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- 1985
-
Mark
Saxicolous species of Caloplaca in southern Africa.
1985) In Proceedings of the Eleventh Plenary Meeting of the Association for the Taxonomic Study of the Flora of Tropical Africa. Missouri Botanical Garden, St. Louis. June 10-14, 1985.(
- Contribution to journal › Published meeting abstract
- 1981
-
Mark
Cetraria
(
- Chapter in Book/Report/Conference proceeding › Book chapter
- 1980
-
Mark
Lichens of western North America with disjunctions in Macaronesia and West Mediterranean region.
(
- Contribution to journal › Article
-
Mark
Everniastrum andense sp. nov., a neotropical paramo lichen.
(
- Contribution to journal › Article
-
Mark
Review of Krog, H., Østhagen, H. & Tønsberg, T. Lavflora, Norges busk- och bladlav.
(
- Contribution to journal › Scientific review
- 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