376 UREDINEAB. 



Klebahn and Fischer^ assert that several other species of 

 Coleosporium produce their aecidium-stage on Pinus sylvestris. 



0. euphrasiae (Schum.) (Britain). Uredospores produced from 

 reddish-yellow, teleutospores from orange-red patches during 

 July and August on various BMnanthideae. (Bhinanthus major, 

 B. minor, Bartsia Odontites, and Euphrasia officirMlis). The 

 spores from Bhinanthus germinate on needles of Pinus sylvestris 

 and produce an aecidium called Periderm,ium Stahlii Kleb. 

 The aecidiospores of P. Stahlii average 26m in length, 1 9-5^1 

 in breadth, and are round or shortly oval, with a coat and 

 markings finer than those of P. oblongisporium. The uredo- 

 spores average 22/x x 15'5/x; they are irregular and somewhat 

 angular, with a thin finely marked coat. 



0. melainp3nni (Eeb.) (Britain). Uredospores on Melam- 

 pyrum (certainly on M. pratense). The aecidia — Peridermium 

 Soraueri Kleb. — follow after a year on needles of Pinus sylvestris. 

 The spermogonial pycnidia alone are developed in the summer 

 of infection. 



C. tussilaginis (Pers.) (Britain). This Coleosporium is found 

 all summer on the • underside of leaves of Tussilago farfara, 

 the uredospores forming yellow patches, the teleutospores darker- 

 coloured ones. Aecidia are produced on needles of Pinus 

 sylvestris, and are known as Peridermium Plowrightii. Pycnidia 

 and aecidia are formed in the summer following infection. 

 The aecidiospores average 25-5/u x 19m and are shortly oval 

 or round, with coats and markings more delicate than those 

 of P. Stahlii. The uredospores average 26m x 19m and are 

 roundish oval with somewhat firmer and thicker coats than 

 those of 0. euphrasiae. 



Klebahn's infections of Petasites with aecidiospores from Pinus 

 gave no result. 



C. inulae Kunz. Spores of this obtained by Fischer^ from 

 Inula Vailla7itii and /. Selenium produced Peridermium Klehahni 

 Fisch. on needles of Pinus sylvestris. 



C. sonchi (Pers.) (Britain and U.S. America). Klebahn 

 considers this as a provisional species including a number of 

 imperfectly investigated forms whose uredo- and teleutospores. 



^Berichted. deutsch. botan. Ges., 1894; Zeitschri/t f. PJlanzenkrankheiten, 1894, 

 and 1895, p. 73. 



''Botan. GentralUatt, Lix., 1894, p. 1. 



