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Platygrapha permutans Nyl. is an earlier name for Byssoloma rubrireagens Kalb & Vězda

Published online by Cambridge University Press:  24 June 2013

Robert LÜCKING
Robert LÜCKING*
Affiliation:
Department of Botany, The Field Museum, 1400 South Lake Shore Drive, Chicago, Illinois 60605-2496, USA. Email: rlucking@fieldmuseum.org
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Abstract

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Type
Short Communications
Information
The Lichenologist , Volume 45 , Issue 4 , July 2013 , pp. 579 - 580
Copyright
Copyright © British Lichen Society 2013 

In the course of revision of a number of type specimens of names described in the genus Platygrapha Nyl. (Nylander Reference Nylander1855), it was discovered that the type of P. permutans Nyl. (Nylander Reference Nylander1863) represents a species of Byssoloma. Closer morphological, anatomical, and chemical study revealed that it is conspecific with Byssoloma rubrireagens Kalb & Vězda (Reference Kalb and Vězda1990) and represents an earlier epithet for that taxon. The following combination is necessary:

Byssoloma permutans (Nyl.) Lücking comb. nov.

MycoBank No.: MB 802898

Platygrapha permutans Nyl., Acta Soc. Sci. Fenn. 7: 477 (1863); type: Colombia [Nova Granata], Cune, 1200 m, Lindig s. n. (H-NYL 4760—lectotype!; here selected; H-NYL 4764—isolectotype!).

Byssoloma rubrireagens Kalb & Vězda, Nova Hedwigia 51: 449 (1990); type: Costa Rica, Kalb & Plöbst s. n. (hb. Kalb 20613—holotype!).

(Fig. 1)

Fig. 1. Platygrapha permutans (H); A, lectotype with enlarged view of apothecia (inset); B, isolectotype with apothecia in enlarged view (inset). Scale=1 mm.

Notes. The types of Platygrapha permutans and Byssoloma rubrireagens agree in all important features: the whitish, verrucose thallus, the apothecia with black disc and whitish, byssoid but rather compact margin, the 3-septate ascospores 10–18×4–5 µm (erroneously annotated as 25–30 µm long and 7-septate on an annotation sheet on the lectotype), and the presence of norstictic acid. Byssoloma rubrireagens was originally reported from Costa Rica and Brazil (Kalb & Vězda Reference Kalb and Vězda1990) growing on bark and wood, so the type of Platygrapha permutans being from Colombia and growing on bark fits the apparently neotropical distribution of this species. It has not been found foliicolous in contrast to the widespread and common Byssoloma subdiscordans (Nyl.) P. James (Lücking Reference Lücking2008).

This study was made possible by two grants provided by the United States National Science Foundation (NSF) to The Field Museum: “Neotropical Epiphytic Microlichens” (DEB 0715660; PI Lücking) and “ATM – Assembling a taxonomic monograph: the lichen family Graphidaceae” (DEB 1025861; PI Lumbsch, Co-PI Lücking). Teuvo Ahti and Soili Stenroos are thanked for their assistance in examining the type material of Platygrapha permutans.

References

Kalb, K. & Vězda, A. (1990) Die Flechtengattung Byssoloma in der Neotropis (eine taxonomisch-phytogeographische Studie). Nova Hedwigia 51: 435–451.Google Scholar
Lücking, R. (2008) Foliicolous lichenized fungi. Flora Neotropica Monograph 103: 1–866.Google Scholar
Nylander, W. (1855) Essai d'une nouvelle classification des lichens (Second mémoire). Mémoires de la Société des Sciences Naturelles et Mathématiques de Cherbourg 3: 161–202.Google Scholar
Nylander, W. (1863) Lichenographiae Novo-Granatensis Prodromus (reprint titled: Prodromus Florae Novo-Granatensis auctoribus J. Triana et J.E. Planchon. Lichenes). Acta Societatis Scienciarum Fennicae 7: 415–504.Google Scholar
Figure 0

Fig. 1. Platygrapha permutans (H); A, lectotype with enlarged view of apothecia (inset); B, isolectotype with apothecia in enlarged view (inset). Scale=1 mm.