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Three new Arthoniaceae from Chapada do Araripe, Ceará, NE Brazil

Published online by Cambridge University Press:  07 August 2014

Marilia Muryel Estevam ALVES ,
André APTROOT ,
Sírleis Rodrigues LACERDA  and
Marcela Eugenia da Silva CÁCERES
Marilia Muryel Estevam ALVES
Affiliation:
Laboratório de Botânica, Universidade Regional do Cariri, CEP: 63100-000, Crato, Ceará, Brazil
André APTROOT*
Affiliation:
ABL Herbarium, G.v.d.Veenstraat 107, NL-3762 XK Soest, The Netherlands. Email: andreaptroot@gmail.com
Sírleis Rodrigues LACERDA
Affiliation:
Laboratório de Botânica, Universidade Regional do Cariri, CEP: 63100-000, Crato, Ceará, Brazil
Marcela Eugenia da Silva CÁCERES
Affiliation:
Departamento de Biociências, Universidade Federal de Sergipe, CEP: 49500-000, Itabaiana, Sergipe, Brazil
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Abstract

Three new corticolous Arthoniaceae are described from the Chapada do Araripe, an isolated table mountain in the state of Ceará, in NE Brazil. Arthonia stipitata, lichenicolous on unidentified sorediate crusts, with red, tiny, stipitate apothecia, 3-septate ascospores, 10–12×3·0–3·5 µm. Stirtonia lucida with rather small ascigerous areas, lichexanthone and zeorin in the thallus, globose asci, ascospores 8 per ascus, ellipsoid, 17–19×8–10 µm, with occasionally some longitudinal septa. Stirtonia ochracea with rather small ochraceous ascigerous areas, thallus without secondary metabolites, ascospores 8 per ascus, (7–)9(–11)-septate, 47–55×14–20 µm. These species were found during a study aiming at an inventory of the lichen biodiversity of the Cerrado forests in the area, and were not found during earlier ecological studies in the Caatinga forests in the same area. Stirtonia lucida is the first species assigned to this genus which occasionally has some longitudinal septa in the ascospores. Such specimens might be confused with Cryptothecia species.

Keywords

ArthoniaArthonialesCerradocorticolouslichensStirtonia

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Type
Articles
Information
The Lichenologist , Volume 46 , Issue 5 , September 2014 , pp. 663 - 667
Copyright
Copyright © British Lichen Society 2014 

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