20 Bulletin 313 



Taphrina aurea (Pers.) Fries. — On the leaves and inflorescence 

 of the Populus. Causes a blistered appearance and covering of 

 golden powder. Asci attenuated at base and immersed in the 

 matrix, sometimes clavate, apex truncate, length 92-100 x 16-25 fi; 

 spores globular, numerous and variable in size. 



56. Asci and ascospores, 1/12. 



Taphrina coerulescens (D. & M.) Tul.— Causes bluish blisters 

 on the oak; asci elongated, broadly cylindrical, 55-78 x 18-24 ju., 

 spores breaking up into numerous small, condidia. Our material 

 corresponds quite well with the original description {Ascomyces 

 ccerulescens) . 



57. Asci and ascospores, 1/12. 



Taphrina cerasi (Fck.) Sad.^On the leaves of the cultivated 

 cherry. Causes a deformation resulting in a witch's broom. Asci, 

 25-33 x 6-9 /x; stalk cells, 10-17 x 5-7 /x; asci round or oval and 

 approximately 8 in number. 



58. Asci and ascospores, 1/12. 



Taphrina deformans (Fcl.) Tul. — On the leaves, young fruit, 

 twigs of the peach. Causes leaves to curl, frequently becoming 

 pink or yellowish, and causes blisters on twigs and fruit. Asci are 

 formed just below the cuticle on the lower surface. They are cylin- 

 drical to slightly clavate, the ends rounded or truncate, 25-40 x 

 8-11 fi; the stalk cells, 6-8 x 6-10 /*; frequently tapering towards 

 the base ; 4-8 asco-spores are sub-globose or oval and measure 3-5 x 

 4-6 fx. They frequently go through a process of budding either 

 before or after escaping, and produce conidia. 



59. Infected peach leaf. 6(). Asci and ascospores, 1/12. 



Taphrina pruni (Fckl.) Tul. — On plums and cherries. Causes 

 the "plum pockets," a bladdery-like growth of the fruits, and also 

 attacks very young shoots. The asci are formed early in great num- 

 bers, breaking through and almost destroying the cuticle. Asci 

 long and cylindrical, 30-60 x 8-15 fx; spores 8, globose, 3.5-5 /*. 



61. Infected plum fruit. 62. Asci and ascospores, 1/12. 



