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CORRELATION OF CERTAIN ]LONG-CYCLED AND SHORT- 
CycLep Rusts. 
H. C. TRAVELBEE. 
When in 1897 Dietel, in his work ‘‘The Uredinales” for “Die natiirlichen 
Pflanzenfamilien”’ of Engler and Prantl, pointed out the remarkable simi- 
larity between the teliospores of Puccinia Mesneriana Thiim., on Rhamnus 
and those of Puccinia coronuta Cda. and Puccinia coronifera WKleb. on 
grasses, which have their wecia 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 (Schum.) Korn. which has Rwmesxr 
for its zcial host. In both of these cases we note the teliospores of a short- 
cycled rust appearing on the ecial host of a long-cycled hetercecious rust. 
The teliospores of the two species are morphologically alike although 
appearing on host 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 hetercecious species of Puccinia, two of Chrysomyxa, one of 
Melampsora and one of Coleosporiwm, all haying short-cycled forms ap- 
pearing on their ecial 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 the 
forms correlated in this manner were known at the time the observations 
were made. 
When in 1903 and 1904 Tranzschel connected into a hetercecious 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, A. punctatum Pers., on Anemone 
ranunculoides, and was endeavoring to find its alternate host. He observed 
that on Anemone nemorosa there appeared a short-cycled Puccinia, P. 
*Beitrage zur Kryptogamenflora der Schweiz. 1:109. 1898. 
