12 



POLYPODIACEAE 



6. Polystichum andersoni Hopkins. 

 Anderson's Shield-fern. Fig. 23. 



Polystichum andersoni Hopkins, Am. Fern Tourn. 3: 116. 

 pi. 9. 1913. 



Polystichum jenningsii Hopkins, Ann. Carnegie Mus. 11: 362. 

 pi. 37. 1917. 



Rhizome stout, decumbent; scales thin, pale cas- 

 taneous, large, linear to ovate, denticulate. Fronds 

 in a close crown, ascending, 40-110 cm. long; stipes 

 5-25 cm. long, sulcate, paleaceous ; blades nearly 

 2-pinnate, narrowly lance-oblong to lance-elliptic, 

 long-acuminate, 35-85 cm. long, 8-20 cm. broad at 

 the middle; rachis sulcate, paleaceous, proliferous 

 below the tip ; pinnae numerous, slightly ascending, 

 narrowly triangular, nearly pinnate at the base (the 

 basal segments enlarged), less deeply pinnatifid 

 toward the attenuate tip, minutely paleaceous be- 

 neath, glabrate above ; segments oblique, elliptical, 

 mostly adnate or semiadnate, decurrent, strongly 

 serrate, the teeth long-awned ; sori large, 2-6 pairs, 

 nearly medial; indusia erose-dentate, the teeth gland- 

 tipped. 



Moist rocky slopes, usually in alder thickets, Transition Zone; southern British Columbia to Glacier 

 National Park, Montana, and the region of Mount Rainier, Washington. Type locality: Elk River, Strath- 

 cona Park, Vancouver Island, British Columbia. 



7. Polystichum dudleyi Maxon. 

 Dudley's Shield-fern. Fig. 24. 



Polystichum dudleyi Maxon, Journ. Washington Acad. Sci. 8: 

 620. 1918. 



Rhizome decumbent, densely paleaceous; scales 

 brown to fulvous, thin, large, linear to ovate, denticu- 

 late-ciliolate. Fronds ascending, 40-120 cm. long; 

 stipes 15-45 cm. long, sulcate, chaffy ; blades 2-pin- 

 nate, oblong-lanceolate to narrowly ovate, long- 

 acuminate to attenuate, 25-75 cm. long, 8-25 cm. 

 broad; pinnae mostly oblique, contiguous, linear to 

 narrowly oblong-lanceolate from a broader unequal 

 base, attenuate, copiously filiform-paleaceous be- 

 neath, scantily so above; pinnules obliquely ovate or 

 ovate-oblong, auriculate, the upper basal ones large, 

 obliquely cleft or divided, the others serrate to in- 

 cised, the curved teeth short-awned; sori numerous, 

 terminal upon the veinlets or nearly so; indusia 

 delicate, long-ciliate. 



Rocky slopes of cafions, mainly in the Humid Transition 

 Zone; Santa Cruz Peninsula region, California. Type locality: 

 Santa Cruz Mountains, .San Mateo County, California. 





