The Flora of the Cayuga Lake Basin 29 



d. Sori near the margin ; pinnules obscurely crenate-serrate ; basal scales bright 



brown. 6. T. marginalis 



d. Sori not near the margin. 



e. Fronds 18—40 cm. wide ; pinnae broadest in the middle ; pinnules obscurely 

 serrate, oblong-linear; basal scales with a dark center. 



7. T. Goldiana 

 e. Fronds 18 cm. wide or less ; pinnae broadest at the base ; pinnules coarsely 

 spinulose-serrate, short-oblong ; basal scales brown, without a dark center. 

 /. Fronds narrow ; pinnae 3-8 cm. long, the lowest, at least, ovate ; sori as 



near the margin as the midvein. 8. T. cristata 



f. Fronds broader ; pinnae 8 cm. long or more, oblong-lanceolate ; sori 

 often near the midvein. 8a. T. c, var. Clintoniana 



c. Fronds 3-pinnatifid or 3-pinnate ; ultimate segments spinulose-toothed and 

 incised. 

 d. Indusium glabrous ; segments of the pinnules subacute, somewhat falcate ; 

 scales of the stipe pale throughout ; fronds usually less finely divided than 

 in the variety ; pinnae usually more ascending. 9. T. spinulosa 

 d. Indusium glandular ; segments of the pinnules usually straight, and commonly 

 subtruncate ; scales of the stipe pale with a dark center ; fronds finely 

 dissected. 9a. T. s., var. intermedia 



1. T. Dryopteris (L.) Slosson. {Phcgopteris Dryopteris (L.) Fee.) Oak Fern. 

 Damp shaded woods in ravines and about swamps, in deep humus, rarely in dry 



upland woods ; frequent. June IS— July. 



S. of Caroline Depot; Michigan Hollow Swamp; n. and e. of Danby village; 

 Ellis Hollow; Beaver Brook; arbor vitae swamp e. of Clyde; and in many of the 

 ravines of the basin. 



Newf. and Lab. to Alaska, southw. to Va., Kans., Colo., and Oreg. ; rare or absent 

 on the Atlantic Coastal Plain. Found also in Greenland and Eurasia. 



2. T. hexagonoptera (Michx.) Weatherby. (Phegopteris hcxagonoptera (Michx.) 



Fee.) Beech Fern. 



Damp or rather dry, shady, stony or gravelly, sterile, subacid neutral to slightly 

 calcareous, soils, with much humus ; infrequent. June 25-Aug. 10. 



North Spencer, top of hill n. w. of station; n. of Slaterville Swamp; lower 

 entrance to Enfield Glen; Amphitheater, Six Mile Creek; Fall Creek woods 

 {D. in C. U. Herb.) ; Warren woodlot n. of Fall Creek, above Forest Home; s. side 

 of Shurger Glen ; border of swamp on hill w. of Genoa ; low pasture, Canoga. 



Cent. Me. to w. Que. and Minn., southw. to Fla., La., Iowa, and Okla. ; occasional 

 on the Coastal Plain. 



3. T. Phegopteris (L.) Slosson. {Phcgopteris polypodioides Fee.) Beech Fern. 

 Damp or dry shaded cliffs in ravines and in damp woodlands, in humus mostly on 



neutral shales and gravels ; scarce. June 25-July. 



Enfield Glen, in several places ; the narrows between Slaterville and Caroline 

 Center (K. M. W ., A. J. E., & L. F. Randolph) ; low woods. Fir Tree Swamp, 

 Freeville (A. J. E. & A. Gershoy). 



Newf. (Greenland) to Alaska, southw. to N. Y., Va., Wis., Iowa, and Wash.; 

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



4. T. palustris Schott. {Aspidium Thelypteris (L.) Sw.) Marsh Shield Fern. 



Boggy meadows, pond shores, and ditches, in acid or slightly calcareous soils ; 

 common. Aug. 25-Sept. 



About the bogs of Spencer, Danby, Caroline, Ithaca, Dryden, and McLean, and 

 those north of Cayuga Lake. 



Newf. to Man., southw. to Fla., La., and Tex., including the Coastal Plain. Found 

 also in Eurasia. 



