Acknowledgements
This work was supported by the Natural History Museum, London (BM). The contributions by H. Bednarek-Ochyra were financed through the statutory fund of the W. Szafer Institute of Botany of the Polish Academy of Sciences. She also thanks the curators at AAS, B, MO and WELT for arranging the loan of specimens. The field work of M. Lebouvier on Îles Crozet was organised within the programme 136 ECOBIO of the French Polar Institute (IPEV). F. Prosser thanks Michele Aleffi (Camerino) for confirming the identity of Cephaloziella elachista. Vincent Hugonnot thanks Sam Bosanquet for comments on his note. S. Ştefănuţ acknowledges support by project no. RO1567-IBB03/2017 through the Institute of Biology Bucharest of Romanian Academy. The contribution of Roger Andriamiarisoa, Des Callaghan and Catherine Reeb was made under LAbex BCDIV RICCIA, supported by French state funds managed by ANR within the Investissements d’Avenir Program (reference ANR-11-IDEX-0004-02), with fieldwork authorised by The Malagasy General Directorate of Forests and Tananarivo University Department of Plant Biology (79/16/MEEMF/SG/DGF/DAPT/SCBT.re). The contributions of O. M. Afonina and E. A. Ignatova were supported by RFBR Grant # 16-04-01156.
Taxonomic Additions and Changes: Nil.