1897 ] A NEW QUILLWORT 
39 
that, sedcza, 2. e., formed from silica, would be a more appropriate 
term. | 
For the foregoing chemical investigations, as also for draw- 
ings and photographs, I am in a great measure indebted to Mr 
Karl Castelhun of this city 
NEWBURYPORT, Mass. 
EXPLANATION OF PLATES IV AND V 
PLATE Iv. 
Fic. 1. 4stival form of /soetes Eatoni. 
2. Leaf from same plant. 
3. A portion of one of the dichotomously branched roots. 
PLATE V. 
Fig. 1. Base of vernal leaf, which remains attached to the plant for a 
time after the upper portion, 1 a, has yed. Transverse sections of a ver- 
nal leaf, at points about four inches apart, are shown by the small figures at 
the right of I a. : 
Figs. 2 and 3. Macrospores. 
Fie. 4. Macropore from which the integument has been removed me the 
action of potassium hydroxide. _ 
Figs. 5-7. Microspores. © 
Fie. 8. Median section of an wstival leaf. 
