-01), 33-39 0722-4060 11:1<33 1990 11 300 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer