xxv.] CORN MILDEW AND BARBERRY BLIGHT. 207 



spores was made by Professor De Bary with Puccinia tragopo- 

 gonis, Corda, the assumed result being ^cidium tragopogonis, 

 Pers. The latter is abundant in this country, but the former, 

 illustrated from a continental example in the left-hand figure of 

 Fig. 90, has never yet been found in Britain. A second species 

 of Puccinia, however, named P. sparsa, Ck. , is found both in 

 Britain and on the Continent on Tragopogon. This has rough 

 or slightly echinulate spores, and is illustrated in' the right- 

 hand figure of Fig. 90. Dr. M. C. Cooke maintains the dis- 



X-SOO 



FIG. 00. 



Teleutospores of Puccinia tragopogonis, Corda, and P. sparsa, Ck. 

 Enlarged 500 diameters. 



tinctness of the two fungi, and P. sparsa, Ck., is retained as a 

 species in the Mycologia Scotica. Many botanists, both British 

 and Continental ; look on the two parasites as quite distinct, 

 but the advanced advocates of hetercecism now say they are the 

 same, and term both P. tragopogi, Pers., although Persoon 

 never gave this name. 



We have not heard whether ^Ecidium tragopogonis, Pers., 

 follows the germinating spores of Puccinia sparsa, Ck., on 

 goats-beard, if it does, and the two species of Puccinia are 

 distinct, the case is similar with the one mentioned by Pro- 

 fessor W. G. Farlow, where spermogones appeared on pear 

 leaves after the application of the germinating spores of two 

 species of Gymnosporangium and one of Podisoma. 



