tapering evenly toward the pinnatifid apex, chartaceous; rachis sparsely to densely 

 pubescent, nearly always with a few persistent narrowly lanceolate light-brown 

 scales; pinnae numerous, linear-lanceolate, sessile, deeply pinnatifid three fifths 

 to usually more than four fifths of their width, 8-20 mm. wide, the veins and leaf 

 tissue glabrous above or sometimes with minute hairs about 0.1 mm. long on the 

 leaf tissue above, the costae above and below with longer hairs to 0.5 mm. long; 

 costae below usually with a few attenuate scales to 1 mm. long; pinnules linear- 

 oblong, often strongly oblique, subfalcate, the margin entire, rounded or usually 

 appearing acute because of the revolute margin, the basal segments of the medial 

 pinnae frequently narrower and slightly longer than more distal pinnules; veins 

 simple, 6-13 pairs per segment, the basal pair meeting the margin at or slightly 

 above the sinus; sori supramedial to submarginal, numerous, discrete; indusia 

 persistent, pubescent, often glandular; sporangial stalks eglandular. Dryopteris 

 normalis var. Lindheimeri C. Chr. 



On wet bluffs and ledges in canyons, especially at the base of dripping limestone 

 bluffs, about springs and along water courses, on the Edwards Plateau in cen. Tex. 

 s, to n. Ver. and Pue. 



7. Thelypteris nomialis (C. Chr.) Moxley. Fig. 18. 



Fronds erect, arching, mostly 5-15 dm. tall; rhizomes creeping, brownish, 

 4-8 mm. in diameter; stipes usually 3-6 mm. in diameter, arising from the 

 rhizome at 1-3 cm. intervals in a more or less bilinear series (infrequently the 

 stipes clustered), stramineous above, darkened at the base, about as long as the 

 blade, glabrous to moderately hairy, paleate at the base; rhizome scales castaneous, 

 shining, lanceolate, more or less pubescent; blades lanceolate (the lowest pair of 

 pinnae the longest or only slightly shorter than the next pair of pinnae), mostly 

 3-7 dm. long, 16-30 cm. wide, pinnate-pinnatifid, herbaceous to chartaceous, the 

 rachis pubescent and often stipitate-glandular, rarely with a few persistent scales; 

 pinnae numerous, sessile, linear-lanceolate, to 2 cm. wide, pinnatifid three fifths 

 to three fourths of their width, the costae, costules and sometimes the veins 

 above more or less pubescent with hairs mos'ly 0.2-0.5 mm. long, the tissue 

 between the veins above glabrous; pinnules numerous, linear-oblong, somewhat 

 oblique, rounded at the tip or appearing acute because of the revolute margins, 

 entire except for the basal pinnae segments of the lower pinnae which may be 

 slightly enlarged with a crenate margin (auricles present); veins simple (except 

 those of the auricles which may be once-forked), 6 to 11 pairs per segment, 

 connivent at the sinus or the distal one of each pair meeting the margin slightly 

 above the sinus; sori medial, numerous, usually discrete; indusia large, persistent, 

 moderately to densely hairy; sporangial stalks with minute stipitate glands. T. 

 Kunthii of auth., Dryopteris normalis C. Chr. 



On the edge of sandy creeks, in swamps, low wet woods and slopes in e. Tex.; 

 W. I. and Mex. to n. S.A. 



7. Dryopteris Adans. 



Rhizomes stout, erect or short-creeping; scales fibrous, glabrous, entire to 

 toothed, not ciliate; fronds and pinnae sometimes more or less dimorphic; blades 

 pinnate-pinnatifid to tripinnate; stipes stout, stramineous, shorter than the blades, 

 with 3 to 7 free bundles; ultimate segments mostly toothed, often subspinulose, 

 glabrous, not ciliate, occasionally capitate-glandular, sparingly to densely scaly, 

 the minor axes decurrent on the major ones to form the sides of the dorsal grooves; 

 veins free, simple or mostly forked, ending short of the margin in elongate hyda- 

 thodes; sori dorsal on the veins, inframedial to submarginal; indusium reniform, 

 large, persistent, glabrous, sometimes glandular on margin or back. 



A large world-wide genus of about 150 species that are found mainly in tropical 

 and subtropical regions of both hemispheres. 



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