I40 FERNS OF KENTUCKY. 
the mother-cells of the spores being produced from the 
inner tissue. 
How the Botrychium differs in its development and 
mode of growth from other forms of the Vas¢ular Crypto- 
.gams must be left to the systematic works cited above. 
The excellent monograph, by Mr. Geo. E. Davenport, of 
Boston, has done much to simplify the subject, bringing to 
the notice of American readers the splendid researches of 
Milde, and, at the same time, supplementing them with his 
own careful investigations. Through his kindness I have 
been enabled to append to this work an etching from his 
Plate on the vernation in the Botrychia, drawn originally 
by Mr. Emerton (Plate LX). 
The name Moonwort is derived from the crescent or 
moon: shaped leaflets of the fronds of B. Lunaria, Swartz, 
a species but rarely found in the United States. 
Plate LV, figure 1, represents a fertile spike; figure 2, 
sporangium; figure 3, spore; figure 4, pinnz of sterile frond 
of B. Virginianum; the last from nature, the rest from 
Hooker and Bauer. 
