MICROLEJEUNEA CARDOTI 163 
cell; lobule often poorly developed ; cells of lobe plane or nearly 
so, thin-walled throughout or with very indistinct trigones, aver- 
aging 13 بر‎ in diameter, ocelli at base of lobe usually present 
in robust leaves, consisting of one to three enlarged cells, 25 ¢ 
in diameter: underleaves distant, ovate, 0.07 mm. long, 0.05 
mm. wide, narrowed toward base and neither rounded nor decur- 
rent, bifid beyond middle with narrow, lanceolate divisions and 
acute sinus, the divisions about two cells broad at base and end- 
ing in a row of two to four cells: inflorescence dioicous: 9 in- 
florescence borne on a leading branch, innovating on one side, the 
innovation mostly simple and sterile; bracts complicate, some- 
what unequally bifid, the lobe obliquely spreading, oblong to ob- 
ovate, 0.35 mm. long, 0.15 mm. wide, rounded to very obtuse at 
apex, margin entire, lobule ovate, obtuse to subacute, 0.3 mm. lon 
0.1 mm. wide, keel wingless or with a very narrow and indistinct 
interrupted wing ; bracteole free, ovate, 0.25 mm. long, 0.12 mm. 
wide, bifid about one third with subacute lobes and sinus ; perianth 
somewhat exserted, pyriform from a narrowed base, inflated, 0.5 
mm. long, 0.35 mm. wide, rounded at apex and with a short beak, 
obtusely five-keeled: 4 spike occupying a short branch, some- 
times proliferating and giving off short branches beyond inflo- 
rescence ; bracts in about two pairs, inflated, subequally bilobed 
with obtuse divisions: bracteole at base of spike similar to under- 
leaves: spores greenish, with a thickened minutely verruculose 
wall, averaging 23 in short diameter, varying in length. 
On bark of willow. Pointe a la Hache, Louisiana (Langlois), 
the type-locality ; also reported from Mexico. 
The specimens of M. Cardoti at the writer's disposal are so 
poorly developed that it is impossible to gain from them a clear 
idea of the species. On this account, no figures are given. The 
plants from Louisiana, collected by Langlois, are presumably the 
type specimens, as they are the ones first quoted by Stephani. 
They are perfectly sterile and all their lobules are apparently 
rudimentary. They seem to lack also the basal ocelli which are 
ascribed to the species. In the plants from Mexico (Hep. Amer. 
136), a few of the stems bear perianths and some of the lobes show 
ocelli, but even here a well developed lobule is rare. The original 
description was probably drawn from the Mexican specimens. 
Stephani compares M. Cardoti with M. ulicina, M. bullata and 
M. lucens ; it is also related to M. Ruthit. It can be distinguished 
from M. ulicina by its relatively smaller lobule, by its slightly 
smaller leaf-cells, and by the rounded lobes and entire margins of 
