THE FUNGI WHICH CAUSE PLANT DISEASE 371 



base by 3-4 mm. high, often confluent, light chestnut-brown; telio- 

 spores 2-celled, narrowly ellipsoid, 18-26 x 50-65 n, narrowed at 

 both ends, slightly tjonstricted at the septum; wall pale cinnamon- 

 brown, 1-1.5 n thick; pores two in each cell, near the sep- 

 tum. 



I. jEcia on Amelanchier, Peraphyllum, quince and pear. 



III. Telia on Juniperus spp. 



Range; Alberta, south to Colorado and Arizona. 



G. japonicum Syd. ^^^ 



I. iEcia (=R. koreaensis), on Pear. 



III. Telia on Juniperus. 



This form has been imported into America. 



G. torminali-juniperinum (Ed.) Fischer. 



This species has its secial stage on species of Sorbus and its 

 telia on Juniperus in Europe. It is closely related to G. cor- 

 nutum of the northern part of our own continent, and of 

 Europe. 



G. yamadse Miyabe. Only the aecia of this species have been 

 found. It infests the apple and various other species of Mains in 

 Japan. 



Uromyces Link (p. 355) 



0. Pycnia spherical with minute ostioles. 



1. iEcia with peridia, spores without pores. 



II. Urediniospores generally with many germ pores, unicellular, 

 spherical, ellipsoid or variously shaped, usually rough. 



III. Teliospores unicellular, pedicellate, with an apical germ 

 pore. 



The unicellular teliospores may be distinguished from uredinio- 

 spores by their single apical germ pore, also usually by their 

 thicker walls and absence of the roughness so characteristic of 

 urediniospores. 



The genus is a very large one, with hundreds of species, which ex- 

 hibit hetercecism, autcecism, biologic specialization and the various 

 types regarding spore forms that are noted on pages 324-327. 



U. appendiculatus (Pers.) L6v.^*' 



I. iEciospores angularly globose, whitish, slightly punctulate, 



