154 ASCOMYCETES. 



III. Species which produce (1) pustule-like outgrowths, (2) 

 leaf-spot, or (3) smooth coatings of asci. 



E. aureus (Pers.) on Populus nigra (incl. jii/ramidalis) 



and P. monilifcra. 

 E. polysporus (Sor.) on Acer ta.rtaricum and A. Pscudo- 



2datanus. 

 E. hullatus (Berk, et Br.) on Pyrus communis and Ct/donia 



Japonica. 

 E. carneus (Johan.) on Betula nana, B. odorata, and B. 



intermedia. 

 E. coerulescens (Desm. et Mont.) on Qurreus pvhesccns, Q. 



sessilifiora, Q. Ccrris, Q. laurifolia, Q. ruhra, Q. tinctoria, 



Q. aqnatica. 

 E. Sadebeckii (Johan.) on Alnus glutinosa. 

 E. ulmi (Fuck.) on Ulmus campestris, U. monta/iia, and U. 



americana (spots and blisters). 

 E. virginicus (Sey. et Sad.) on Ostrya virginica. 

 E. australis (Atk.) on Carpinus americanus. 

 E. filicinus (Eostr.) on Aspidium spinulosum. 

 E. potent iliac (Farl.) on Potentilla gco'idcs, P. canadensis, P. 



sylvestris. 

 E. githaginis (Rostr.) on Agrostemma Githago. 

 E. lutcscens (Eostr.) on Polystichiim Tlielypteris. 

 E. miibellifcrarum' (Eostr.) on Heraclcum Sphondyliiim, Pcu- 



cedanum pialustrc and P. Oreosclinum,. 

 E. ostryac (Mass.) on Ostrya carpinifolia (brown spots). 

 E. betulae (Fuck.) on Bctida vrrrncosa, B. jiuhescnis, B. 



titrkestanica. (whitish spots). 

 E. Jlavus (Farl.) on Betida popidifolia, B. papyracea. 

 E. acericolus (Mass.) on Acer campestre and A. Pscudo- 



platanus. 

 E. fasciculatus (Lag. et Sad.) on Nephrodium (whitish spots). 



The following are some of the more important species of 

 Exoasceae : 



Exoascus pruni Fuck. (Pocket-plums). This attacks the 

 ovaries of Prunn.s domcstica (plum), P. Padus (bird cherry), and 

 P. virginiana, causing the mesocarp to grow rapidly, whereby 

 the fruits increase in size and become much changed in form. 



