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Two new Crypthonia species and a new Syncesia from Chapada do Araripe, Ceará, NE Brazil (Ascomycota: Arthoniales), with a key to Crypthonia

Published online by Cambridge University Press:  23 August 2013

Aline Anjos MENEZES ,
Amanda Barreto XAVIER-LEITE ,
Katia Almeida de JESUS ,
André APTROOT  and
Marcela Eugenia da Silva CÁCERES
Aline Anjos MENEZES
Affiliation:
Programa de Pós-Graduação em Ecologia e Conservação, Universidade Federal de Sergipe, CEP: 49100-000, São Cristóvão, Sergipe, Brazil
Amanda Barreto XAVIER-LEITE
Affiliation:
Programa de Pós-Graduação em Ecologia e Conservação, Universidade Federal de Sergipe, CEP: 49100-000, São Cristóvão, Sergipe, Brazil
Katia Almeida de JESUS
Affiliation:
Departamento de Biociências, Universidade Federal de Sergipe, CEP: 49500-000, Itabaiana, Sergipe, Brazil
André APTROOT*
Affiliation:
ABL Herbarium, G.v.d.Veenstraat 107, NL-3762 XK Soest, The Netherlands. Email: andreaptroot@gmail.com
Marcela Eugenia da Silva CÁCERES
Affiliation:
Departamento de Biociências, Universidade Federal de Sergipe, CEP: 49500-000, Itabaiana, Sergipe, Brazil
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Abstract

Two new species of the small genus Crypthonia are described from the Chapada do Araripe, an isolated table mountain in the state of Ceará, in NE Brazil. Both share the thallus and ascoma organization with the other known species of the genus, and are mainly characterized by differences in ascospores and chemistry. Crypthonia lichexanthonica A. A. Menezes, M. Cáceres & Aptroot has 7-septate ascospores and contains lichexanthone in the thallus, and C. submuriformis A. A. Menezes, M. Cáceres & Aptroot has (sub)muriform ascospores and also contains lichexanthone, but only in the ascigerous areas. A key to all known species of the genus Crypthonia is provided, in which Crypthonia olivacea Frisch & G. Thor is newly reported from Argentina. The new species Syncesia byssolomoides A. A. Menezes, M. Cáceres & Aptroot is described from the same area. It also has a thin byssoid thallus, but differs by the narrowly fusiform ascospores and by containing psoromic acid. It differs from all Syncesia species by the absence of carbonization and the presence of psoromic acid. The epiphytic lichen flora in this Caatinga forest area is dominated by crustose lichens, with Graphis and Polymeridium as the most speciose genera.

Keywords

ArthoniaceaecorticolouslichenslichexanthoneRoccellaceaetaxonomy
Type
Articles
Information
The Lichenologist , Volume 45 , Issue 5 , September 2013 , pp. 657 - 664
Copyright
Copyright © British Lichen Society 2013 

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