﻿440 BOTANICAL GAZETTE [june 



kept separate by other authors have been united on the principle that when 

 such forms are connected by numerous intergrading specimens they are to be 

 considered as the same species, although typical specimens of the extreme 

 forms may be easily distinguished. — C. R.B. 



A CRITICAL REVISION of the genus Eucalyptus has been undertaken by 



)vernment botanist of New South Wales and director 

 of the Botanic Gardens, Sydney. Part I of this publication has just appeared, 

 containing in the preface a discussion of the variations in the genus, and a 

 list of doubtful species referred to it and such species excluded from the 

 genus, and a bibliography. The remainder of the part is devoted to a descrip- 

 tion of Eucalyptus pibilaris : its synonymy, range, and affinities. Of the four 

 plates two are given to the typical form of the species, another to the variety 

 Muelleriana, and one to the illustration of fruits showing variation in the 



species 



NOTES FOR STUDENTS. 



Professor Bower* has announced the discovery of a sporophyll of 

 Lycopodhun rigiduni bearing two sporangia side by side. The great rarity 

 of this phenomenon emphasizes the remarkable constancy of the solitary 

 sporangium among the true Lycopodiales. — J. M. C. 



■ 



MoLisCH contends^ that the buoyancy of the Cyanophyceae of the plank- 

 ton does not depend upon gas vacuoles, and that the bodies which were so 

 interpreted by von Strodtmann and Kiebahn cannot possibly be gaseous. He 

 was not able to determine whether they were fluid or solid, but inclines to 

 the belief that they are viscous. — C. R, B. 



Holm ^ has used a study of Carex fusca and Carex bipartita as an occasion 

 for severely criticising what he calls *' type-species botany," He shows that 

 the superficial determination of herbarium specimens reputed to be the 

 type material of the older taxonomists may be very far from reaching 

 reliable results. He says that such research should include a good deal 

 more, such as a large amount of literary research, a study of the author's 

 method of describing and of citing, the history of the herbarium since it left 

 his hands, etc. — J. M. C. 



5 Maiden, J. H., A critical revision of the genus Eucalyptus, pp. 47- P^^- 4- P^*^" 

 lished by Authority of the Government of the state of New South Wales. Sydney: 

 W. A. Gullick, 1903. 2 shillings sixpence. 



^Bovver, F. O., Note on abnormal plurality of sporangia in Lycopodium 

 rigidum Gmel. Ann. Botany 17 : 278-280. 1903. 



^MoLlsCH, Hans, Die sogenannten Gasvacuolen und das Schweben gewissen 

 Phycochromaceen. Bot. Zeit. 61': 47-58. figs. 4. 16 Mar. 1903. 



^HoLM, Theo., Studies in the Cyperaceae. XVIII. On Carex fusca and Carex 

 bipartita All. Am. Jour. Sci. 15 : 145-152. 1903. 



