2 7 6 



PUCCINIMI. 



PART II. 



tissues of the plant on which it feeds, and distorts or 

 kills it. Occasionally, the chlorophyll in the leaves is 

 oxidized, and becomes yellow by the oxygen which the 

 parasite absorbs. 



The Entophytes, which constitute the second group of 

 parasites on living plants, form microscopic congrega- 

 tions in the interior of the leaves and tender shoots, the 

 only indication of their existence being a white, red, or 

 orange coloured spot, which usually becomes black or 

 brown when the fungus attains maturity. It appears 

 that the same individual of these entophytes may assume 

 two or more different forms during the course of its life, 

 and bear two or more totally dissimilar types of fructi- 

 fication. Of these, the 

 sub-orders Puccinise and 

 Uredines furnish many 

 examples. 



Fig. 32 represents va- 

 rious species of Pucci- 

 nisei, which consist of a 

 thread ending in club- 

 shaped or elongated cells 

 called asci, containing a 

 definite or indefinite num- 

 ber of septate conidia or 

 spore dust cells. Each 

 order of plants, as the 

 Rosacese, has its own form 



Fig. 32. Puccinisei: a, Aregma speciosmn; r? ,-i -, T 



t, Xenodochus paradoxus ; c, Puccinia Of tnese entophytes. ' In 



Amorphse; d, Triphraemium dubens ; e, XT, ~ J.*~ f i ( 



Young spores of an unknown Puccinia;/; the tlSSUe Of a rOS6 leaf, 



immediately beneath a 



bright golden coloured surface spot, M. Tulasne found 

 two distinct forms of fungi, living together in a 

 small cavity. The forms were exactly those of a Puc- 

 cinia and Uredo. The Puccinia consisted of a short 

 colourless stem, ending in a club-shaped cell, con- 



