92 OUR NATIVE FERNS AND THEIR AI/.IES. 



§ I. Adiantopsis Fee. Indusia distinct, roundish, confined 

 to the apex of a single veinlet. 



I. C. Californica (Nutt.) Mett. Rootstock short, creeping, 

 chaffy; stipes densely tufted, dark-brown, glossy, 4'— 8' long; 

 fronds 4' or less each way, broadly deltoid-ovate, smooth on 

 both surfaces, quadripinnatifid ; lower pinna; largest, triangular; 

 upper ones gradually smaller and simpler; ultimate segments 

 lanceolate, acute, incised or serrate ; indusia membranous. 

 {Aspidotis Californica Nutt., Hypolepis Californica Hook.) Ca- 

 lifornia. 



2. C. Pringrlei Dav. Rootstock slender, creeping, clothed 

 with linear- lanceolate scales; stipes i^' — 4^ long, reddish or 

 chestnut brown, scaly at base and sparingly above; fronds i' — 

 1^ long, nearly as broad, triangular or ovate-deltoid, bi— tripin- 

 nately divided into 5—7 pairs of pinnae, opposite and spreading 

 in the smaller sterile fronds, alternate and erecto-patent in the 

 larger fertile fronds, naked, dark-green; pinnae ^ — i^' long, the 

 lower unequally deltoid or ovate, bipinnate, the uppermost ob- 

 long, pinnate or deeply pinnatifid; pinnules ovate or oblong, 

 pinnately divided or cleft into obliq le segments, which are again 

 deeply cleft into cuneate, strap-shaped divisions, those of the 

 largest segments again deeply cut into narrow, obtuse, cuneate 

 lobes, the recurved tips in fertile fronds forming distinct her- 

 baceous involucres with entire or slightly crenulate margins; 

 sori one to each ultimate lobe on the apex of a free veinlet. 

 South-eastern Arizona {Pringle). 



§ 2. EuCHEILANTHES. Indusia more or less C07iflue7it, tisu- 

 ally extending over the apices of several veinlets, but not contiftu- 

 ous all round the segments ; segments jnostly fiat, not bead-like. 



* Segments of the frond smooth. 



t Pinttce few, not more than 5 — 6 pairs. 



3. C. Wrig-htii Hook. Stipes castaneous, slightly chafTy 

 at base, i' — 2' long; fronds 2' — 3' long, ovate-oblong, tripinnat- 

 ifid, segments more or less incised ; indusium sub-continuous 

 or interrupted, similar to frond in texture. Western Texas to 

 Arizona. 



ft Pinnai nunierous. 



4. C. microphylla Swz. Rootstock short, creeping; 



