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- 1987
-
Mark
Cetraria (Parmeliaceae) and some related genera on the African continent.
(
- Contribution to journal › Article
-
Mark
Morphological characteristics and affinities of the genus Cornicularia.
(
- Chapter in Book/Report/Conference proceeding › Book chapter
-
Mark
Evolutionary trends and phylogentic analysis in the Teloschistaceae.
(
- Contribution to conference › Abstract
- 1986
-
Mark
Protein banding pattern in the Ramalina siliquosa group.
(
- Contribution to journal › Article
-
Mark
The genera Bryocaulon, Coelocaulon and Cornicularia and formerly associated taxa.
(
- Contribution to journal › Article
-
Mark
Morphology of the genus Coelocaulon Link and formerly associated taxa.
1986)(
- Chapter in Book/Report/Conference proceeding › Paper in conference proceeding
-
Mark
The marine diatom genus rhizosolenia : A new approach to the taxonomy
1986)(
- Thesis › Doctoral thesis (monograph)
- 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
- 1982
-
Mark
Relationship between plant weight and density in mixed populations of Medicago sativa and Trifolium pratense.
(
- Contribution to journal › Article
- 1981
-
Mark
Cetraria
(
- Chapter in Book/Report/Conference proceeding › Book chapter