140 
mouth and base of lid bordered with smaller denser cells; neck 
with a few large stomata; peristome bright-red, spreading when 
dry, strongly incurved whe en moist; teeth about 1204 long, 
divided 2/3 their length, spiral at apex, trabeculate and slightly 
ciliate on the inner surface with projecting dorsal joints at base; 
spores green, smooth, 13-21 uw, maturing in summer. 
Habitat and type locality: At base of cypress trees, Caloosa, 
Florida (John Donnell Smith and C. F. Austin, 1878, without 
capsules). 
Distribution: Rediscovered at Sanford, Florida, by S. Rapp, 
1918; also Mexico (C. G. Pringle 15,167, 1908, as F. crenato- 
serrulatus Card.) and Minas Geraes, Brazil (Watnio, 1885, 
sterile, ex. herb. Brotherus, as F. tenerrimus C. Muell.). 
Dr. Charles R. Barnes,* in his Revision of the North American 
species of Fissidens, said of F. Donnellit: ‘‘This plant has been 
collected but once, without capsules, and ought probably to be 
referred to F. subcrenatus of Schimper, a Mexican species, from 
which its known characters differ only by the less number (by 
one pair) and greater narrowness of the leaves. The larger cells 
and the distinct serration of the leaves are obvious distinctions 
from F. Garberi, to which it is closely allied.” 
I cannot agree with these statements: because F. subcrenatius 
Schimp., collected in Mexico by Liebmann in 1843, belongs in the 
section Aloma, where Brotherus has placed it, with the leaf 
margins almost entire and the cells smooth, not mamillose; nor 
is it closely allied to F. Garberi, since that belongs in the section 
Semilimbidium, with the basal part of the duplicate blades of 
the perichactial leaves bordered and having its leaf cells only 
5-8 » in diameter, each with 2-4 small papillae, and the marginal 
cells either truncate or serrulate. Fissidens Donnellii belongs 
in the section Crenularia with sharply toothed leaves, and may 
possibly be related to, but is not identical with, F. prionodes 
Mont. (1835), if Brotherus is right in referring that species to 
this section. The drawings in the Annalesf seem to indicate a 
leaf with very large papillae, but original specimens from Mon- 
tagne in Mitten’s collection belong to the section Aloma, with 
* Bot. Gaz. 12:30. 1887. 
f Mont. Ann. Sci. Nat. Hl. 3: 200. pl. 3, f. 2. 1835. 
