USGS

Primitive Plants

PWRC

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Characeae (algae) Adiantaceae (maidenhair ferns) Asplenianeae (spleenworts) Blechnaceae (deer-ferns) Dennstaedtiaceae (brackens) Dryopteridaceae (ferns) Equisetaceae (horsetails) Isoetaceae (quillworts) Lycopodiaceae (clubmosses) Lygodiaceae (climbing ferns) Ophioglossaceae (adder's tongues) Osmundaceae (royal ferns) Polypodiaceae (ferns) Selaginellaceae (spikemosses) Thelypteridaceae (ferns)

ALGAE

CHARACEAE
Nitella flexilis 1937
Nitella furcata 1969
Nitella microcorpa 1939
Nitella micronata 1937
Chara zeylanica 1970

VASCULAR PLANTS

EQUISETACEAE
Common Horsetail Equisetum arvense 1944,1946
LYCOPODIACEAE
Shining clubmoss Huperzia lucidula 1944
Bog clubmoss Lycopodiella inundata 1954
Running-pine Lycopodium clavatum 1936,1957
Southern ground-cedar Lycopodium digitatum 1937
Tree clubmoss Lycopodium obscurum 1937
Wiry ground-cedar Lycopodium tristachyum 1940,1943
SELAGINELLACEAE
Meadow Spikemoss Selaginella apoda 1937
ISOETACEAE
Quillwort Isoetes engelmannii 1937,1941
OPHIOGLOSSACEAE
Grape fern Botrychium dissectum 1938
Rattlesnake fern Botrychium virginianum 1937
Northern adder's-tongue fern Ophioglossum pusillum 1947
OSMUNDACEAE
Cinnamon fern Osmunda cinnamomea 1937
Interrupted fern Osmunda claytoniana 1943
Royal fern Osmunda regalis 1937
POLYPODIACEAE
Polypody Polypodium virginianum 1940
DENNSTAEDTIACEAE
Hay-scented fern Dennstaedtia punctilobula 1937
Bracken Pteridium aquilinum (prob. var. latiusculum) 1937
ADIANTACEAE
Maidenhair fern Adiantum pedatum 1969
ASPLENIACEAE
Ebony spleenwort Asplenium platyneuron 1937
THELYPTERIDACEAE
Southern Beech fern Phegopteris hexagonoptera 1937
New York fern Thelypteris noveboracensis 1937,1960
Marsh fern Thelypteris palustris 1937
Massachusetts fern Thelypteris simulata 1945
DRYOPTERIDACEAE
Silvery spleenwort Deparia acrostichoides 1942
Lady Fern Athyrium filix-femina 1944,1960
Toothed wood fern Dryopteris carthusiana
Crested fern Dryopteris cristata 1936
Marginal wood fern Dryopteris marginalis 1938
Christmas fern Polystichum acrostichoides 1937
Sensitive fern Onoclea sensibilis 1937
BLECHNACEAE
Net-vein chain fern Woodwardia areolata 1937,1945,1954
Virginia chain fern Woodwardia virginica 1937
LYGODIACEAE
American climbing fern Lygodium palmatum 

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