FILICES. 83 



4. P. pectinatum L. Stipes rigid 2' 6' long; fronds el- 

 liptical-lanceolate, i 2^ long, 2' 6' broad, cut to the rachis 

 into horizontal, entire or toothed pinnae, the lower ones much 

 reduced ; rachis naked or finely villose ; veinlets pellucid, once 

 or twice forked ; sori in long rows, of medium size. Florida. 



2. GONIOPHLEBIUM Blume. Veins forming ample regular 

 areolce (almost imperceptible in No. 5), each with a single distinct 

 free included veinlet, bearing a sorus at its terminus. 



* Under surface squamous. 



5. P. incanum Swz. Rootstock woody, wide creeping, cov- 

 ered with small brown scales; stipes i' 4' long, erect, densely 

 scaly; fronds 2' 6' long, i' iV broad, cut to the rachis into 

 entire pinnae; texture coriaceous ; sori small; veins indistinct, 

 united or frequently free. Virginia to Illinois, and southward. 



6. P. thysanolepis A. Br. Rootstock slender, firm, densely 

 covered with minute lanceolate scales ; stipes 3' 12' long, erect, 

 scaly ; fronds ovate, 3' 9' long, 2' 3' broad ; pinnae distant, as- 

 cending, blunt, dilated at base (except the lowest), thick, sub- 

 coriaceous, covered below with cil'iate scales with brown centre 

 and broad scarious border ; areolae and sori in a single series. 

 Huachuca Mountains, Arizona (Lemmon), Mexico. 



** Under surface mostly smooth. 



7. P. Calif ornicum Kaulf. Rootstock creeping, chaffy; 

 stipes 2' 6' long, stramineous when dry, naked ; fronds ovate 

 to oblong-lanceolate, 4' 9' long, i' 5' broad, cut nearly or quite 

 to midrib into finely-toothed pinnae; texture papyraceo-herba- 

 ceous ; sori large; veinlets 4 6 to each vein. (Including/*, in- 

 termedium H. & A.) California. 



*- 8. P. Scouleri H. & G. Rootstock stout, creeping, scaly; 

 stipes 2' 4' long, erect, naked ; fronds thick, 3' 12' long, 2' 6' 

 broad, cut down to rachis into from 5 29 close, blunt pinnae; 

 texture coriaceous, fleshy when recent; sori very large ; veinlets 

 regularly anastomosing forming a single series of large areolae. 

 (P. carnosum Kellogg, P. pachyphyllum D. C. Eaton.) Cali- 

 fornia and northward. 



?' 3. PHLEBODIUM R. Br. Veins forming ample areolce, each 

 with two or more distinct, free, included veinlets bearing sori on 

 their united points. 



