/ OF 
7, Adiantum (Tourn.) Le Maiden-hair. 
Comely ferns of el gon comnonly delicate submembranous frondg 
Cirith slender rootstocks) ex§ borne upon tough but very slender dark mahogany 
stipes, the fronds of ours dichotomous, the two divisions with 4-7 pinnately 
compound pinnae, the pinnules oblique, rhomboidal, more or less deeply lacerate 
on the distal margin, this margin inrolled in the fertile fronds to form 
the false marginal indusia, the proximal margin firm, entire, the pinnules 
rounded and erosulate at their tipse 
1. Ae pedatum var. aleuticum Rupre Graceful ferns of distinctive aspect, 
10-50 cme tall, arising from scaly running rootstocks, the blades pedate- 
semicircular, spreading, 12-35 cm. wide, the pinnae 10-25 cm. long, varying 
within a single colony and with the seasons, the pinnules lunate-oblong, now 
obtuse or rounded, now acute to a sharp tip, truncate at the base 12-22 mm, 
long; sori short lunate or outermost even horse-shoe-shaped with a nearly 
f 
closed sinuSe 
Occasional, sometimes very localized, in deep woods along streams at 
lower elevations. This fern is highly variable in (outline of its pinnules, (ch: 
being now broadly oblong end perfectly rhomboidal, now narrowly oblong and 
strongly arcuate, and either obtuse or distinctly triangular-acute. The 
last condition seems to obtain with early season or otherwise non-optimal 
times in the maturation of the fronds. This deserves more attention. 
8. Dryopteris Adans. 
Leafy large-fronded ferns, the blades bipinnate to tripinnate, the pinnae 
symmetrically reduced upwards, all the pinnules toothed, commonly with acute, 
spinulose or bluntish teeth, Sori roundish, covered by commonly cordate- 
reniform or horseshoe-shaped indusia, the indusia prevailingly firm, chartaceou 
and persistent, and attached by the center or sinuse (Aspidium Swz.; Thelypteri 
schnide) Saino PPOTE Sener OTe ee Oe e e 
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