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Bacidia Caesiovirens, A New Lichen Species from Western Europe

Published online by Cambridge University Press:  28 March 2007

Stefan Ekman  and
Håkon Holien
Stefan Ekman
Affiliation:
Department of Systematic Botany, University of Lund, Östra Vallgatan 18–20, S–223 61 Lund, Sweden
Håkon Holien
Affiliation:
Department of Botany, Museum of Natural History and Archaeology, University of Trondheim, N–7004 Trondheim, Norway
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Abstract

Bacidia caesiovirens S. Ekman & Holien sp. nov. is described from Norway, and the British Isles. It occurs on trunks of deciduous trees in coastal forests. This species is usually sterile and is characterized by its conspicuously blue-green, granular thallus, which contains a bluish, N+ purple pigment. It is closely related to B. biatorina (Körb.) Vain., but differs from this species in a number of features apart from thallus pigmentation: the thallus granules are smaller, the amount of hyphal projections from the surface of the thallus granules is larger, and the internal pigmentation of the apothecia is different. Bacidia auerswaldii (Hepp ex Stizenb.) Mig. has a similarly granular thallus but differs from B. biatorina and B. caesiovirens in having wide, fusiform spores and smaller thallus granules. Bacidia absistens (Nyl.) Arnold has an internal apothecium pigmentation similar to B. caesiovirens, but differs in having a smooth thallus, and an abundance of minute crystals in the excipulum.

Type
Research Article
Information
The Lichenologist , Volume 27 , Issue 2 , March 1995 , pp. 91 - 98
Copyright
Copyright © British Lichen Society 1995

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