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- 1979
-
Mark
The brown fruticose species of Cetraria.
(
- Contribution to journal › Article
- 1977
-
Mark
Masonhalea, a new lichen genus in the Parmeliaceae.
(
- Contribution to journal › Article
-
Mark
Three new species of brown fruticose Cetraria.
(
- Contribution to journal › Article