THE I'AKAsnir EXOASCEAE. 1-17 



According to Sadebeck, the Exoascecu may lie divided as 

 follows : 



Exoascus. 



Tin- mycelium peivnnates in the tissues of twi^ or hud. The 

 subcuticular mycelium is developed from the pereniiatiii- one, and 

 becomes completely divided up, without any differentiation, into 

 a-eogenous pieces. The species an- all parasites and produce 

 hypertrophy of leaves, tlowers, and shoots. 



A. The mycelium peremiates in the inner tissues of the 

 shoot. Thence, in tin- next vegetative period, it sends branch c> 

 into the leaves in process of development, at first into the 

 inner tissues, but later subcuticular for the formation of re 

 productive parts of the fungus. 



(1) AM i developed in the carpels, which in conseiiuem e 

 become hypertrophied ; asci with a stalk-cell: K. pruni 

 Puck. E. AW ////* /'<//<//* Sad. K. communis Sad. K. 

 Farlovrii Sad. E. rhizipes Atk. E. A, ///////< .s Atk. E 

 confusus Atk. E. ceddomophilus Atk. 



(2) Asci developed only in the foliage leave.-. 



(a) Asci with stalk-cell: /:'. insititicu Sad. /.'. 



(Fuck.). E. nanus (Job.). E. deformans (Berk.) /.'. 



decipiens Atk. E. acerinus Klia. 

 c'') A<ci without stalk-cell: E. purpurascens (Mil. and 



Ever.). E. aesculi (Ell. and Ever.). 



(3) A>ci developed on leaves and fruits. 



(") Asci with stalk-cell: /;. mirabilis Atk. 

 I 1 .. The mycelium peivnnate- in the bud- of ho-i-phint- 

 and Issues thence in the next vegetative period to de\eloj in 



leaves, .subcuticular oidy. 

 < 1 i Asci only on the t'olia-e lea\ 



("> Asci with a stalk-cell: E. crotaegi (Fuck.). E. minor 

 Sad. E. Tosguinetii (West.) E. < t >l,>h >////>< Sad. /.' 

 twrgidus Sad. E. betuliniis (b'o.-tr.). E. "//<//M/S- (.loh.i. 



c'-i A-ej \\itlioiit a stalk-cell : E. i;i,-/>in l.'n-tr. E. /""i, //'- 



"Y" /'////'.s (.loh.). E. Km,!,!! \'\\\\\. 



(-) Asej on carpd-; without -talk-cell: E. nlni incanac 

 Kiihn. E. Jbhansonii Sad. E. ////:////</, >^ (.loh.i. 



(3) .Msi'elilllll 'Jl'o\\- inteivelllllal 1\. E. , >:.f. (.loll. 



