Holly Fern. _Polystichum Lonchitis_
Marsh Fern. _Aspidium Thelypteris_
Marsh Fern, in the mass
Massachusetts Fern. _Aspidium simulatum_
New York Fern. _Aspidium noveboracense_
Sori of _Aspidium noveboracense_
Pinnae and Sori of _Aspidium noveboracense_
Oak Fern. _Phegopteris Dryopteris_
Northern Oak Fern. _Phegopteris Robertiana_
Broad Beech Fern. _Aspidium hexagonoptera_
Long Beech Fern. _Aspidium polypedioides_
Fragrant Fern. _Aspidium fragrans_
Marginal Shield Fern. _Aspidium marginale_
Crown of Fronds of _Aspidium marginale_
Sori of _Aspidium marginale_
Male Fern. _Aspidium Filix-mas_
_Aspidium Filix-mas_ and details
Goldie's Shield Fern. _Aspidium Goldianum_
_Aspidium Goldianum_, in the mass
Crested Shield Fern. _Aspidium cristatum_
Crested Shield Fern. _Aspidium cristatum_ (No. 2)
Clinton's Shield Fern. _Aspidium cristatum_ var. _Clintonianum_
Crested Marginal Fern. _Aspidium cristatum x marginale_
_Aspidium cristatum x marginale_, in the mass
Boott's Shield Fern. _Aspidium Boottii_
Spinulose Shield Fern. _Aspidium spinulosum_
_Aspidium spinulosum_ var. _intermedium_
_Aspidium spinulosum_ var. _americanum_
Bulblet Bladder Fern. _Cystopteris bulbifera_
_Cystopteris bulbifera_ with sprouting bulb
Fragile Bladder Fern. _Cystopteris fragilis_
Rusty Woodsia. _Woodsia ilvensis_
Northern Woodsia. _Woodsia alpina_
Details of Alpine Woodsia
Blunt-lobed Woodsia. _Woodsia obtusa_
Smooth Woodsia. _Woodsia glabella_
Hayscented Fern. _Dennstaedtia punctilobula_
Forked variety of _Dennstaedtia punctilobula_
Field View of _Dennstaedtia punctilobula_
Pinnae and Sori of _Dennstaedtia punctilobula_
Meadow View of Sensitive Fern
Obtusilobata Forms of Sensitive Fern, Leaf to Fruit
Sori of Sensitive Fern
Sensitive Fern. _Onoclea sensibilis_
Sensitive Fern, Fertile and Sterile Fronds on Same Plant
Ostrich Fern. _Onoclea Struthiopteris_. Fertile Fronds
Ostrich Fern. Sterile Fronds
Sori and Sporangia of Ostrich Fern
Royal Fern. _Osmunda regalis spectabilis_
Sori of Royal Fern
Interrupted Fern. _Osmunda Claytoniana_
Interrupted Fern. Fertile Pinnules Spread Open
Cinnamon Fern. _Osmunda cinnamomea_
Cinnamon Fern. Leaf Gradations
Two Varieties of Cinnamon Fern
_Osmunda cinnamomea glandulosa_
Curly Grass. _Schizaea pusilla_
Sporangia of Curly Grass
Climbing Fern. _Lygodium palmatum_
Adder's Tongue. _Ophioglossum vulgatum_
Moonwort. _Botrychium Lunaria_
Moonwort, Details
Little Grape Fern. _Botrychium simplex_
Lance-l