1909] Lambert,— Two new Species of Characium 78 
crustacean, and quickly develop into the adult Dactylococcus, the 
protoplast of which finally becomes divided into three or more daughter 
cells. The subsequent history of these daughter cells was not ob- 
served. Whether these features which have been described for 
Dactylococcus De Baryanus offer any solution for the gaps which at 
present I am unable to bridge in the life history of Characium gracilipes 
and Characium cylindricum, cannot be told until further observations 
'an be made on living material of the two species of Characium and, 
if possible, on Dactylococcus De Baryanus itself. 
Characium gracilipes and Characium cylindricum are hosts of а 
fungus, two stages of which are figured. Fig. 3 (pl. 79) shows an 
early stage; a late stage is represented in fig. 2 (pl. 79). The fungi 
occur attached to any part of either species, except the rhizoids and 
the distal region of the terminal hair in Characium gracilipes, and the 
region of attachment in Characium cylindricum. Presence of the 
fungus usually produces considerable modification in the shape of 
the Characium. In the earlier stages of the development of the fungus, 
the protoplast of the host shows a slight disturbance which increases 
as the development of the fungus advances. Ву the time the fungus 
has reached maturity, the protoplast of the host has usually quite 
disappeared, fig. 2 (pl. 79). This fungus will be the subject of a later 
paper. 
'Turrs COLLEGE, MASSACHUSETTS. 
EXPLANATION OF PLATE 79. 
All figures X 600. 
Fig. l. | Characium cylindricum, cell containing 8 spores; e, spore escaping 
from lateral aperture; n, nucleus of spore; p, hyaline papilla at 
anterior end of spore. 
Fig. 2. Characium cylindricum, empty cell with mature fungus sporangium 
(s) attached near distal end. 
Fig. 3. | Characium gracilipes, unicellular stage, with fungus cell (f) at-' 
tached on side opposite the pyrenoid. 
Fig. 4. Characium gracilipes, unicellular stage, a typical specimen; ру, 
pyrenoid on convex side of cell; r, rhizoids. 
Fig. 5. Characium gracilipes, 8 cells, distal and basal cells divided trans- 
versely; middle cells divided longitudinally. 
Fig. 6. Слагасіит gracilipes, 16 cells dividing to 32 cells by transverse 
- division; all pyrenoids on convex side of cells; а typical con- 
dition. 
Fig. 7. | Characium cylindricum, cell containing 32 spores which are ap- 
parently motile. 
