166. . BRITISH FERNS, 
will bear full exposure to the South, it attains greater 
luxuriance in a northern aspect, or when protected by 
artificial means from the rays of the sun. 
44. BRISTLE FERN. Tricuomanes sprctosum. 
Trichomanes speciosum, Willdenow. B. F’. 288, 288, 
93. 
2, 
Trichomanes radicans, Hooker, but not of Swartz. 
The rootlets and creeping caudex of the Bristle 
Fern a good deal resemble those of the Common 
Polypody, but on a smaller scale: the rootlets are 
black and clothed with fibrille, which, like the 
claspers of ivy, adhere to the surface of rock: .the 
herent: this I found to be a character of the plant 
when most luxuriant, but I discovered other smaller 
plants possessing more rootlets and less caudex, and: 
having the rootlets fixed in a thin layer of moist 
earth, among a profusion of moss and Filmy Fern. 
The young frond exhibits itself ina very rudimentary 
state in the autumn, and at any part of the caudex 
except its growing extremity ; its full development is: 
see 
