1050 POLYPODIACEAE 



4. C. Eatoni Baker. Scales of the rhizome mostly with dark brown or black- 

 ish centers; fronds tufted, 6-38 cm. long; blades oblong-lanceolate, tripinnate; 

 pinnae ovate-oblong; stipes and primarj^ and secondary rachises chaffy, with 

 white or pale rusty, imbricate, sub-appressed, lanceolate to linear scales; tomen- 

 tum consisting of long slender ribbon-like hairs; ultimate segments about 1.5-2 

 cm. long, the terminal one often twice larger; indusium continuous around the 

 pinnule, slightly membranous at margin. Rocky places: Utah Ark. Ariz.; 

 Mex. 



15. NOTHOLAENA R. Br. 



Small ferns, with pinnately compound fronds lacking proper indusia and 

 almost always farinose, hairy, or chaffy on the under surface. Margins of the 

 blade sometimes inflexed at first over the sporangia. Sori roundish or oblong, 

 marginal, borne near the ends of the free veins. 



Blades tomentose, not farinose beneath. 1. N. Parryi. 

 Blades whitish-farinose beneath, not hairy. 



Rachises divaricate-flexuose. 2. N. Fendlcri. 



Rachises straight or nearly so, not divaricate-flexuose. 3. N. nivea. 



1. N. Parryi D. C. Eat. Scales of the rhizome dark reddish brown, mostly 

 with narrow blackish midribs; fronds tufted, 4-26 cm. long; stipe and rachises 

 dark reddish or purplish brown; blades oblong-lanceolate, tripinnate; ultimate 

 segments roundish obovate, 2 mm. broad, crenately incised, densely coated on 

 the upper surface with tangled, whitish or pale tomentum, and on the lower 

 surface with light brown tomentum; tomentum consisting of slender articulated 

 hairs. On rocks: Calif. Utah Ariz. Son. 



2. N. Fendleri Kunze. Scales of the rhizome bright reddish brown, one-col- 

 ored; fronds tufted, 7.5-23 cm. long; stipes and rachises dark brown; blades 

 broadly deltoid-ovate, 4-5 pinnate below, gradually simpler above; ultimate seg- 

 ments oval or elliptical, simple or 3-lobed. On rocks: Colo. "Tex." "Ariz." 

 Son. Mont. 



3. N. nivea Desv. Scales of the rhizome reddish brown, one-colored, fronds 

 tufted, 3-20 cm. long; stipes and rachises dark brown or black; blades ovate, 

 lanceolate, triangular-ovate or deltoid, 3-pinnate; pinnules long-stalked; ultimate 

 segments green and smooth on the upper surface, roundish, nearly as broad as 

 long, the terminal ones larger, entire or 3-lobed; sori often descending the veins. 

 On rocks: Utah N.M. Ariz.; Mex. and S. Am. Son. 



16. POLYPODIUM [Tourn.] L. POLYPODY. 



Ferns varying in size and habit. Fronds entire to pinnately compound. 

 Sori borne on the backs of the fronds, round to elliptical, non-indusiate, dorsal 

 or terminal on the free or anastomosing veins, the veins free in our species. 



1. P. hesperium Maxon. Rhizomes hard, liquorice-like, chaffy; stipes 

 stramineous; blades 7.6-20 cm. long, 2.5-4.4 cm. broad, linear-oblong, deeply 

 pinnatifid or below pinnate ; segments elliptical or somewhat spatulate, narrowest 

 just above the often dilated base, broadly rounded at apex, obscurely or evidently 

 crenate; under surface slightly glandular; veins 1-3 times forked; sori large, 

 medial, on the ends of the veinlets. B.C. S.D. N.M. Ariz. Wash. 



FAMILY 3. MARSILIACEAE. MARSILIA FAMILY. 



Perennial herbaceous plants rooting in mud, in ours with 2-4-f olio 1 ' ate 

 stalked leaves borne on a creeping rhizome. Sporocarps containing both 

 macrospores and microspores, borne on peduncles attached to the lower 

 parts of petioles or to the rhizome close to them. 



1. MARSILEA L. 



Marsh or aquatic plants commonly growing in shallow water, with their 

 leaves floating on its surface. Leaves 4-foliolate. Sporocarps crustaceous, ovoid 



