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Abstract
A new species of Crossidium (Pottiaceae, Bryophyta), C. karoo, is described for South Africa. It uniquely differs from congeners in tight encapsulation of the photosynthetic filaments by the clasping upper lamina.
We are grateful to P M Eckel for the illustration and the rendering of a diagnosis into Latin. We thank the curators of the herbaria mentioned for loan of specimens. The Missouri Botanical Garden is acknowledged for its continuing support of study of the South African flora. The University of Cape Town and The National Research Foundation of South Africa provided funding for the research.
Taxonomic Additions and Changes: Crossidium karoo R.H.Zander & Hedd., sp. nov.