290 



the other species of Melampsora, occurring on Populus,.on the basis of 

 its morphological character. The uredosori are surrounded by a circle 

 of large whitish paraphyses. The teleutosori are placed like small 

 brown crusts on the under-side of the leaves. 

 Populus alba &■ alba X fremula, common. 



1367. Melampsora cylindrica (Strauss) Rostrup (77 b ^" 5.02 a ^^^). 



Its uredosori occur in great numbers on the lower side of the lea- 

 ves of Populus, the uredospores are lengthened, almost cylindrical, 

 and their membrane is furnished with coarse prickles. The teleutosori 

 are only to be found on the upper side of the leaves. Most damaging 

 to the cultivated species of Populus. June— October. 



Populus angulata, balsamifera, candicans, onfariensis, trichocarpa, very com- 



1368. Melampsora 

 pinitorqua Rostrup 

 (90a^"-™),Syn:Cae- 

 oma pinitorquum Al. 

 Braun, Knaekkesyge- 

 svamp, Lit: R 83 d "\ 

 89 a ^° c. icon., 02 a 

 ^^"-^'"c. icon., 04 a =2. 



The fungus is able 

 to kill trees not excee- 

 ding 1—3 years, when 

 over 10 years they are 

 no longer affected. 



Pinus montana. J. St. 

 Boust, Ulvehus (Vide- 

 baek), Dronninglund, As- 

 aa (Colding), Hagild- 

 gaard, Femhejsande (I. P. 

 Bang) , Margrethelund, 

 Rindsholm (Gad), Skovs- 

 gaard by Viborg, Sofiens 

 dal, Klelund Plantage 

 (Fritz), Hoisted (Fritz); 

 F. Lundeborg; S. Tisvil- 

 de. Pinus silvestris. J. St. 

 Restrup (1874 P. E. Mul- 

 ler), Silkeborg, Sofiendal ; 

 Sams0 Brattingsborg (Exc. 

 26/7 87); F. Lundeborg. 

 Fig. 25. Melampsora pinitorqua. Populus fremula & candi- 



Pinus silvestris with caeoma. -{-. Caeomaspores enlarged. cans, common on the 



From R 02 a. same localities. 



