CRYPTOGAMIA, FILICES. 313 
Maiden-hair. Mow -hair. 
With the exception of Botrychium Virginicum, this is the 
most elegant fern in our neighbourhood. From one to two 
feet high. Stem dark, smooth, and shining. In rich shady 
woods ; very common. Possesses medicinal virtues ? Peren- 
nial. July. 
397. DICKSONIA. L’Herit. sert. angl. 30. 
Sari punctiform^ marginal^ subrotund^ dis- 
tinct. Indusium double^ alternate^ superfi- 
cial^ exterior gaping^ the other marginal 
gaping within, — JVntt. 
1. D. fronds bi-pinnate; pinnulse oblong-lanceo- pHosiuscuia. 
late, pinnatifid, upper margin of the segments 
incised-dentate ; rachis somewhat hairy.— Willd. 
D. pubescens, Schk. 
Polypodium pilosiusculum, Muhl. in litt. 
Hairy Bicksonia. Small-fruited Bicksonia. 
From twelve to fifteen inches high. In shady woods, and 
particularly on rocks ; common. Perennial. July. 
398. ISOETES. Gen. pL 1620. 
Capsule membranaceous, not gaping ; frond 
immersed at the base, 1 -locular. Seed an- 
gular, inserted into the numerous filiform 
receptacles . — JSTutt. 
1. 1, frond subulate, semi-terete. — Willd. lacastrij, 
Icon. Schk. filic. t. 173. FI. Dan. 191. Dill, 
mus. t. 80. f. 1. 
From one to two inches high. In a boggy wood south of 
Laundreth’s Gardens, and on the overflowed shores of the 
Delaware, above Kensington ; very abundant. Perennial. July. 
