80 BOTANICAL GAZETTE [yory 
Trees and shrubs.—The second part of the second volume has followed’ 
the first part promptly, and is devoted to species of Crataegus and Viburnum. ~ 
SARGENT describes 10 new species of Crataegus, 7 of which are from Missouri; q 
while REHDER presents and illustrates 13 species of Viburnum from China and 4 
Japan, 3 of which are new. The species of Viburnum are followed by a synopsis | 4 
of the genus as displayed in eastern Asia, sf species being recognized under 9” : 
sections, and g of these species are new.—J. M 
Cytology ot geotropism.—GrorGEVITCH contributes little that is new by his” 
study of the cytology of roots of Lupinus albus when stimulated by gravity.° 
He correlates, much as Némec did, though with differences in detail, the aggrega 
tion of the protoplasm and the position of the nucleus with geotropic stimula 
are 
contents of normal and stimulated roots. It is not possible, however, to say whi it 
these mean.—C. R. B 
Sexuality in Ceratiomyxa.—OLiveEs’ has shown that the cleavage of the plas: 
claimed by Fammyrzin and Worontn. Toward the close of the cleavage stage — 
there is a fusion of nuclei in pairs, followed almost immediately by synapsis and 
two rapidly succeeding divisions, which are regarded by the author as reduction 
divisions, and give rise to four-nucleate spores.—CHARLES J. CHAMBERLAIN. 
Dumortiera autoicous.—Erwnst reports in a preliminary papers* that Java 
material of Dumortiera trichocephala (commonly) and D. velutina (spa 
have both antheridia and archegonia on the same receptacle, though on diffe 
lobes. A single instance of the same thing has been observed (hitherto oa 
lished) by Dr. W. J. G. Lawn, of the University of Chicago, in Mexican ma 
of D. hirsuta collected at Xalapa, V. C.—C. R. B. 
Anatomy of Isopyrum.—Hoim® has added Isopyrum biternatum to his ana 
tomical records, including with the anatomical details a discussion of geogr@ 
distribution and generic limitations.—J. M. C. 
55 SARGENT, C. S., Trees and shrubs. Illustrations of new or little known ig ie 
plants, prepared chiefly from material at the Arnold Arboretum of Harvard Univer 
ol. II. Part. II. pp. 57-116. pls. 126-150. Boston and New York: Hougt 
Mifflin, & Co. 1908. 00. 
56 GEORGEVITCH, PETER M., Cytologische Studien an den geotropisch Be 
Wurzeln von Lupinus albus. Beihefte Bot. Cent. 221:1-20. pl. I. 1907- 
_ 7 Ottve, Epcar W., Cytological studies on Ceratiomyxa. Trans. Wis. 
Sci. pick take pl. 47. 1907. 
58° ERNS r androgyne Inflorescenzen bei Dumortiera. Ber- 
Bot. Gesells. ‘Os: pee pl. 13. 1907. 
5° Hotm, Tueo., Isopyrum biternatum T. & G.; an anatomical study. Am. “ 
Sci. IV. 25:133-140. figs. 3. 1908. 
