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Beiträge zur Pilzflora von Südamerika. XII. Sphaeriales

Published in Hedwigia, in 1901, in volume 40, pages 100-124

Zur Morphologie und Systematik von Parmelia, Untergattung Hypogymnia

Published in Hedwigia, in 1901, in volume 40, pages 171-274

Fungi Indiae orientalis. II

Published in Hedwigia, in 1901, in volume 40, pages 323-342