396 



UREDINEAE. 



Jun. viri/iiiltinii, and Jiai. phoenicea. (A reported occurrence on 

 Pint'* liiili'itnixlx is probably an error.) 



The sporogeuous cushions are little dark-brown protuberances 

 which break forth in spring from swellings, or on green 



FIG. 230. Gymnosporanffium sabinae on twigs of Jua i/m-Hx &t/i<nn, at the time 

 of liberation of spores, (v. Tubeuf phot.) 



twigs and scale-leaves. These bodies absorb water, swell, and 

 run together, forming transparent gelatinous masses (Figs. 230 

 and 231). The teleutospores resemble those of (7. juniperinum, 

 but have only four germ-pores ; they germinate on the 

 gelatinous masses, and produce promycelia and sporidia. The 

 latter germinate at once, chiefly on leaves of Pyrus coin- 

 munis. The pycnidia are produced on the upper epidermis 

 as sticky yellow spots bearing darker dot-like pycnidia. The 

 aecidia (Unroll I in nin<-t'll<<l<i) are found in September on the 

 under-surface of the leaves of pear, also on leaf-petioles, young- 

 shoots, and even on the fruits. The peridia differ from both 



