Il8 OUR NATIVE FERNS AND THEIR ALLIES. 



from the margin at an angle of 30° — 40° ; texture thin ; veins 

 free, i — 3-forked ; sori in two more or less clearly marked rows 

 with scattering sori between them and beyond the outer row. 

 {Aspidium juglandifoUum of former editions, not of Kunze.) 

 Texas to Arizona. 



XXVI. TECTARIA Cav- 



Sori round, borne on the back of the frond. Indusium 

 peltate, opening all around the margin. Veins everywhere 

 anastomosing, forming copious areolae, with free included vein- 

 lets. Name from Latin tettiim, a koof. , A small tropical genus. 



I. T. trifnlJTi^B (L*.) Cav. Stipes tufted, I or more long, 

 brownish, scaly at base; fronds 12' — 18' long, 6' — 12' broad, 

 with a large ovate-acuminate terminal pinna narrowed or forked 

 at the base, and one or two lateral ones on each side, the lowest 

 mostly forked ; primary veins distinct to the margin ; areolae 

 fine, copious, with free included veinlets ; sori in rows near the 

 main veins ; indusia orbicular, peltate. (Aspidium trifoUaium 

 Swz.) Florida, Western Texas. 



XXVII. NEPHROLEPIS Schott. 



Sori round, arising from the apex of the upper branch of a 

 vein, usually near the margin. Indusia reniform or roundish. 

 Veins all free, the fronds simply pinnate, the pinnae articulated 

 at the base, and bearing white cretaceous dots on the upper 

 surface. Name from Gr. re<ppo6i, a kidney, and Xeiti'i, a scale. 

 A tropical and sub-tropical genus containing seven species. 



1. N. exaltata (L.) Schott. Stipes 4' — 6' long, naked or 

 slightly scaly; fronds 1° — 6° long, 3'--6' broad; pinnx close, 

 lanceolate, the edge entire or slightly crenate, the upper side 

 auricled at the base, the lower rounded ; rachis nearly naked ; 

 sori sub-marginal; indusia firm, distinctly reniform. Florida; 

 frequent in cultivation. 



2. N. acuta (Swz.) Presl. Stipes 4' — 8' long, naked or 

 slightly scaly; fronds 2° — 4° long, 8' — 12' broad; pinnae 4' — 8' 

 long, i' — i' broad, acute, entire or slightly crenate, the upper 

 side auricled, the lower rounded at base ; rachis and both sides 

 nearly naked ; sori submarginal ; indusia suborbicular, subpel- 



