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Polythelis, an Overlooked Genus of Tropical Pyrenulaceae with Eu- and Distoseptate Ascospores

Published online by Cambridge University Press:  28 March 2007

D. L. Hawksworth
D. L. Hawksworth
Affiliation:
Commonwealth Agricultural Bureaux, Farnham Royal, Slough SL2 3BN.
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Abstract

The genus Polythelis Clem, has been almost entirely ignored since its description in 1909. It belongs to the Pyrenulaceae and is close to Pyrenula Massal. from which it is distinguished in having a true septum (euseptum) near the base of the ascospores as well as locules (distosepta) identical to those of Pyrenula. The genus includes a single doubtfully lichenized species, Polythelis sexlocularis (Müll. Arg.) Clem. (syn. Microthelia sexlocularis Müll. Arg.), known only from the type material collected on the bark of a species of Croton, probably C. linearis Jacq., in the West Indies or southern Florida prior to 1824.

Type
Research Article
Information
The Lichenologist , Volume 15 , Issue 2 , June 1983 , pp. 151 - 156
Copyright
Copyright © British Lichen Society 1983

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