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Myriospora, a genus newly reported for Antarctica with a worldwide key to the species

Published online by Cambridge University Press:  26 January 2018

O. W. PURVIS ,
S. FERNÁNDEZ-BRIME ,
M. WESTBERG  and
M. WEDIN
O. W. PURVIS
Affiliation:
Camborne School of Mines, University of Exeter, Penryn, TR10 9EZ, UK. Email:owpurvis@gmail.com
S. FERNÁNDEZ-BRIME
Affiliation:
Department of Botany, Swedish Museum of Natural History, P. O. Box 50007, SE-104 05 Stockholm, Sweden
M. WESTBERG
Affiliation:
Museum of Evolution, Uppsala University, Norbyvägen 16, SE-752 36 Uppsala, Sweden
M. WEDIN
Affiliation:
Department of Botany, Swedish Museum of Natural History, P. O. Box 50007, SE-104 05 Stockholm, Sweden
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Abstract

Myriospora signyensis Purvis, Fdez-Brime, M. Westb. & Wedin is described from Signy Island, South Orkney Islands, Antarctica, where it occurs predominantly on quartz mica schist. This represents the first record of the genus for Antarctica. The distinctive interrupted photobiont arrangement places it within the genus Myriospora (formerly known as the ‘Acarospora’ smaragdula group, or Silobia). The new species is characterized by having large, distinctly elevated, sessile apothecia with a prominent margin and a thallus that is usually lobed at the margins and variously orange-red, rust-coloured or brown-pigmented. Molecular phylogenetic analyses inferred with strong support that M. signyensis is closely related to M. scabrida which is similar in having a lobed, imbricate thallus with large and frequently somewhat raised apothecia, but which differs in never being rusty red, by frequently having a larger number of apothecia per areole/squamule and by having a thick and distinctive thalline epinecral layer. Myriospora signyensis is otherwise most similar to M. dilatata but the thallus of M. dilatata is never imbricate-lobate and the ascomata of M. signyensis have larger and more distinctly raised and sessile apothecia. A worldwide key to the 10 species currently recognized in the genus is presented.

Keywords

Acarosporaceaelichenized fungusrefugiataxonomy
Type
Articles
Information
The Lichenologist , Volume 50 , Issue 1 , January 2018 , pp. 101 - 112
Copyright
© British Lichen Society, 2018 

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