Karl (Carl) von Keissler - German botanist & lichenologist (1872-1965) (Keissl.)
Published author of:
- Phacopsis geographici (J.Steiner) Keissl., 1930
- Cyphelium trachylioides (Nyl. ex Branth & Rostr.) Erichsen ex Keissler, 1938
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