166 
smaller spore and antheridium (in /ffexilzs the spore is .450 long), 
the membrane of which is granular (instead of smooth as in flexilts). 
Plate 186, fig. 1, nat. size, figs. 2, 3 and 4 X 25, fig. 5 X 50. 
NITELLA CALIFORNICA Sp. nov. 
Nitella monarthrodactyla, furcata, homceophylla, gymnocarpa, 
monoica, apiculata. : 
Plant of medium size, aspect of ordinary MV. flexilis ; leaves 
once divided, terminal divisions one-celled, abruptly pointed, ter- 
minals of sterile leaves elongated, of fertile leaves shorter, often 
_ incurved; sporophydia aggregated, usually 2 at a node, coronula 
evanescent; spore (nucleus) .500.to .535 long, .450 to .530 broad, 
with 6 or 7 prominent strie; membrane of spore granular. An- 
theridium .285 in diameter. 
This species has been collected in different places in California, 
in two forms : I, the ordinary, diffuse form; and 2, forma niaifica, 
closely resembling a species of Tolypfella, in the compactness of 
the fertile verticils. It differs clearly from WV. flexilis Ag., which 
it closely resembles and to which it is most nearly related by the 
size of the nucleus and particularly in the granular membrane of 
the spore. These markings on the spore differ also from those of 
N. Mexicana Allen, by being much coarser; the spores are also 
larger than Mexicana. te 
The ordinary form collected by Mr. J. W? Blankinship, 12 
Lake county. 
The forma midifica, collected by the same gentleman in Hum- 
boldt county, June 12, 1893. 
Plate 185, fig. 1, nat. size, fig. 2 < 25, fig. 3 X 50. 
NITELLA OCCIDENTALIS Sp. nov. 
Nitella monarthrodactyla, furcata, homceophylla, gymnocarp4, 
dioica, acuminata, sporophydia aggregata. 
Plants small, 8-10 cm. in height, delicate, .535 in diameter; 
leaves 6, .440 in diameter, once divided, terminals acuminate, 170 
in diameter at base ; sporophydia 2-3 at the fork of the leaves; Be: 
nucleus .390 long by .320 broad (variations .345, -360 and .399 
long by .320, .340 and .365 broad), with 6 ridges not prominent; oe 
membrane roughened with elevations, ridges and depressions. 
Antheridium about .800 in diameter. 
7 This plant differs from MV. montana Allen, in the smaller : 
nucleus, which is differently sculptured and the larger antheridia- 
