OYMNOSPORANGILM. 



39; 



the species already described in remaining closed at the apex, 

 the spores escaping through trellis-like slits on the lateral walls 

 of the peridia (Fig. 234). 



This fungus will not germinate on apple-trees, but on pears 

 every leaf may be thickly covered with aecidia and pycnidia, 

 and considerable damage to the crop thereby ensue (Fig. 233). 



Fig. 231. — Lougitudinalscctiou through 

 a conical teleutospore-sorus of Gymno- 

 sporangium Sabinae. (After Woernle.) 



Fio. 2;i2.— Teleutospores of 0. mbiiwr. 

 The elongated thin-walled ones arc 

 lighter in colour than the thick-walled. 

 (After WoenUe.) 



Infections on various hosts with Gymno>ipumn(jium sabinae 

 from JwiiiJem.s Sahina gave : 



Spore-form. Authoritv. 



I 



On Host-plant. 

 Pyrus communis, 

 Crataegus Oxyacantha, 

 Mespilus gennan ica, - 

 Pynis communis, 

 Pyrus communis, 



„ Mic/iau.rii, 



„ tomentosa, 

 Pyrus commicnis, 

 Pyrus communis, 

 Crataegus Oxyacantha, 



(0 



Postelia cancellata. 



Plowrifrht. 

 Oerstedand De lijiry. 

 Ratliay, Tubeuf, etc-. 



Eeess. 



E. Fi.scher. 

 Klebahn. 



,, (uncertain). 



