Review of the type specimens of species described by J. Hedwig in Phascum Hedw. (Pottiaceae).

Abstract

Johannes Hedwig, in his early publication Species muscorum frondosorum, included 12 species under the genus Phascum Hedw. Phascum curvicolle Hedw. has been effectively lectotypified and P. cohaerens Hedw. was found to have a satisfactory holotype. The previously published typifications of P. alternifolium Hedw., P. muticum Hedw., P. piliferum Hedw. and P. subulatum Hedw. are clarified or corrected herein. Of the remaining species, over 200 years after their valid publication, P. crispum Hedw., P. cuspidatum Hedw., P. nitidum Hedw., P. patens Hedw., P. serratum Hedw. and P. stoloniferum Hedw. are typified for the first time. As a consequence of lectotypification, Ephermerum minutissimum Lindb. is placed in synonymy with E. serratum, and Ephemerum stoloniferum (Hedw.) L.T.Ellis & M.J.Price comb. nov. is proposed. Associated with the typification of P. cuspidatum, the lectotype of Phascum schreberianum Dicks. is designated more precisely herein.

Keywords:

• Moss
• Hedwig
• Phascum
• lectotype
• Pottiaceae

Acknowledgements

This work was supported by The Natural History Museum, London (BM) and Conservatoire et Jardin botaniques de la Ville de Genève (G). The authors are grateful to Dr Silvia Pressel (BM) for producing the photomicrographic images of Ephemerum stoloniferum and E. serratum. We would also like to thank Eva Maier and two anonymous reviewers for their critical comments on an earlier version of this article.

Taxonomic Additions and Changes: Ephemerum stoloniferum (Hedw.) L.T.Ellis & M.J.Price, comb. nov.