152 ASCOMYCETKS. 



The Exoasceae may be grouped, according to the symptoms- 

 of the disease produced, as follows ; for this purpose we shall 

 class all the ■ species as one genus, ' Eocoascus ' (or Taphrina) : 



I. Species which cause deformation of the ovary or other part 

 of the fruit. 



E. pruni (Fuck.) on Prumis domestica, P. Padiis, P. vir- 



giniana. 

 E. Rostrupianus (Sad.) on Pmmis spinosa. 

 E. comrminis (Sad.) on Prunus pumilla, P. maritima, P. 



nigra, P. americana. 

 E. Farlovni (Sad.) (E. varius, Atk.) on Pnmus serotina, 



causing also deformation of twigs. 

 E. longipes (Atk.) on Prunus americana. 

 E. confusus (Atk.) on Pruniis virginiana. 

 E. rhizipes (Atk.) on Pruntos triflora. 

 E. cecidomophUus (Atk.) on insect-galls on the fruits of 



Prunus virginiana. 

 E. mirabilis (Atk.) on Prunus angustifolia, P. Jwrtulana^ 



P. americana. 

 [Also species on Prunus subcordata, P. Chicasa, and P. 



peniisylvanica.] 

 E. alni incanae (Ktihn) {E. amentoriim, Sad.) on Alnvs 



incana. 

 E. alni glutinosae (Tubeuf) on Alnus glutinosa. 

 E. Eohinsonianus (Giesh.) on Alnus incana. 

 E. Johansonii (Sad.) on Populus tremula, P. tremuloides, P. 



grandidentata. 

 E. rhizophoonis (Johan.) on Populus alba. 



II. Species which (1) produce witches' brooms, or (2) at least 

 cause deformation of shoots ; asci produced on the leaves. 



(1) E. epiphyllus (Sad.) {E. borealis, Johan.) on Alnus 



incana (uniform grey coating of asci on both sides. 



cf leaf.) 

 E. turgidus (Sad.) on Betula verrucosa (coating of asci on 



under surface accompanied by slight crumpling of 



leaf). 

 E. hetulinus (Eostr.) on Betula piibescens and B. odorata 



(coating of asci on under surface). 



