531 



Correlation of Certain Long-Cycled and Short- 

 Cycled Rusts. 



H. C. Teavelbee. 



When in 1S97 Dietel, in his work "The Uredinales" for "Die natiirliehen 

 Pflanzenf a milieu* ' of Engler and Prantl, pointed out the remarkable simi- 

 larity between the teliospores of Puccinia Mesneriana Thiim.. on Kha/mnus 

 and those of Puccinia coronata Cda. and Puccinia coronifera Kleb. on 

 grasses, which have their aecia on Rhamnus, he established the first obser- 

 vation on correlations between rusts of widely different species. He also 

 called attention to the fact that a similar condition obtains between the 

 teliospores of Puccinia ornata Arth. & Holw. on Rumex and the teliospores 

 of the grass rust. Puccinia Phragmitis (Sebum.) Korn. which has Rumex 

 for its secial host. In both of these cases we note the teliospores of a short- 

 cycled rust appearing on the secial host of a long-cycled heteroeeious rust. 

 The teliospores of the two species are morphologically alike although 

 appearing on bost plants of quite different families. 



About this same time (1898) Fischer stated* that quite independently 

 of Dietel, he found by his researches a list of similar relationships. He 

 reported five heteroeeious species of Puccinia, two of Chrysomyxa, one of 

 llelampsora and one of Goleosporium, all having short-cycled forms ap- 

 pearing on their secial hosts, agreeing with their teliospores. He also listed 

 three Uromyces and one Puccinia which show this sort of a relationship 

 with certain micro- or hemi-forms. 



It is worthy of note here that the complete life history of all th'j 

 forms correlated in this manner were known at the time the observations 

 were made. 



When in 1903 and 1904 Tranzschel connected into a heteroeeious life 

 history two rust forms which until that time had never been suspected of 

 bearing any relationship to each other, he made a wonderful advance along 

 the line of this sort of investigation. His method was as unique as it was 

 important, and on account of the interesting field it opens for investigators 

 is worthy of detailed mention. 



He had an unconnected Aecidium, .1. punctatum Pers.. on Anemont 

 ranunculoides, and was endeavoring to find its alternate host. He observed 

 that on Anemone nemorosa there appeared a short-cycled Puccinia, P. 



*Beitr.i«e zur Kryptogamenflora der Schwciz. 1:109. 1898. 



