76 
4 3ae Indusia horseshoe~shaped, the sinus nearly Closed, 
2 of firm texture 
@ b Le: f-segments without spinulose teeth 
8. Dryopteris filix-mas 
6 Le: f-segments with spinulose teeth 
~ Fronds bipinnate; stipes with a few pale chaff-like 
is scales 
“ 
8 Dryopteris Spinulosa 
Fronds tripinnate 3 Stipes with several light 
ié& brown chaff-like scales 
Condy 4 Sbe Indusia bladder-like or membr 
8. Dryopteris dilatata 
anous} inflated and sac-like, 
fronds rather membranous (see 3c) 9, Cystopteris 
4 attached by one side; 
fragilis 
- et 
4 3c. Indusia peltate or stellate, attached by a central stalk 
¢ to the center of the Sorus © 
& Pinnae with a distinct ae at the base, simply pinnate 
= Pinnae about 4 times &@as long as broad 
» with prominent marginal 5 
i prickle-tipped teeth 10. Polystichum lonchitis 
q 5 Pinnae 8-12 times as long as broad, with short bristle-tipped 
'f, teeth 
10. Polystichum munitum 
» more or less bipinnatifid 
© Fronds €renulate-glandular 
; Pinnae not auricled 
lle Woodsia scopulina 
@ Fronds nearly or quite glabrous 
lle Woodsia oregana 
