234 BOTANICAL GAZETTE [SEPTEMBER 
a new monotypic genus (Exogone), which the author refers to the Rhizinaceae; 
the material on which the new genus is based was found growing on partially 
decayed leaves of cabbage——T. Maxrno (Bot. Mag. Tokyo 23:59-75. 1909) in 
continuation of his studies on the flora of Japan describes several new species and 
proposes a new monotypic genus a of the Celastraceae, based on 
Elaeodendron japonicum Franch. & Sav.—W. SuKATSCHEFF (Jour. Bot. St. 
Pétersb. 3:124-136. 1908) gives an account of an alga recently discovered in 
Lake Lunoevo, Russia, for which the author proposes the generic name Lunoevia; 
illustrations supplement the description—V. L. Komarov (Acta Hort. Petrop. 
29:179-362. pls. 5-20. 1909) presents a monographic treatment of the genus 
Caragana, in which 56 species are recognized, 27 being new to science; the genus 
has its distribution through central Asia and China.—E. B. Copetanp (Phil. 
Jour. Sci. 4:1-64. pls. 1-21. 1909), in an article entitled ‘‘Ferns of the Malay- 
Asiatic region, part I,” including all families of ferns for the region except Hymen- 
ophyllaceae and Polypodiaceae, recognizes 22 genera, to which are referred 196 
species. The genus Cyathea dominates, being there represented by ror species. 
Each genus is illustrated by reproduced photographs, but from rather fragmentary 
material.—C. B. Rosrnson (ibid. 69-105) records for the Philippine Islands three 
species of the Chloranthaceae, of which one is new, and some 55 species of the sec- 
tion Phyllanthinae of the Euphorbiaceae, of which 21 are new to science:—R. 
MUSCHLER bes ool 43: Pes 1909); ander the title “‘Sytematische und pflan- 
Senecio-Arten,” presents a detailed 
cdnsideration of the genus, as ae pertains to Africa, eee about 500 species, 
28 of which are here described for the first time.—H. D. HousE (Ann. N. Y. Acad. 
Sci. 18:181-263. 1908) presents a monographic treatment of the North American 
species of Ipomoea, in which 17 5 species and several varieties are recognized, 3° 
being new. The author gives concise keys, rather full synonomy, and numerous 
species of Lathyrus from New Masieg aa M. G 
Cy y of a Drosera hybrid.—Since the dita’ announcement of 
ROSENBERG’s work on the hybrid Drosera longifolia X rotundifolia, cytologis of 
have awaited with some impatience the more detailed account, which has ae 
appeared.’ —_ Besides giving a comparative study of the external features of = 
two parents and their hybrid, the present paper describes the behavior of < 
chromosomes in critical phases of the life-history of both parents, and gives 
extended account of the chromosomes of the hybrid. 
ss sera 
OSENBERG, O., Cytologische und morphologische Studien iiber ” pt 4. 
loner Kungl. Svenska Vetenskapsakad. Handl. 4321-64 pls. 
1909 
