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Isalonactis, a new genus of Roccellaceae (Arthoniales), from southern Madagascar

Published online by Cambridge University Press:  11 February 2014

Damien ERTZ ,
Anders TEHLER ,
Eberhard FISCHER ,
Dorothee KILLMANN ,
Tahina RAZAFINDRAHAJA  and
Emmanuël SÉRUSIAUX
Damien ERTZ*
Affiliation:
Jardin Botanique National de Belgique, Département Bryophytes-Thallophytes, Domaine de Bouchout, B–1860 Meise, Belgium. Email: [email protected]
Anders TEHLER
Affiliation:
Naturhistoriska riksmuseet, Enheten för kryptogambotanik, Box 50007, S-104 05 Stockholm, Sweden
Eberhard FISCHER
Affiliation:
Institute for Integrated Natural Sciences, Department of Biology, University of Koblenz-Landau, Universitätstraße 1, D-56070 Koblenz, Germany
Dorothee KILLMANN
Affiliation:
Institute for Integrated Natural Sciences, Department of Biology, University of Koblenz-Landau, Universitätstraße 1, D-56070 Koblenz, Germany
Tahina RAZAFINDRAHAJA
Affiliation:
Département Botanique, Parc de Tsimbazaza, B.P. 4096, Antananarivo 101, Madagascar
Emmanuël SÉRUSIAUX
Affiliation:
Evolution and Conservation Biology, University of Liège, Sart Tilman B22, B-4000 Liège, Belgium
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Abstract

The new genus and species Isalonactis madagascariensis is characterized by a crustose, non-corticate, often sorediate thallus containing psoromic acid, tiny white pruinose ascomata with a thalline margin, an inconspicuous excipulum, a pale brown hypothecium, 3-septate hyaline ascospores and curved filiform conidia. Phylogenetic analyses using nuLSU and RPB2 sequences place Isalonactis in the Roccellaceae, close to the genera Lecanactis and Chiodecton. The new species was collected on sheltered siliceous rocks in the dry landscape of the Isalo Massif (S Madagascar). Dermatiscum thunbergii is newly recorded from Madagascar.

Keywords

AfricaArthoniomycetesdesertLecanactislichenphylogenytaxonomy
Type
Articles
Information
The Lichenologist , Volume 46 , Issue 2 , March 2014 , pp. 159 - 167
Copyright
Copyright © British Lichen Society 2014 

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