Il6 OUR NATIVE FERNS AND THEIR ALLIES. 



3. P. munitum (Kaulf.) Underw. Rootstock stout; stipes 

 growing in a crown, densely chaffy at base, more or less naked 

 above, the rachises with smaller scattered scales ; leaf 10' — 1 5' 

 long, 2' — 3' wide, with close, sharply serrated horizontal pinnae, 

 which are sharp-pointed and slightly falcate, strongly auricled 

 on the upper side at base, the serrations bristle-pointed ; sori in 

 a single row rather near the margin. Idaho to British Colum- 

 bia and California. 



Var. inciso-serratum D. C. Eaton.. Fronds taller, up to 

 6° long, with chaffy stipes ; pinnse 3' — 5' long, attenuate, the 

 margins sharply serrate. California and Oregon. 



Var. imbricans D. C. Eaton. Stipes naked, stramineous; 

 fronds narrow, the pinnse i' long, oblique, imbricated, the ser- 

 ratures ending in short points. Northern California to Wash- 

 ington. 



* * Pinnce partly pinnatifid below. 



4. P. scopulinum (D. C. Eaton) Maxon. Rootstock shoit; 

 stipes 2' — 6' long, cespitose, densely scaly at base (scales pale), 

 with small scattered scales on the rachis ; fronds 6' — 10' long, 

 li' — 2' wide, pinnate, the pinnse with usually one pair of pin- 

 nules at the base ; the margin serrate with incurved teeth, the 

 apex blunt-rounded ; sori in a single row either side of the 

 midrib and nearer the rib than the margin ; indusia large, 

 somewhat lobed. California and Oregon. 



5. P. Callfornicum (D. C. Eaton) Underw. Stipes 4' — 6' 

 long, clustered, densely chaffy at base, at length nearly naked 

 above ; rachises more or less clothed with narrow scales ; fronds 

 10' — 12' long, 2|' — 3' wide, pinnate; lower pinnse again pinnate 

 in the lower half, the lowest upper pinnule of each pinna en- 

 larged, the upper half of the pinna pinnatifid, incised, or serrate 

 with a spinose margin ; upper pinnze incised at base and 

 serrate at the tips ; sori i — 3 on each pinnule or lobe, commonly 

 two on the same side of the vein. California. 



* * * Fronds bipinnatifid or nearly bipinnate. 



6. P. Lemmoni sp. nov. Rootstock short, ascending; 

 stipes densely clustered, densely chaffy at base, with pale cinna- 

 mon-brown scales, 2' — 6' long, with more or less scattered scales 

 above; fronds 7'— 10' long, i^' — 3' wide, bipinnatifid or nearly 



