84 OUR NATIVE FERNS AND THEIR ALLIES. 



lar arches. Areolse similar, containing two or more sori. 

 Name from Gr. Ka/.ntv^oZ, curved, and vevpov,^ a nerve. A 

 tropical genus of about 50 species. 



i. C. phyllitidis (L.) Presl. Rootstock stout, scaly ; stipes 

 short or none; fronds simple, i 3 long, i' 4' broad, the 

 point acute, lower part gradually narrowed ; texture rigid, cori- 

 aceous ; areolae in rows of 6 12 from midrib to edge. Florida. 



V. PHYMATODES Presl. 



Sori round, naked, dorsal, various in position. Veins forming 

 fine, copious, irregular areolae with free veinlets spreading in 

 various directions. Name from Gr. <ftv^a, a swelling. A tropical 

 genus of about 60 species. 



i. P. Swartzil (Bak.) Underw. Rootstock wide creeping, 

 slender, covered with linear ferruginous scales; stipes ' i' 

 long, slender, naked; frond simple, 2' 4' long, ' f broad, 

 narrowed gradually toward both ends, the edge entire, undulate, 

 or slightly lobed ; sori uniserial on free veinlets. (P. serpens 

 Swz.) Key Largo, Florida (Curtiss). 



VI. GYMNOPTERIS Bernh. 



Sori oblong or linear, following the course of the veinlets 

 and, like them, simple, forked, pinnate, or variously branching, 

 without indusia. Name from Gr. yv^ro?, naked, and Trrepz'?, 

 fern. Includes about 25 species, mostly tropical. 



* Veins free, under surface not farinose. 



1. G. hispida (Mett.) Underw. Rootstock creeping ; stipes 

 grayish, puberulent, 3' 6' long; fronds 5-angled, i' 3' each 

 way, hispid above, tomentose beneath, pinnate ; lower pinnae 

 much the largest, unequally triangular, pinnate ; upper pinnae 

 lobed or crenate. (Gyinnograniine Ehrenbtrgiana of former 

 edition not of Klotzsch, G. podophylla Hook in part, G. hispida 

 Mett.) Texas to Arizona. 



* * Fronds farinose below. 



2. G. triangularis (Kaulf.) Underw. (GOLDEN-RACK.) 

 Stipes densely tufted, slender, blackish-brown, polished, 6' 

 12' long; fronds 2' 5' each way, deltoid, pinnate; lower pinnae 

 much the largest, triangular, bipinnatind ; upper pinnae more or 



