ZOOLOGY AND BOTANY, MICROSCOPV, ETC. 63 



New or Noteworthy Fungi. — The study of Fungi imperfecti is 

 continued by W. B. Grove (Joiirn. Bot., 1918, 56, 340-6). Tlie list 

 includes new species, Mijxosporium Pohjgoni and 3Iarssoma Omphalodis. 

 Full descriptions are given of all the species listed. A. L. S. 



Incubation Period of Cronartium ribicola on the White Pine.— 

 E. E. Stone {Phytopathology, 1918, 8, 438-40, 1 fig.) has published 

 •observations on the appearance of secidia on the white pine, the 

 Cronartium stage of which grows on Ribes cynosbati. Ribes plants 

 growing near the pines were heavily infected in 1914, but were removed 

 in 1915 before the leaves had unfolded. It was only in 1917, that is 

 three years after probable infection, that the pine blister rust appeared, 

 thus indicating a three-year period for incubation, or more exactly, two 

 years and nine months. In some cases the incubation period was found 

 to have been a year longer. A. L. S. 



Contribution to the Study of Uredinese. — Paul Cruchet {BvM. 

 JSoc. Valid. Sci. Nat, 1918, 51, 623-31, 3 figs.) reports the results of 

 experimentation and observation on several Uredineae, yEcidium ScilJse 

 has been known for some time ; the Puccinia stage has been proved by 

 inoculation, etc., to grow on Festuca rubra. Puccinia ^ne was found 

 by the author on Deschampsia csespitosa in its Uredo form ; he also found 

 the teleutospore stage and pubhshes the diagnosis. A new species of 

 Uredo was found on Festuca Halleri different from all known Uredineae 

 on Festuca. A. L. S. 



Rusts of North America.— J. C. Arthur and G. R. Blsby {Proc. 

 Amer. Phil. Soc, 1918, 57, 273-292) have published a translation of 

 two papers by Schweinitz on the rusts of North America. They give an 

 account of his life and activities, and give a description of the many 

 rusts collected by him, with the letterpress attached to the specimens. 

 Finally, they give lists of these rusts under their modern names, and a 

 further list of hosts, with their parasites. A. L. S. 



Overwintering of Jlciospores of Cronartium ribicola. — Louise 

 DOSDALL {Phytopathology, 1918, 8, 619) collected in 1918 seciospores of 

 Cronartium on a branch of white pine. She takes it for certain that 

 they were spores from the season 1917, and she found that 1 to 2 p.c. 

 had retained their viability and produced germ-tubes. She suggests 

 that the rust may easily overwinter in this way. A. L. S. 



Host Relationship of the North American Rusts, other than 

 Gymnosporangium, which attack Conifers. — Arthur S. Rhoades, 

 O. (t. Hedgcock, E. Bethel, and C. Hartley {Phytopathology, 1918, 

 8, 309-52) have published a detailed paper on the above subject. It 

 arose out of a tabulated account of these rusts and their relationship 

 compiled by G. Hartley as a basis for practical prophylactic work. This 

 proved to be of so much service that it has now been enlarged, and 

 includes work by the other writers. Special stress is laid on the dates 

 of infection, overwintering, etc. More than twelve genera of Uredinese 

 find hosts among Conifers. Indexes of the alternate host-plants are 

 given, and a copious bibUography. A. L. S. 



