Bulletin of miscellaneous information - Royal Botanic Gardens, Kew. (H.M. Stationery Office, 1923)

Forhandlinger i Videnskabs-selskabet i Christiania - Norske videnskaps-akademi i Oslo. ([Trykt hos Brøgger & Christie, 1911)

Hedwigia (Verlag und Druck von C. Heinrich, 1899)

Index bryologicus sive, Enumeratio muscorum hucusque cognitorum adjunctis synonymia distributioneque geographica locupletissimus - Paris, É. G. (Édouard Gabriel) 1827 -1911 (P. Klincksieck, 1894)

Transactions of the Royal Society of South Africa - Royal Society of South Africa. (Royal Society of South Africa, 1919)