_ 266 BOTANICAL GAZETTE [MARCH 
followed the nucleus in the oogonium of Cystosira from the young resting stage 
to synapsis, metaphase of the first division, and second and third divisions. 
The number of chromosomes in the first division he reports to be 18-20. He 
compares the figures of the first division with those of vegetative divisions, 
and because of the appearance of a much higher number of chromosomes in 
the vegetative figures, he infers that 18-20 is the reduced number. Further, 
upon comparison with the case of Fucus, he infers that the oogonium of Cysto- 
sira and Sargassum may represent the x-generation. The development of the 
sporelings of Sargassum is discussed in comparison with Srmons’ work on 
another species of the same genus. The reviewer thinks that it is very desira- 
ble to have more detailed accounts of the events occurring in the oogonium 
of these forms and of the processes connected with the development of a 
normally fertilized or a parthenogenetic egg.—S. YAMANOUCHI. 
Spermatogenesis in liverworts.—WoopsuRN,” while studying sperma- 
togenesis in Porella, traversed the work of IkENo, EscovEz, and SCHAFFNER in 
Marchantia polymorpha and that of BoLLeTER in Fegatella conica for evidences 
of centrosomes. In none of the forms studied did he find any evidence of cen- 
trosomes. Although occasional granules were found in the cytoplasm, or in 
the region of the spindle, they did not present the appearance of or behave 
like centrosomes. He concludes that if a body does sometimes occupy the 
pole of a spindle it does not imply that it is any more a centrosome than the 
other bodies scattered through the cytoplasm. He says that the blepharoplast 
develops de novo from a dense granular or spherical mass, kinoplasmic in 
origin, located usually «at the most distant angle of the spermatid. The 
— erage a cord, growing in close contact with the plasma mem- 
rane. “cytoplasmatischer Fortsatz”’ of IkENo is merely a 
part of te oer Nothing whatever corresponding to a “Neben- 
kérper” was found. He concludes that the sperm at maturity represents the 
two pies cell elements, nucleus and cytoplasm; that the main body of the 
cell represents the nucleus; that the blepharoplast and cilia represent special- 
ized cytoplasm; oe that the remainder of the cytoplasm is found in the 
vesicle—W. J. G 
Records of Oenothera.—Gares* has undertaken to trace the history of 
species of Oenothera in cultivation, particularly the large-flowered forms. This 
involved a critical examination of the records through three centuries, begin- 
ning with TourNEFoRT’s Institutiones. The pertinent evidence is recited from 
the documents in detail, and the conclusion reached that ‘“‘a form closely 
resembling O. Lamarckiana was the first Oenothera introduced into Europe 
23 WoopBuRN, W. L., Spermatogenesis in certain Hepaticae. Ann. Botany 25: 
299-313. pl. I. 191. 
24 Gates, R. R., Early historico-botanical records of the Oenotheras. Proc. Iowa 
Acad. Sci. 17:85-124. pls. 6. 1910 
