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Net photosynthesis (NP) and dark respiration (DR) of thalli of the lichen speciesUmbilicaria griseaandU. freyigrowing together in the same habitat in the Sierra de Guadarrama, central Spain, were measured under controlled conditions in the laboratory and under natural conditions in the field over a range of photosynthetic photon flux densities (PPFD), thallus temperatures and thallus water contents...
Early stages of lichen colonization on glass are reported for the first time from Antarctica. In the initial establishment of the lichen thallus rhizomorphs play an important role for the attachment to the substratum and the exploitation of nutrient and photobiont resources. The micrographs presented indicate that in Antarctica colonization of bare substrata by lichens is not necessarily an extremely...
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