Class XXIV. Order I. 389 



iicute than in the European variety. Segments of the frond ob- 

 long, parallel, rounded at the end, very slightly serrate, furnish- 

 ed on the back with a double row of large, round, yellowish, 

 granular, naked dots of fructification. Perrenial. 



POLYPODIUM CONNECTILE. MX. Connected Polypody. 



Fronds twice pinnate, ciliate, the divisions opposite, 

 contiguous, adnate ; segments subelliptical ; stipe chaf- 

 fy, sori minute. 



A middle sized fern, having its divisions connected at base, so 

 as to form a continuous frond. Fructification in minute dots on 

 the back. Woods, Hallowell, Maine. 



POLYPODIUM DRYOPTEKIS. L. Ternate Polypody' 



Frond ternate, twice pinnate ; branches deflexed ; 

 segments obtuse, subcrenate ; root filiform. 



A tender and beautiful fern found in mountain woods. Stipe 

 slender, smooth, less than a foot long. The frond divides into 

 three branches, which are spreading and somewhat reflexed. 

 Each of these is pinnate, the divisions pinnate or pinnatind, with 

 the larger segments crenate. Fructification in very small, dis- 

 tinct dots. Near Hanover, New-Hampshire. 



447. WOODSIA. 



WOOD si A ILVENSIS. Pursh? Hairy Woodsia. 



Fronds pinnate ; divisions pinnatifid ; segments ob- 

 tuse ; fructification near the margin, at length conflu- 

 ent ; stipe villous. 



Syn. POLTPODIUM ILVEXSE. Willd. 



This little plant is the Polypodium ilvense of Muhlenberg's 

 catalogue, but seems somewhat different from the plant of Brown 

 and Pursh. Stipe from three to six inches high, chaffy below, 

 villous and woolly above. Frond pinnate, woolly underneath, the 

 margin covered with fructification. Barren rocks and dry wood.-. 



448. ASPIDIUM. 



ASPIDIUM ACROSTICHOIDES. Muhl. Terminal Shield Fern. 



Stipe chaffy ; frond long, pinnate, its divisions alter- 



