ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 347 



Puccinia Malvaceariim and the Mycoplasm Theory. — M.A.Bailey 



{Ann. Jjot., 1020, 34, 173-200). The ^Yriter^s aim was to test Eriksson's 

 repeated statement that rust persisted in plants as a mycoplasm in the 

 seed. He grew different series of hollyhocks from seed — a certain number 

 of plants in the open, others in enclosed globes protected from infection. 

 All the plants in the open became infested with hollyhock rust ; those 

 in the globes were free from disease until finally they were sprayed with 

 rust spores. An account of these experiments is given and the results 

 tabulated as regards the various plants. All disease was proved to arise 

 from external infection and in no case to come spontaneously from a 

 mycoplasm in the cells. A. L. S. 



Heteroccism and Specialization in Puccinia Caricis. — Jakob 

 Eriksson (Eev. Gen. Bot., 1920, 32, 15-8). By a series of inoculation 

 experiments Eriksson has proved that Puccinia Caricis is a collective 

 species and includes a number of biologic forms, and several different 

 forms may be found on the same species of Car ex and the same species 

 of Bibes, the alternate host. A. L. S. 



Facultative Heteroccism in Peridermium cerebrum and Peri- 

 dermium Harknessii.— E. P. Meinecke {Phytopathology, 1920, 10, 

 279-97). Meinecke distinguishes sharply between the two Peridermiiun 

 species. The last-mentioned is now confined to the gall forms on 

 mountain pines, and produces uredinia and teleutospores on Scrophu- 

 lariacea?. Peridermivm cerebrum forms galls on pines of the Pacific 

 coast ; the alternate hosts are Quercus spp. A. L. S. 



Puccinia graminis on Berberis canadensis. — E. C. Stakman and 

 L. J. Krakova {Phytopatholoyy, 1920, 10, 305-6). A research was 

 undertaken to determine if Berberis canadensis would prove to be an 

 alternate ho&t to Puccinia graminis. The workers found that the Berberis 

 in question was badly rusted and that the rust spread to wheat. They 

 recommend the eradication of the bushes which are especially abundant 

 on limestone formations. A. L. S. 



^cidial Form of Uromyces Genistse-tinctoriae. — P. Dietel {Ann. 

 Mycoh, 1919, 17, 108-9). The a^cidial form of this rust develops 

 on Euphorbise. The author proved this by inoculation experiments ; 

 he describes the type of deformation on the Euphorbia plants caused 

 by the fungus. A. L. S. 



New or Noteworthy North American Ustilag-inales. — ■ H. S. 

 Jackson {Jlycoloyia, 1920, 12, 149-56). The writer reports for the 

 first time in North America the bunt of rye, TiUetia Secalis ; it had been 

 collected in 1892 by L. M. Underwood at Syracuse, New York. A new 

 species, Crocystis Trillii, on Trillium chloropetalum forms conspicuous 

 sori on the leaves. Another new to America is Sorosporium Junci, two 

 collections of which were made on Juncus bufonius in Oregon. 



A. L. S. 



Biology of Fomes applanatus. — J. H. White {Trans. Roy. Canad. 

 Inst., 1920, 12, 133-74, 2 figs., 6 pis.). Fomes applanatus has been 



