Taxonomic and geographic studies in North American ferns. I. The genus Athyrium and the North American ferns allied to A. Filix-femina. II. Botrychium virginianum and its American varieties | Zendy

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Taxonomic and geographic studies in North American ferns. I. The genus Athyrium and the North American ferns allied to A. Filix-femina. II. Botrychium virginianum and its American varieties

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