180 BOTANICAL GAZETTE [MARCH 
The oocyst normally gives rise to but one egg. The nucleus of the 
oocyst accordingly becomes the nucleus of the egg. | 
The oocysts were found containing eight eggs each. These must 
be considered a rare reversion to the Fucus type. 
The entire oocyst of Sargassum, unlike other genera of the Fuca- 
ceae which have been studied, is discharged with its enclosed egg. 
The oocyst wall may break, partially freeing the egg, or it may persist 
even enveloping a many-celled sporeling. 
Segmentation of the egg takes place while it is attached to the sur- 
face of the plant by the mucilaginous wall which surrounds it. This 
segmentation results first in a many-celled undifferentiated ellipsoidal 
sporeling. Rhizoids develop late at one end of the multicellular spore- 
ling, with no apparent relation to gravity or other stimulus. 
Asters, containing granular inclusions suggesting centrosomes, 
appear at the poles of the spindles in the early mitoses of the segmenta- 
tion of the egg. 
THE UNIVERSITY OF CHICAGO. 
LITERATURE CITED. 
Barton, E. S., ’91, A systematic and structural account of the genus Turbinaria 
Lamx. ‘Piers: Linn. Soc. Bot. 3: 215-226. pls. 54-55. 
BEHRENS, J., ’86, Beitrag zur Kenntniss der eg ia Rarer bei Fucus 
tices: lige Deutsch. Bot. Gesells. 4:92-10 
Bower, F. O., ’80, On the development of the sciceplecks in the Fucaceae. 
Quart. Jour. Micr. Sci. 20: 36-49. pl. 5. 
Crato, E., ’92, Die Physode, ein Organ des Zellenliebes. Ber. Deutsch. Bot. 
Gesells. 10:295-302. pl. 18. 
Davis, B. M., :04, The relationships of sexual organs in plants. Bot. GAZETTE 
GruBer, E., 96, idee Aufbau und Entwickelung einiger Fucaceen. Bibli- 
otheca Bot. 38:3 
HANSEN, A., ’95, Usher Stoffbildung bei den Meeresalgen. Mittheil. Zool. Sta. 
Neapel rz: 255-305. pl. 12. 
HANSTEEN, B., ’92, Studien zur Anatomie und Physiologie der Fucoideen. 
Jahrb. Wiss. Bot. 24: 317-360. pls. 7-10. 
,:00, Ueber das Fucosan als erstes scheinbares Product der Kohlensaure- 
assimilation bei den Fucoideen. Jahrb. Wiss. Bot. 35:611-625 pl. 14. 
Hotz, F. L., :03, Observations on Pelvetia. Minn. Bot. Studies 3:23-45- 
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