MESOGLOIACEAE 53 
regularly pinnate and the cells of the terminal and marginal 
filaments being commonly broader than long and often con- 
spicuously inflated or subdolioform. 
The narrower and less branched of the denuded forms found 
intermingled under Coker’s 108 make a close approach to Kiitz- 
ing’s figure of Desmarestia affinis, but the broader and more 
branched specimens under the same number are in general habit 
not far from the plant figured by Montagne, and we. suspect that 
Desmarestia peruviana Mont. and D. affinis Sond. represent dif- 
ferent forms and conditions of the same species. 
Family MESOGLOIACEAE 
MYRIOCLADIA J. Ag. Linnaea 15: 48. 1841 
Myriocladia grandis sp. nov. 
Thallus solid, flaccid, the main axes subterete and about 2 mm. 
in diameter just above the small basal disc, soon much flattened, 
7-15 mm. wide,* 2-5 mm. thick, bearing few or rather numerous, 
irregularly disposed subdistichous branches, these subterete or 
the larger slightly complanate, 2-22 cm. long, 2-7 mm. road, 
flexuous, simple or once or twice furcate or with a few short and 
irregular lateral ramuli, obtuse, slightly tapering or of nearly 
uniform diameter; peripheral assimilatory filaments mostly 0.5-І 
mm. long, always much shorter than the diameter of the axes, 
mostly flexuous, simple, consisting of direct continuations of 
primary filaments of axis and also of their secondary subdichoto- 
mous, subsecund, or occasionally opposite or 3-verticillate ramuli, 
axial filaments on reaching periphery mostly 3-5 times closely 
subdichotomous, the major 14-22 и broad, 50-60 cells long, their 
lower cells 2-4 times as broad as long, the upper commonly nearly 
isodiametric and submoniliform, terminal cells a little longer and 
soon deciduous; minor assimilatory filaments 8-11 и broad, 10-30 
cells long, their cells nearly isodiametric or often a little longer 
than broad; assimilatory filaments of an intermediate character 
intermingled with the “major” and the “minor”; colorless hairs 
apparently wanting; longitudinal filaments of the axis 11-32 и in 
diameter, commonly separated by about their own diameter, 
usually more crowded in the center, occasionally anastomos- 
ing, subdichotomous; sporangia obovoid or pyriform, often curved 
at the base, 66-75 и X 38-44 и, occasionally solitary but com- 
monly in groups of 3-8, secund, alternate, or sometimes ор- 
* These measurements were made before drying and pressing. 
