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Molecular phylogeny and status of Diploicia and Diplotomma, with observations on Diploicia subcanescens and Diplotomma rivas-martinezii

Published online by Cambridge University Press:  28 March 2007

María del Carmen Molina
Affiliation:
M. del C. Molina (corresponding author): Departamento de Ciencias Experimentales e Ingenieria, Escuela Superior de Ciencias Experimentales y Tecnologia, Universidad Rey Juan Carlos, Madrid 28933, Spain.
Ana Crespo
Affiliation:
A. Crespo, O. Blanco & D. L. Hawksworth: Departamento de Biología Vegetal II, Facultad de Farmacia, Universidad Complutense, Madrid 28040, Spain.
Oscar Blanco
Affiliation:
A. Crespo, O. Blanco & D. L. Hawksworth: Departamento de Biología Vegetal II, Facultad de Farmacia, Universidad Complutense, Madrid 28040, Spain.
Néstor Hladun
Affiliation:
N. Hladun: Departament de Biologia Vegetal (Botanica), Universitat de Barcelona, Av. Diagonal 645, Barcelona 08028, Spain.
David L. Hawksworth
Affiliation:
A. Crespo, O. Blanco & D. L. Hawksworth: Departamento de Biología Vegetal II, Facultad de Farmacia, Universidad Complutense, Madrid 28040, Spain.

Abstract

ITS rDNA sequence data shows that Diploicia and Diplotomma species form a monophyletic clade distinct from other Buellia species. This indicates that Diplotomma merits acceptance as a genus, and suggests that Diploicia should be treated as a synonym of Diplotomma, the earlier name. The data also shows Diploicia subcanescens, considered the fertile counterpart in a species pair with D. canescens, is nested within D. canescens and should be treated as a synonym despite reported chemical differences. In addition, the molecular data support the distinctness of Diplotomma rivas-martinezii, a species restricted to gypsum rocks in Spain, from the widespread D. venustum, which grows on calcareous rocks. Aposymbiotic cultures suggest that D. rivas-martinezii also differs from D. venustum in its germination and isolation success rates. One new combination is made: Diplotomnta pulverulenta (Anzi) D. Hawksw. (syn. Abrothallus pulverulentus Anzi) for the lichenicolous species previously known as Buellia pulverulenta.

Type
Research Article
Copyright
Copyright © British Lichen Society 2002

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