Species Filicum, Vol. 4 Being Descriptions of the Known Ferns, Particularly of Such as Exist in the Author's Herbarium, or Are With Sufficient Accuracy Described in Works to Which He Has Access; Accompanied With Numerous Figures (Classic Reprint)

Excerpt from Species Filicum, Vol. 4: Being Descriptions of the Known Ferns, Particularly of Such as Exist in the Author's Herbarium, or Are With Sufficient Accuracy Described in Works to Which He Has Access; Accompanied With Numerous Figures

Sari as in Aspleniece (subord. VI. Vol. 11. P. Except that the involucres are arranged in pairs, Opposite to each other, one originating on the superior side Of a veinlet, the other On the inferior side Of the Opposite veinlet or branch. - A small group, with one exception, having undivided fronds. Venation free, or more or less anastomosing.

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