GILBERT VAN INGEN. 145 
Aspidium thelypteris, Swz.—Marshes—swampy woods : 
very common. 
Aspidium Noveboracense, Swz.—-Moist woods and 
swamps: common. | 
Aspidium spinulosum, Swz.—Frequent in rich woods. 
Aspidium spinulosum, var intermedium, Haton.—Com- 
mon in damp woods. 
Aspidium cristatum, Swz.—Common in swampy woods. 
Aspidium cristatum, var Clintonianum, Haton.—Fre- 
quent in swamps. 
Aspidium marginale, Swz.—Common in dry stony soil. 
Aspidium acrostichoides, Swz.—Common in dry woods. 
Aspidium acrostichoides, var incisum, Gray.—Fre- 
quent. 
Cystopteris bulbifera, Bernh.—In alluvial soil along 
Streams : common. 
Cystopteris fragilis, Bernh.—Shaded rocks : common. 
Woodsia obtusa, Torrey.—Common on cliffs along the 
Hudson River. 
Woodsia tlvensis, Rk. Br.—Common on exposed cliffs. 
Occasionally found in damp shady places with nearly 
glabrous leaves. 
Dicksonia pilosiuscula, Willd.—Along streams : common. 
Osmunda regalis, Z.—Swamps: common. 
An inconstant form is occasionally found in which the 
upper portion of the fertile part of the leaf is sterile. 
Osmunda Claytoniana, L.—Wetlow ground: common. 
Osmunda cinnamomea, L.—Wet low ground : common. 
Variety frondosa, Gray, is occasionally found. 
Onoclea struthiopteris, Hoffm.—Common in the alluvial 
soil along Wappingers Creek, where it fruits abund- 
antly. 
Onoclea sensibilis, I.—Fields: common. 
Variety obtusilobata, Torr. is frequent. 
Ophioglossum vulgatum, L.—Peat bogs: rare. 
Discovered September, 1888, in a peat bog near a small 
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