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A new species of Thelocarpon from Dutch quarries, with a worldwide key to the species of the genus

Published online by Cambridge University Press:  13 November 2023

Henk-Jan van der Kolk*
Affiliation:
Bereklauw 93, Bennekom, 6721 RH, The Netherlands Dutch Bryological and Lichenological Society (BLWG), Utrecht, The Netherlands
Harold Timans
Affiliation:
Dutch Bryological and Lichenological Society (BLWG), Utrecht, The Netherlands
Jannes Boers
Affiliation:
Dutch Bryological and Lichenological Society (BLWG), Utrecht, The Netherlands
Laurens B. Sparrius
Affiliation:
Dutch Bryological and Lichenological Society (BLWG), Utrecht, The Netherlands
*
Corresponding author: Henk-Jan van der Kolk; Email: henk-jan@blwg.nl

Abstract

Thelocarpon periphysatum sp. nov. is described from marl quarries in the Netherlands. The species is characterized by perithecioid ascomata that have a green-yellowish ring around the ostiole, abundant periphyses and periphysoids that are up to 120 μm long, the absence of paraphyses and the wide, oblong and often somewhat asymmetrical ascospores. The perithecia are immersed in black cyanobacterial crusts on calcareous rocks. A worldwide key is provided to the 30 species of Thelocarpon that are currently accepted.

Type
Standard Paper
Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press on behalf of the British Lichen Society

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