ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 635 



Liagora and Galaxaura.* — F. K. Butters publishes some notes on 

 the species of Liagora and Galaxaura of the Central Pacific, founded 

 on collections made by Tilden and others. Thirteen species of Liagora 

 and 12 of Galaxaura were present. A key is given to the sections 

 of Liagora, one being new, the Corymbose. Five new species and 

 one new variety of Liagora are described. The author follows Kjell- 

 man in his divisions of Galaxaura, to which genus he adds two new 

 species. 



Formation of Spermatia in Delesseria sanguinea.f— N. Svedelius 

 has made a further study of Delesseria sanguinea, and describes in the 

 present paper the formation of its spermatia. The male frond when 

 fully developed lacks the distinct midrib, and is covered on both sides 

 by a close and connected sorus of spermatangia. Each spermatangium- 

 mother-cell produces more or less simultaneously two spermatangia. The 

 development of spermatangia in L. sanguinea differs markedly from that 

 of the NitophyllejB, in which only one spermatangium is found at a 

 time. Thus in the family of Delesseriaceas at least two different types 

 of spermatangial development occur. In the first as well as in the 

 second division of the spermatangium-mother-cell, the nucleus undergoes 

 a typical division with 20 chromosomes, which therefore remains the 

 number of chromosomes of the definitive spermatium. The somatic 

 nuclei of the male plant have also 20 chromosomes, and the nuclear 

 division is the same in the somatic nuclei of both male and female 

 plants. The male plant of D. sanguinea is, like the female plant, a 

 haploid gamophyte with 20 chromosomes in all its cell-nuclei ; in con- 

 trast to the tetrasporic plant which is a diploid sporophyte with 

 40 chromosomes. 



Euzonieila incisa.:|: — L. C. Costantini writes some observations on 

 Euzoniella incisa, criticizing the work and concliisions of C. J. Conolly 

 in Flora, 1911. The latter author agrees witli Falkenberg in holding 

 that the cystocarps of E. incisa bear al)ove the carpostome a sort of long 

 plume similar to those found on the lateral branches of the alga and 

 constituting the branchlets. This was not ' observed by Harvey. 

 Costantini disagrees with Conolly as to the presence of these plumes, 

 which, as he points out, would materially interfere with the escape of the 

 carpospores. He has not found any in either mature or immature 

 cystocarps. The anatomical structure is also described. 



Life-history of Polysiphonia.§ — G. B. Pugg and A. 1). Dalgity 

 discuss in a short note the results of Yamanouchi and Lewis on the 

 alternation of gametophyte and sporophyte in the life-history of Foly- 

 siphonia, and add interesting information on results obtained by them 

 on Pterosiphonia hipinnata. This material showed tetraspores and 

 carpospores on the same individual. The tetraspores had gone to the 

 point of complete division, and the carpospores were seen issuing from 



* Minnesota Bot. Studies, iv. (1911) pp. 161-84 (1 pL). 



+ Svensk Bot. Tidskr., vi. (1912) pp. 239-65 (2 pis. and figs.). 



X Nuov. Notar., xxiii. (1912) pp. 183-94 (2 pis.). 



§ Bot. Gaz., liv. (1912) pp. 164-5. 



