ALGOLOGICAL NOTES. 
93 
Prasiola stipitata Suhr — Figs. 11-16. 
Fig. 11. — Surface of male plant, a, lower part; b, higher; c, still higher; 
d, formed pollinoids discharging. X 200. 
„ 12 — Longitudinal section of male plant, a-d, correspond to the same 
lettering as in Fig. 11. X 400. 
„ 13. — Surface of female plant, a, near the lower part ; b, the cells 
changing into spores ; c, mature spores. X 200. 
„ 14. — Longitudinal section of female plant, a, cells in transverse rows 
of four ; b , mature spores scattered. X 400. 
„ 15. — Free pollinoids. X 800. 
„ 16. — Mature spore. X 800. 
BIBLIOGRAPHY. 
Quelques remarques sur le genre Myriotrichia. By Mile. Karsakoff 
(“ Journal de Botanique,” December, 1892). 
In this important paper Mile. Karsakoff has given a most in- 
teresting account of the reproduction and development of the two 
common species of the genus Myriotrichia. The reproductive organs 
of Myriotrichia are of two kinds, as in the majority of Pha?ophyceae 
— the plurilocular and unilocular sporangia. The latter have long 
been known, and are figured by Harvey in the “ Phycologia Brit- 
annica,” but it is only quite recently that the latter have been 
described. In a recent paper (“ Journal of Botany/’ November, 
1891) Mr. Buffham has given a description of the plurilocular 
sporangia of the two species from a morphological point of view, 
and this paper of Mile. Karsakoff may be regarded as in some 
respects complementary to his. 
In M. filiformis the plurilocular sporangia surround the upper 
part of the thallus with a thick cushion, and are small, ovoid, and 
sessile. The exterior cell-wall and the internal partitions are 
thin and transparent ; the zoospores contained in the interior are 
coloured, have two cilia, and a red spot like the zoospores of the 
majority of Phseophycese. The sporangia are sometimes very 
small, shortly oval, and divided into two chambers by a transverse 
partition, sometimes larger, elongated, or enlarged at the base, and 
have three or even four rows of chambers. The two former are 
frequently found side by side on the same filament. The small 
sporangia with two rows of chambers usually contain four rather 
large zoospores, the others six to a dozen, usually eight, smaller 
zoospores. These zoospores escape from the sporangia by either a 
terminal or lateral opening. 
In AT. clavceformis the plurilocular sporangia are usually conical, 
with three or four rows of chambers. Some of these sporangia 
contain eight zoospores (sometimes six or seven), which escape 
from the sporangia one after the other, either through a single 
terminal opening or through a terminal and a lateral opening ; 
