32 Karl M. Wiegand and Arthur J. Eames 



3. A. angustum (Willd.) Presl. (A spleniutn Filix-foemina of authors.) Lauy Fern. 



Low woods and fields, bogs, and swales, in mucky or gravelly neutral or acid soils ; 

 common. July-Sept. 



Newf. to N. Dak., southw. to Pa., 111., and Mo., including the northern Coastal 

 Plain. 



The fronds are very variable, but the variations are apparently ecological. The 

 typical form and the var. elatius (Link) Butters seem to be sun forms, whereas a 

 broader and less dimorphic shade form is var. rubcllum (Gilb.) Butters. (See 

 Rhodora 19: 169. 1917.) 



9. Camptosorus Link 

 1. C. rhizophyllus (L.) Link. Walking Leaf Fern. 



Shaded ledges on calcareous cliffs in ravines ; frequent. July-Sept. 



Enfield Glen; ravine n. of Lick Brook; Buttermilk Glen; Old Buttermilk Ravine; 

 Six Mile Creek (D. in C. U. Herb.!) ; Cascadilla Glen; Fall Creek, at Beebe Lake 

 and suspension bridge ; ledges at s. w. corner of Cayuga Lake and small ravines near 

 by ; Taughannock Gorge ; Shurger Glen ; Paine Creek ; probably in other ravines. 

 A small quantity in each place. 



Cent. Me. to Ottawa and Minn., southw. to Ga. and Kans. ; rare or absent on the 

 Coastal Plain. 



10. Asplenium L. 



a. Fronds 8-22 cm. long ; pinnae small, 3-8 mm. long, orbicular or short-oblong, not 

 auricled. 1. A. Trichomanes 



a. Fronds 20-50 cm. long ; pinnae oblong-linear, larger, 10-35 mm. long, auricled on 

 one or both sides. 2. A. platymnron 



1. A. Trichomanes L. Maidenhair Spleenwort. 



Dry or damp shaded ledges, on calcareous rocks in ravines ; common. June-Oct. 



Common in nearly all the ravines of the basin, and occasionally found along the 

 lake cliffs. 



Nearly throughout N. A. except in the extreme North and in Mex. ; rare or 

 absent on the Atlantic Coastal Plain. Found also in Eurasia. 



2. A. platyneuron (L.) Oakes. (A. ebeneum Ait.) Ebony Spleenwort. 



Dry rocky and sandy open woods, in calcareous or subacid soils ; infrequent. 

 June 25-Aug. 



Enfield Glen; Coy Glen; terrace, n. slope of South Hill; cemetery, University 

 Ave., Ithaca; Fall Creek (D. in C. U. Herb.) ; e. shore of Cayuga Lake, near Esty 

 Glen ; woods near Mud Creek Swamp ; and probably elsewhere. 



S. Me. to Ont. and Colo., southw. to the Gulf States and Tex., including the 

 Coastal Plain. 



11. Woodwardia Sin. 



1. W. virginica (L.) Sm. Chain Ferx. 



Moor of acid peat bogs, mostly in sandy regions ; rare. Aug.-Sept. 



Woodwardia Bog (D. in C. U. Herb.!) ; moor of peat bogs, Junius; n. e. end of 

 Duck Lake. 



N. S. to Fla., La., and Ark., chiefly along the coast ; also inland in the Great 

 Lakes region. 



Sterile specimens of this species resemble those of Osmunda, Thelypteris, and 

 Athyrium, from which they may be distinguished by the fronds being scattered and 

 by the presence of areolae in thd venation along the midrib. The numerous bundles 

 in the lower part of the stipe also serve to distinguish this genus from Osmunda. 



