by Carl Christensen
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Les Fougères d'Indochine
The Pteridophyta of the arctic regions
A revision of the Pteridophyta of Samoa
A new Dryopteris from Cuba
On some ferns from the Malay Peninsula
The American ferns of the group of Dryop...
A revision of the fern genus Dryopteris ...
K morfologii spor
An analysis of the mating system of the ...
The American species of Dryopteris, subg...
Chemotaxonomic investigations on Finnish...