OT ANIGAGEAZETLT R: 
Vot. XII. CRAWFORDSVILLE, IND., JANUARY, 1887. No. 1. 
A Revision of the North American Species of Fissidens.*—I. 
CHARLES R. BARNES. 
After examining critically the North American species of 
Fissidentea, I conclude that the group as elaborated in the 
Manual of Mosses of North America, by rinwarerie and 
James, includes too many nominal species, and that it would 
be better to combine some forms which have been separ ated 
as poorly defined species. In this revision | attempt to make 
the distinctions between species more nearly equivalent to 
those which the best systematists demand between species of 
hanerogams. The descriptions of the Manual are neces- 
sarily condensed and are not clearly diagnostic. I therefore 
pr esent complete descriptions so far as material at hand per- 
mits, and embody the most obvious diagnostic characters in 
a synoptical key. I also offer some critical remarks upon 
difficult, doubtful or excluded spec 
For the synonymy of all species peearieg in Great Britain, 
I refer to Braithwaite’s British Moss-Flora, and supply only 
references to American wees er collections. In species 
not British full synonymy is 
In description [ have sabsttated leaf-cells for the unmean- 
ing term ‘‘areolation,” and rAzzozds tor ‘‘radicles.” I use 
the terms vaginant lamina, vertical lamina and inferior lamina 
to designate respectively the sheathing or conduplicate por- 
tion of the leaf, ya whole of the vertical blade, and the part 
of it below the co 
Whenever ners" I include in the descriptions meas- 
urements of the leaf-cells of the vertical lamina and of the 
spores, instead of the indefinite expressions ‘large’’ or 
‘*small.”” Measurements of height are in all cases exclu- 
sive ae the fruit. 
* Read before the A. A. A. S., Buffalo meeting, August, 1886. 
