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Calcium Oxalate and Medullary Architecture in Xanthomaculina Convoluta

Published online by Cambridge University Press:  28 March 2007

Paolo Modenesi
Affiliation:
Dipartimento per lo studio del Territorio e delle sue Risorse, University of Genova, Corso Dogali 1/C, 16136 Genova, Italy
Massimo Piana
Affiliation:
Dipartimento per lo studio del Territorio e delle sue Risorse, University of Genova, Corso Dogali 1/C, 16136 Genova, Italy
Paolo Giordani
Affiliation:
Dipartimento per lo studio del Territorio e delle sue Risorse, University of Genova, Corso Dogali 1/C, 16136 Genova, Italy
Alessandra Tafanelli
Affiliation:
Dipartimento di Ingegneria Strutturale e Geotecnica, Via Montallegro 1, 16145 Genova, Italy
Antonella Bartoli
Affiliation:
Via G. Civinini 20, 00141 Roma, Italy

Abstract

The anatomy of Xanthomaculna convolute shows adaptation to a vagrant life form and to the moisture conditions of its habitat. The differential swelling of the irregularly thickened upper cortex and the medulla, in addition to the rigid medullary structure, due to the deposition of calcium oxalate, allow orderly hygroscopic thalline movements. The architecture of the medulla appears to be closely related to masonry-like arches where the material is only stressed by compression and the stresses are distributed at the hinges. The possible role of crystalline medullary deposition as a radiation reflector is also suggested.

Type
Research Article
Copyright
Copyright © British Lichen Society 2000

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