LEJEUNEA HOLTIL, A NEW HEPATIC FROM KILLARNEY. 35 
apart. Every true Bryopteris, and every species of the subgenera 
Lopholejeunea and Acrolejeunea, has perfectly simple female branches; 
in the first-named subgenus so short that the flowers appear sessile ; 
in 
female branches are found also in a great many Prionolejeunee, 
Trachylejeunee, Leptolejeunea, Cheilolejeunea, &c. In some sub- 
genera it is the rule to have an “at invari short female branch, 
te er 
again at its apex. Of this structure | Seicolejowne and Platylejeunea 
are notable instances; and the same is to be seen also in certain 
Trachylejeunee, Leptolejeunea, ko.* _ So that the peculiarity which 
group, of which I = described three species under the name 
Potamolejeunea. These all grow in North Brazil,’ almost on the 
1 
pletely submerged for a short period at the ae of flood. L. 
(Potamolejeunea) polystachya nob. (Hep. Am. et And. 250) is a 
stouter plant than L. Holtii, 14-2 in. long, but has the same 
s 
times as long as the leaves, and consist of 5-10 pairs of bracts 
erie: the ea — ni Bee ack sim eee: never . 
leaves are about the same size as those of L. Hoitii, but the leaves 
are always a rounded at the apex, = the lobule is twice as 
large as in L. Holtii and nearly lane (not inflated). In t her 
cue and in their other characters acy recede still further from 
ant, especially in the form of the perianth, which is far more 
slip tly keeled, and in one species (L. temnantha nob.) is truncate.t 
* See the introduction to Lejeunea in “esi Am, et And.’ pp. 63—81, and 
the detailed characters of subgenera that follow 
working azonian Lejeunee I was in doubt whether to 
make of these few species a sub; part, oe oF to. regard them a mere n 
of Eulejewnea. The elongate stems, pinnulate with nearly sessil ers, 
is, their most salient difference from typical npn (L. serpy —_ e. —. and 
e subgenus is to be maintained, it will be advisable to add t 
Eulejeunea) L. inundata nob. (op. ct 278, t. 10), which 
” When, however, we attempt 
aes 8 saiasing lie he affinities are in most eases so 
ge 
into natural sections, although the 
