By Engel John J.   Gradstein S. Rob   in Taxon

ISSN:1996-8175|52|4|763-773

International Association for Plant Taxonomy‎(2003)‎

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By Reiner-Drehwald M. Elena   Gradstein S. Rob   in Journal of Bryology

ISSN:1743-2820|19|3|638-640

Maney Publishing‎(1997)‎

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