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Notes on lichenicolous species of Opegrapha s. lat. (Arthoniales) on Arthoniaceae and Verrucariaceae, with a key to British and Irish lichenicolous Opegraphaceae

Published online by Cambridge University Press:  19 March 2021

Brian J. Coppins Open the ORCID record for Brian J. Coppins [Opens in a new window] ,
Sergey Y. Kondratyuk Open the ORCID record for Sergey Y. Kondratyuk [Opens in a new window] ,
Javier Etayo Open the ORCID record for Javier Etayo [Opens in a new window]  and
Paul F. Cannon Open the ORCID record for Paul F. Cannon [Opens in a new window]
Brian J. Coppins
Affiliation:
Royal Botanic Garden Edinburgh, 20A Inverleith Row, EdinburghEH3 5LR, UK
Sergey Y. Kondratyuk
Affiliation:
N.G. Kholodny Institute of Botany, Tereschenkivs'ka str. 2, 01004 Kiev-4, Ukraine
Javier Etayo
Affiliation:
Navarro Villoslada 16, 3° dcha, 31003Pamplona (Navarra), Spain
Paul F. Cannon*
Affiliation:
Department of Taxonomy and Biodiversity, Royal Botanic Gardens, Kew, SurreyTW9 3AB, UK
*
Author for correspondence: Paul Cannon. E-mail: p.cannon@kew.org
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Abstract

Three species of lichenicolous Opegrapha s. lat. are newly described, all apparently host-specific at genus level. Opegrapha arthoniicola Coppins & S. Y. Kondr. is described from western Britain and Ireland, where it grows on the thallus of Arthonia radiata on Corylus bark; it has small clustered ascomata, asci that are usually 6-spored and rather small ascospores (10.5–)12.5–14.5 μm in length. Opegrapha sawyeriana Coppins occurs on the thallus of Coniocarpon cinnabarinum, also on Corylus bark, from oceanic western parts of Scotland, Ireland and southern England; in comparison to O. arthoniicola it has smaller, often scattered ascomata with a pigmented basal layer, 8-spored asci and slightly larger ascospores 13–14.5(–16) μm in length. Opegrapha hochstetteri Coppins has been found on thalli of Verrucaria hochstetteri and V. muralis on calcareous rocks and stonework in southern England and Luxembourg; collections were formerly identified as Opegrapha rupestris Pers. but it differs from this species by narrower ascomata with a persistent narrow slit, normally 6- rather than 8-spored asci and ascospores with pigmentation in the spore wall rather than the perispore. Lifted from synonymy is Opegrapha opaca Nyl., which inhabits the thallus of Verrucaria nigrescens and V. viridula on calcareous rocks and stonework, and is so far recorded from southern England, Luxembourg, France, northern Spain and Israel. The hosts of the European species of lichenicolous Opegrapha on Verrucaria s. lat. on calcareous rocks (O. hochstetteri, O. opaca and O. rupestris) belong to different phylogenetic lineages within the Verrucariaceae. A key is also provided to the lichenicolous species of Opegraphaceae currently known from Great Britain and Ireland.

Keywords

ArthoniaBagliettoaConiocarponlichen parasitesVerrucaria
Type
Standard Papers
Information
The Lichenologist , Volume 53 , Issue 2 , March 2021 , pp. 159 - 169
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of the British Lichen Society

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