103 
1. Ce gracillima D.C. Eat. Lace Fern. Tufted xerophyte, the fronds 
q@ numerous, erect, densely crowded, wre® the et broken stipes of past 
Gersistont)osoas hon the matted rootcrown, the blades bipinnate, elongated, nerrowly 
oblong-lanceolate, 5-10 cm. long, lightly hairy above at first, becoming 
green and glabrous, permanently tomentose beneath with abundant brown scale-lik, 
hairs, the rachis chaffy with similar but longer scale-like hairs, the stipes 
puberulent and lightly glandular at bases indusium continuous around the 
segment, the sori confluent. 
Rare in our region, in rock crevices. Hughes Mdwe, Warren 3023 Revett 
Lake, 6000 fte, Epling et al. 10177. 
2e Ce siliquosa Maxon, Loosely tufted fern with chestnut-shining stipes fron 
Peco —Erosdempem a somewhat matted rootcrown, the fronds 
tripinnate, rather long-stalked, the blades more or less deltoid or ovate- 
deltoid, glabrous throughout, 3-5 cm, long, the pinnae with more or less 
qh) reflexed margins, their edges thinner, erosulate and partially covering the 
sporangia to form the indusium, the fertile fronds thus with thickened 
subterete ultimate segmentse (Onychium densum Braches C. densa St. John, not 
7 Fee 
Infrequent, on rock ledgese Upper Priest Re, 3000 ft., Epling 6562; 
Roman Nose Mt., Epling. 
5, Pteridium Glede ex Scop. Bracken, 
Coarse fern from strong subterranean creeping and repeatedly-—branched 
Ge rhizom@, bearing large subcoriaceous fronds alternately on the rhizome, the 
blades tripinnate, the 3 divisions bipinnate with narrow sublinear segments, 
the margins revolute; sori marginal, continuous; indusia of two kinds, the 
E> outer being}inrolled margin of the segments, the inner variable from a 
continuous membrane to a broken membrane or merely a few hairs, A single 
‘ 
worldwide species, of all temperate and tropical regionse 
