ZOOLOGY AND BOTANY, MICKOSCOPY, ETC. 79 



after the beginning of the experiment. It was evidently induced by 

 continued warmth and an alkaline medium, the action of which, in part 

 at least is to cause softening of the wall of the spore. 



Uredinese.* — P. Dietel has described a series of new species of 

 Uredineae from Chili and Brazil, in South America. In most cases he 

 is dealing with only one form of the rust. 



J. Ivar Liro| gives an account of experiments with the rusts of 

 Finland. For a number of forms he establishes the limits of growth, in 

 others he confirms previous findings, and he gives also an account of his 

 negative results. He experimented with Melampsora Larici-tremulce, 

 P actinia JEcidii-melampyri, P. JEcidii-rumicis, Uromyces Trifolii, Oymno- 

 sporangium, and Gronartium. 



J. C. Arthur % treats of the Coleosporiaceas, Uredinaceae, and 

 iEcidiaceae in the recent issue of the North American Flora. He 

 describes many new species. A number of names have been changed. 

 The new genera are Necium, Gionothrix in the Uredinaceee ; Cy sting ophora, 

 Dicheirinia, and Discospora in the xEcidiaceae. 



P. Magnus § publishes a note on the nomenclature of some recent 

 species of Uromyces on Papilionaceae. They have been wrongly named, 

 and Magnus corrects the errors. 



J. C. Arthur || gives an account of his cultures of Uredinege in 1906, 

 the seventh series of such reports. Many of the cultures yielded nega- 

 tive results, and these are also recorded. One of the most interesting 

 discoveries was the autcecious nature of flax rust, Melampsora Lini. 

 This gives a good prospect of stamping out the rust by destroying the 

 old flax straw on which the fungus lives during the winter. 



A new species of Diorchidium is described by Th. Wurth.1T The 

 fungus causes deformations of the host-plant, especially of the leaf- 

 stalk. The teleutospores of this fungus are vertically septate, giving two 

 cells on one stalk ; occasionally a third cell was formed at the side of the 

 others. The new species is D. Koordersii. 



Klebahn** publishes a series of twenty-six culture experiments with 

 various Uredineae. Some of these are amplifications or verifications of 

 previous work, others deal with new questions of relationships and 

 biological species. In his examination of Phragmidium Rubi, he 

 remarks that though the many species of Rubus are closely related and 

 difficult to separate, yet the fungus is very constantly selective in the 

 species on which it grows, infecting some richly and dying out on others. 



Rene Probstft gives a series of results obtained with culture experi- 

 ments of Uredineaa on Compositse. He found four specialised forms 

 within the species Puccinia Hieracii. He found also that P. Leontodontis 

 grew only on Leontodon hispidus ; that P. Hypochocridis was distinct 



* Aim. Mycol., v. (1907) pp. 244-6. 



t Acta Soc. F. & Fl. Fenn., xxix. No. 6 (1900) 25 pp. See also Ann. Glycol., 

 v. (1907) p. 301. 



X North American Flora, vii. (1907) pp. 83-100. See also Bot. Centralbl., cv. 

 (1907) pp. 136-7. § Ber. Deutsch. Bot. Gesell., xxv. (1907) p. 340. 



|| Journ. Mycol., xiii. (1907) pp. 189-205. 

 1 Hedwigia, xlvii. (1907) pp. 71-5 (4 rigs.). 

 ** Zeitschr. Pflanzenkr., xvii. (1907) pp. 129-57. 

 + t Centralbl. Bakt., xix. (1907) pp. 543-4. 



