P. A. Amerson

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16 collections found. 16 collections shown.

P. A. Amerson (696)

Azollaceae Azolla caroliniana Willd. - United States of America

P. A. Amerson (1112)

Blechnaceae Woodwardia areolata (L.) Moore - United States of America

P. A. Amerson (1726)

Blechnaceae Woodwardia virginica (L.) J. Smith - United States of America

P. A. Amerson (1850)

Dryopteridaceae Polystichum acrostichoides (Michx.) Schott - United States of America

P. A. Amerson (1843)

Dryopteridaceae Woodsia obtusa - United States of America

P. A. Amerson (2378)

Dryopteridaceae Woodsia obtusa - United States of America

P. A. Amerson (1266)

Lycopodiaceae Lycopodium adpressum (Chapm.) Lloyd & Underwood - United States of America

P. A. Amerson (544)

Lycopodiaceae Lycopodium carolinianum L. - United States of America

P. A. Amerson (844)

Ophioglossaceae Botrychium biternatum (Sav.) Underw. - United States of America

P. A. Amerson (1173)

Ophioglossaceae Botrychium virginianum (L.) Sw. - United States of America

P. A. Amerson (2379)

Ophioglossaceae Ophioglossum crotalophoroides Walt. - United States of America

P. A. Amerson (272)

Osmundaceae Osmunda regalis var. spectabilis (Willd.) Gray - United States of America

P. A. Amerson (2073)

Ceratopteridaceae Ceratopteris thalictroides (L.) Brongn. - United States of America

P. A. Amerson (2087)

Ceratopteridaceae Ceratopteris thalictroides (L.) Brongn. - United States of America

P. A. Amerson (3)

Pteridaceae Cheilanthes horridula Maxon - United States of America

P. A. Amerson (1111)

Thelypteridaceae Thelypteris palustris var. pubescens (Lawson) Fernald - United States of America