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Two new species of Arthoniaceae from old-growth European forests, Arthonia thoriana and Inoderma sorediatum, and a new genus for Schismatomma niveum

Published online by Cambridge University Press:  19 March 2018

Damien ERTZ
Affiliation:
Research Department, Botanic Garden Meise, Nieuwelaan 38, B-1860 Meise, Belgium; also Fédération Wallonie-Bruxelles, Direction Générale de l’Enseignement non obligatoire et de laRecherche scientifique, Rue A. Lavallée 1, B-1080 Bruxelles, Belgium. Email: damien.ertz@jardinbotaniquemeise.be
Neil SANDERSON
Affiliation:
3 Green Close, Woodlands, Southampton, SO40 7HU, UK
Anna ŁUBEK
Affiliation:
Institute of Biology, Jan Kochanowski University in Kielce, Świętokrzyska 15A, PL-25-406 Kielce, Poland
Martin KUKWA
Affiliation:
Department of Plant Taxonomy and Nature Conservation, Faculty of Biology, University of Gdańsk, Wita Stwosza 59, PL-80-308 Gdańsk, Poland

Abstract

Two new species of Arthoniaceae are described from old-growth European forests: Arthonia thoriana from Horner Combe in Great Britain and Inoderma sorediatum from the Białowieża Forest in Poland. Phylogenetic analyses using mtSSU sequences were used to determine the generic affiliation of the two species. Arthonia thoriana is characterized by a non-lichenized white thallus, pallid brown, white pruinose ascomata of 0·12–0·30 mm diam., richly anastomosing paraphysoids and (1–2–)3-septate ascospores of 9–12×3·0–3·5 µm. Inoderma sorediatum differs from all other species of the genus by a sorediate thallus and the production of confluentic acid. It is the sister species to I. afromontanum in our phylogenetic analyses. The discovery of the new species supports the high value of these forests for biodiversity action plans. Phylogenetic analyses also place Schismatomma niveum in the Arthoniaceae and the new genus Snippocia is described to accommodate it. The genus Leprantha is resurrected for its type species (L. cinereopruinosa). A lectotype is designated for Arthonia pruinosella.

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Articles
Copyright
© British Lichen Society, 2018 

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Two new species of Arthoniaceae from old-growth European forests, Arthonia thoriana and Inoderma sorediatum, and a new genus for Schismatomma niveum
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