A lectotype for Macromitrium cirrosum (Hedw.) Brid. (Orthotrichaceae)

Abstract

A lectotype for Anictangium cirrosum Hedw. [≡ Macromitrium cirrosum (Hedw.) Brid.] is designated herein from among the material on the single herbarium sheet bearing this name in the Hedwig-Schwägrichen herbarium (G). Lectotypification is necessary as the 11 specimens present on the sheet have different geographic and temporal origins, and represent two different taxa (M. cirrosum and M. scoparium Mitt). Hedwig’s A. cirrosum was based on the pre-1801 Hypnum cirrosum Sw., proposed by Swartz, and four specimens collected by Olof Swartz from Jamaica as well as material from Montserrat are included on Hedwig’s original herbarium sheet in G. With reference to Hedwig’s protologue and original illustrations, a lectotype was selected from among these specimens. Probable duplicates of the Swartz material were located in NY and S.

Keywords:

• Macromitrium cirrosum
• Lectotype
• Hedwig
• Mosses
• Orthotrichaceae

This work was supported by the Natural History Museum, London (BM) and the Conservatoire et Jardin botaniques de la Ville de Gèneve (G). We would like to thank Anders Tehler and Lars Hedenäs (S) and Barbara Thiers and Bill Buck (NY) for looking for Swartz material in their respective collections. We are grateful to Len Ellis and two anonymous reviewers for their critical comments on an earlier version of this manuscript.

Taxonomic Additions and Changes: Nil.