1 10 OUR NATIVE FERNS AND THEIR ALLIES. 



7- P. reptans (Swz.) Eaton. Rootstock short, creeping; 

 stipes 3' 10' long, clustered, gray-stamineous, slender, naked ; 

 fronds 4' 12' long, membranous, softly hairy with branched or 

 stellate hairs, oblong-lanceolate, pinnate with nearly or quite 

 sessile, oblong, crenately pinnatifid pinnae, the apex pinnatifid, 

 often elongate and rooting; veins pinnate, simple, the basal 

 veinlets often anastomosing; sori on the middle of the veinlets, 

 rather small, sometimes with a minute rudimentary indusium. 

 (Polypodium reptans Swz., Aspidium reptans Mett.) On cal- 

 careous rocks, on left bank of Withlacoochee River, 15 miles 

 N.E. from Brooksville, Florida (/. Donnell Smith). 



XXIII. DRYOPTERIS Adans. SHIELD-FERN. , 



Sori round, borne on the back or rarely at the apex of the 

 veins. Indusium flat or flattish, cordato-reniform and attached 

 by the centre or sinus. Veins nearly always free. Stipe con- 

 tinuous with the rootstock. Name from Gr. Spv?, oak, and 

 Trrepz'S, a fern. (Aspidium Swz. in part.) A cosmopolitan 

 genus containing 150 species. 



* Fronds thin-membranous ; "veins simple or once forked. 



t Lowest pinna gradually reduced to mere lobes. 

 | Fronds in a crown from a stout, creeping rootstock. 



1. D. Montana (Vogl.) Ktze. Rootstock oblique, scaly; 

 stipes short, scaly below ; fronds \\ 2 long, broadly lanceo- 

 late, tapering below, glandular; pinnae 2' 3' long, deeply pin- 

 natifid, the lower slightly more distant; sori medium size, 

 nearly marginal ; indusia more or less toothed at the margin. 

 (Polypodium montanum Vogl., P. oreopteris Ehrh.) British 

 Columbia (Macoun), Unalaska (Turner). 



2. D. Nevadensis (Eat.) Unde. Rootstock creeping, 

 densely covered with the persistent bases of former stalks; 

 stipes short, scaly below ; fronds i 3 long, lanceolate, with 

 pinnae linear-lanceolate from a broad base, and crowded seg- 

 ments slightly hairy on the veins and with minute resinous 

 particles ; sori small, nearer the margin than the vein ; indusium 

 minute, furnished with a few dark-colored marginal glands and 

 with jointed hairs on the upper surface. California. 



