[Vor. 5 
212 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
distinct particulars from the species hitherto described, 
namely, the original one of Bornet and Flahault, G. polyrhiza 
(Lager.) B. & Е. G. codiolifera (Chodat) Wille,? С. arrhiza 
Hariot? С. Holdenii Collins,t and С. Aegagropilae Acton.” 
Chodat casually mentions another species, (7. Manziana,? but 
there is no description and no diseussion which would enable 
one to judge the character of this plant. Miss Acton states 
that there is no valid reason for separating Foreliella from 
Gomontia, and Foreliella perforans Chodat should be known 
as Gomontia perforans (Chodat) Acton, so perhaps this 
species should likewise be added to the list. 
VEGETATIVE CONDITION 
The filaments of G. lignicola, neither in their general ap- 
pearance nor in their habit of growth, closely resemble the 
various species of the genus hitherto described. Except in 
young plants developing directly from zoospores (pl. 13, fig. 4) 
the individual cells are almost constantly cylindrical in form, 
from three to ten times longer than wide. Branching is so 
infrequent as to lead one to suppose the filament to be typi- 
eally simple, although occasionally lateral branches of a few 
cells only may occur. The beginning of such a branch is 
shown in pl. 14, fig. 4. No indication of the rosette arrange- 
ment of branched filaments described for G. polyrhiza was ob- 
served, and the habit of growth precludes any such formation. 
A most striking appearance is produced in the filament by 
the rather common condition of having the most of the chlo- 
rophyll concentrated in the terminal cell. A filament of a dozen 
or more cells, all approximately of the same size and shape, 
will, with the exception of the terminal cell, be so devoid of 
color as to give the appearance of a fungous hypha. Closer 
examination under a high-power objective reveals a thin 
thread-like chloroplast which runs for the length of the cell, 
* Bornet, E., et Flahault, C. H. Soe. Bot. Fr. Bul. 36: CLII. 1889. 
?Chodat, К. Bul. de l'Herb. Boissier 6 : 443. 1898 
з Нагіоб, P. Soc. Bot. Fr. Bul. 38 : 417. 1891. 
* Collins, Е. S. Erythea 5 : 95. 1897. 
* Acton, E. New Phytol. 15 : 102. 1916. 
*Chodat, R. Algues vertes de la Suisse 1: 61. 1902. 
