ZOOLOGY AND BOTANY. MICROSCOPY, ETC. 179 



inhabited. Not many collections from the Atlantic Coast have been 

 examined, but both fecidia and teleuto-soii have been seen from vaoit of 

 the States, from Maine to Delaware. So far the secidial stage of the 

 rust has been found on eighty-four host species in fifty-two genera 

 belonorincf to nineteen different families. A. L. S. 



*o'"o 



New Species of Uredinese. XI. — The new species now published by 

 J. C. Arthur (Bull. Torrey Hot. Club, 1919, 46, 107-25) have been 

 collected from widely different localities in, America — from Porto Rico, 

 Florida, Colorado, etc., though most of them are from Mexico. The 

 species belong to Pucciiiia, Uromyces, Uredo and JEcidium. Comparative 

 notes are given with the diagnoses. A. L. S. 



Parasitism of Puccinia. — The discovery of a strain of stem rust 

 on Triticum compactum which did not normally infect a number of 

 varieties of hard spring wheat led to an examination of the differences 

 between the two strains by Julian G. Leach {Phytopathology, 1919, 9, 

 59-88, 2 pis.). The points- chiefly investigated were the comparative 

 infection capabilities of the two strains ; the degree of constancy and 

 individuality of the new strain ; the desirability of finding other host 

 varieties differing in degree of resistance ; and, finally, the investigation 

 of the basic factors underlying the action of the two forms in order to 

 throw light on the varietal resistance and biologic specialization. Many 

 experiments were made, and a list is finally given of the wheats that 

 react differently to the two parasites. The new rust, Puccinia tritici- 

 compacti, was proved to be a distinct and constant biologic form. There 

 follows a discussion on the phenomena of immunity and susceptibility. 



A. L. S. 



British Rust Fungi. — A list of rust fungi from Scotland more or • 

 less new to Britain has been published by Malcolm Wilson (Journ. 

 Bot., 1915, 53, 43-9). T\iQS,Q2iVQ Puccinia Prostii on t\\Y\^^ ; P.horealis, 

 the aecidial stage of which was described by Greville, on Thalictrum 

 (yE. Tlmlittri) ; Puccinia septentrionalis, the teleutospores of which 

 were found on Polygonum vivipanmi, on Ben Lui ; P. Anthoxanthi, 

 previously recorded by Plowright from King's Lynn, now found on 

 Ben Lui and Ben Voirlich ; and Melajnpsora alpina on Salix herhacea, 

 also found on Ben Lui from July to October. 



A second paper by Wilson {Journ. Bot., 1919, 57, 161-3) gives 

 iurther information on rust fungi. The author has found the secidial 

 stage of Melampsora alpina on Saxifraga oppositifolia. It grew on Ben 

 Lui in July and August. He has also found in abundance the secidia 

 of Piwcinia borealis, not recorded since Greville's day. Uromyces 

 Onobrychidis, a new fungus for Britain, grew on Onobrychis sativa at 

 Favershamj Kent. Notes are also published of other species. A, L. S. 



Mycological Contributions. — In this paper a number of subjects 

 are dealt with by Ed. Fischer {Mitt. Naturforsch. Gesell. Bern, 1917 

 (1916), 125-63, 6 figs.). He describes the results obtained by him in 

 inoculation experiments with the Uredine Thecopsora sparsa, the teleuto- 

 ispore and uredospore stages of* which are found on Arctostaphylos sp. 



