ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 189 



Pure Cultures of the Lower Algae. * — Prof. R. Chodat and M. 

 Grintzesco find a medium containing gelose very favourable for pure 

 cultures of many of the lower Algte, which were obtained free from 

 Fungi and Schizouiycetes. The authors were able to confirm Chodat's 

 previous statement of the polymorphism of many of the Protococcacese, 

 especially of Scenedesmus acutus. 



Variations in the Structure of a Green Alga in Different Media. f 

 — L. Matruchot and M. Molliard describe the changes effected by growth 

 in or on various media in a unicellular alga, Stichococcw bacillarig. 

 They extend to the form and size of the cells, to their grouping in 

 colonies, and to the number and form of the chloroleucites, there 

 being only one in the normal aerial form of the alga. No septation of 

 the cell was in any case observed, and there was never more than a 

 single median nucleus. 



Fungi. 



Reproduction of Polyphagus Euglenae-I — Prof. P. A. Dangeard 

 gives a detailed account of the life-history of this parasite on Euglena. 

 The discovery of cysts with a single nucleus, but externally like the 

 zygospores, is interesting ; the occurrence of both cysts and zygospores 

 in one species has not been previously observed in Chytridineae. The 

 gametes are at first without any sexual attraction, which developes after 

 a vegetative period, and Dangeard finds in this a confirmation of his 

 view that sexual phenomena merely express a particular phase of the 

 general nutritive life. In regard to the nuclear fusion, it is pointed out 

 that the two nuclei of the zygospore appear to be mutually indifferent 

 for a long time ; attraction is manifest only at the moment of germination. 



New Genera of Fungi. — In an account of the parasitic algae and 

 fungi of Java, M. Raciborski § describes a large number of new species, 

 and the following new genera, of fungi : — 



Goplana g. n. forms a connecting-link between the Uredinefe and the 

 Auriculariaceae, between Stypinella and Coleosporeum. Balladyna g. n. 

 (Perisporiaceaa) is characterised by stalked peritheces containing a single 

 ascus. Anliellia g. n. (Myriangeas), parasitic on leaves of a Vaccinium, 

 producing black hypodermal apotheces. Lambro g. n. (Hypocreaceae), 

 allied to Polysti<jma and Valsonectria. Konradia g. n. (Hypocreaceaa), 

 epiphytic, with rusty black fructification, and ascopores at first filiform, 

 then breaking up into spherical fragments. Mendogia g. n. (Hysteriaceaa), 

 distinguished from Hysterographium by having several peritheces in the 

 stroma. Iridyonia g. n. (Phaeidiaceas) ascospores fusiform, 2-celled, with 

 one or two spines at the end. SMerhia g. n. (Uredineae), allied to 

 Hamaspora, but with 1-celled sessile teleutospores. Kordyana g. n. 

 (Exobasidieae), founded on Exobasidium Tradescantise. Lelum g. n. 

 (Exobasidieaa), producing galls on a Persea. Beniowskia g. n. (Fungi 

 imperfecti), parasitic on leaves of Panicum nepalense. 



* Arch. Sci. Phys. et Nat., x. (1900) pp. 386-7. 

 + Comptes Rendus, cxxxi. (1900) pp. 1248-51. 



% Le Botaniste (Dangeard), vii. (1900) pp. 213-57 (2 pis. and 3 figs.). 

 § Parasit. Algen u. Pilze Javas, ii. and iii., 46 and 49 pp., Batavia, 1900. See 

 Bot. Centralbl., lxsxiv. (1900) p. 316. 



