210 PTJCCINIA 



every year; infection l>y over-wintered uredospores has been proved by 

 Tranzschel to be possible, l>ut as Brooks shows I. c. it id probably rare, 

 because the plum-leaves are generally aol affected until summer is well 

 advanced. Fresh infections of the Anemone can, of course, be produced 

 by the basidiospores of the over-wintered teleutospores. 



The distinction usually made, by describing the uredospoie> a> 

 " echinulate," and the teleutospores as " verrucose," does not convey the 

 exact truth ; the markings on both art- very similar, but the warts of 

 the uredospores are sharp-pointed and usually turned downwards, while 

 those of the teleutospores are often blunted, and always darker and more 

 crowded. 



The brothers Sydow describe a second form of uredospore, which I 

 cannot find. The two cells of the teleutospore separate with the greatest 

 readiness, and the lower cell which is very often paler and imperfect, 

 could then be easily mistaken for a uredospore and has been so described 

 and figured. The true uredospores, mentioned in the description, are very 

 similar to amphispores, and have been mistaken at times for paraphyses. 

 The teleutospores are attached by short fragile pedicels in bunches to 

 a common basal cell. This is one of the characters of Arthur's genus, 

 Tramschelia. 



Arthur describes (North Americ. Flora, p. 150) a second species of 

 Tramschelia (P. cohaesa Long, from Texas), agreeing in almost every 

 minute detail with P. Pruni-spinosae, but having all its four spore-forms 

 upon Anemone decapetala. In its teleutospores P. fusca (q.v.) agrees 

 exactly with both of these, so that /'. cohaesa may be regarded as a 

 primitive form, from which both the others have been evolved. See 

 Grove, New Phytologist, 1913, p. 89. 



Jacky (Centralbl. f. Bakter. 2. viii. 658) divides P. Pruni-spinosae into 

 two forms : /. typiea, in which the teleutospore has both cells alike, on the 

 three species of Prunes mentioned ; and /. discolor, in which the teleuto- 

 spore is thickened above, and the lower cell is paler, narrower and 

 imperfect, on Amygdalus communis and P. Persica, less often on the other 

 species. On P. Armeniaca both forms are found. This difference is by no 

 means constant, however, and is hardly worthy of mention. 



Distribution : Europe, North and South America, Africa 

 and Australia. 



80. Puccinia Rhodiolae B. et Br. 



/'»ccinia Rhodiolae B. et Br. Ann. Nat. Hist. ser. 2, v. 462. Cooke, 

 Handb. p. 505 ; Micr. Fung. p. -111. Plowr. Ured. p. 207. Sacc. 

 Syll. vii. 701. Sydow, Monogr. i. 491, f. 401. 



