POLYPODIACEJE. . 83 



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 ciliate 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. Californicum 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 P. 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. 



III. PHLEBODIUM R. Br. 



Sori round, naked, dorsal, borne on the united ends of two 

 or more free veinlets which are included in the ample areolse 

 formed by the regularly anastomosing veins. Name from Gr. 

 0/le/Jj?, a vein. A small genus of tropical ferns mostly epi- 

 phytic. 



i. P. aureum (L.) R. Br. Rootstock stout, densely scaly ; 

 stipes i 2 long, castaneous, naked ; fronds 3 5 long, 9' 18' 

 broad, cut nearly to the rachis into broad entire or slightly 

 undulate pinnae ; areolae copious. Florida. 



IV. CAMPYLONEURON Presl. 



Sori round, naked, dorsal, borne in one or more rows either 

 side of the midrib. Primary veins distinct from midrib to 

 margin, connected by parallel transverse veinlets forming regu- 



