ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 185 



Cystoseira.*— C. Sauvageau pnblislies a moiiograpb of the Gystoseira 

 of tilt' Mediterranean and the Atlantic Coast of France. His work 

 includes a consideration of the vegetative structure, the iridescence, the 

 aerocysts, the cryptostoniata, the fructification, and the dehiscence. 

 The thirty-three species recorded in De Toni's Sylloge Algarum from 

 this region are reduced to sixteen good species and four doubtful ones. 

 Several new names are created according as the confusion regarding the 

 identity of old species makes this necessary. Diagnoses and a table for 

 the determination of species are given. The paper is a valuable 

 addition to algology. 



Conceptacles of the Fucaceae.t — W. Nienburg publishes the result 

 of an examination into the earliest stages of the development of con- 

 ceptacles in Fucaceie. The sul)ject has arisen from time to time, but 

 has not been investigated with sufficient thoroughness up to the present. 

 Nienburg has obtained material of eight genera : — Fucus, Felvetta, 

 Ascophi/Uum and Fi/oiojjhf/ciis, Himanthalia, Cystoseira, Halklrys, and 

 Sariiassum. The belief hitlierto has been that the conceptacle was- 

 formed by the arrested growth of a superficial initial cell, the walls of 

 the conceptacle being formed by the subsequent continued development 

 of the surrounding cells. The author of this paper finds, however, 

 that the earliest stages of the conceptacle, always situated in the apical 

 depression of the alga, show an initial cell which divides in a different 

 manner, according to its genus. Tiie eight genera examined may, 

 however, be classed in two groups : — 1. Cystoseira^ Halidrys, Pycno- 

 phycHs, and Sargassum with a " tongue-cell." 2. Fucus, Felvetia, and 

 Asco^jJii/lfum without a " tongue-cell." HmanthaUa stands alone with 

 a somewhat primitive character. Nienburg's conclusions agree with 

 the grouping of Oltmann's, based on vegetative structure and the 

 apical cell. 



Cutleria.J— S. Yamanouchi follows up his preliminary studies on 

 Outleria, published a few years back, bv a complete account of his 

 investigations on Ciifleria and Aglaozonia. For Outleria there is de- 

 scribed the mitosis in the vegetative cells of the male and female plants, 

 the formation of the male and female gametes, the fertilization and the 

 germination of the fertihzed female gametes, and the germination of 

 the unfertilized female gametes ; foj- Aglaozonia, the mitosis in the 

 vegetative cells, and the formation and germination of the zoospores. 

 Finally, there is a brief discussion of the cytological phenomena and 

 the ahernation of generations. The nuclear conditions in the fife- 

 history of C. mulfifida are summarized as follows : — 1. The nucleus of 

 both male and female plants contains twenty-four chromosomes, and 

 the male and female gametes contain tlie same number. '2. In the 

 union of gametes the number is doubled, and forty-eight chromosomes 

 appear in the sporelings, which develop into the Aglaozonia form of 



* Bull. Stat. Biol. d'Arcachon, xiv. (1911-12) 424 pp. 



t Zeitschr. Hot., v. (1913) pp. 1-27 (figs, ir text). 



i Bot. Gaz., liv. (1912) pp. 441-502 (10 plr and figs, in text). 



April 16th, 1913 



