THE FUNGI WHICH CAUSE PLANT DISEASE 347 



It is found in the uredinial and telial stages on Hydrangea on 

 which it may be quite serious. ^"^ 

 P. goeppertianum (J. Kiihn.) Kleb. 



I. (=JE. columnare) on Abies leaves. Ill on Vaccinium. 

 The aecial stage is the destructive form. It has been found 



Fig. 253. — Melampsoridium, section through genninating 

 telium. After Tulasne. 



but a few times in America,^'" "" while the telial stage is common. 

 Fig. 252. 

 P. pustulatum (Pers.) Diet. (=P. abieti-chamaenerii, P. epi- 



lobu.) 



and I on Abies. II and III on Epilobium. 

 P. pad! (Kze. & Schm.) Diet. 



1 (=iE. strobilinum) on fir. 

 II and III on Prunus padus. 



P. myrtilli (Schm.) Arth. is found in the uredinial and telial 

 stages on various Vacciniums. 



Melampsoridium Klebahn (p. 341) 



0. Pycnia flattened-conoidal, without ostiolar filaments. 



1. ^cia erumpent, subcylindrical. Peridium regularly dehis- 

 cent, cells rhomboidal. Spores ellipsoid to globoid; wall colorless, 

 thin, verrucose except one side which is thinner and smooth. 



11. Uredinia somewhat erumpent. Peridium firm, dehiscent 

 by central pore; peridial cells isodiametric, those of orifice pro- 



