358 



THE FUNGI WHICH CAUSE PLANT DISEASE 



Triphragmium Link (p. 354) 



Teliospores 3-celled, one basal, two apical, each cell vnth one 

 or more germ tubes. 



T. ulmarise Schm. occurs on Ulmaria in England and at one 

 station in America. 



Phragmidium Link (p. 354) 



0. Pycnia present. 



1. iEciospores in basipetal chains. The first two spore forms 



FiQ. 259. — Triphragmium ulmaris, germi- 

 nating teliospore. After Tulasne. 



Fig. 260.— Phragmi- 

 dium bulbosum, 

 teliospore germi- 

 nating. After Tu- 

 lasne. 



are in pulverulent sori, surrounded by clavate or capitate, hyaline 

 paraphsrses. 



II. Urediniospores single. 



III. Teliospores separate, pedicellate, consisting of from three 

 to ten superimposed cells, the uppermost of which has a single 

 apical germ pore, the others about four each, placed laterally. 



The aecial stage is a Caeoma but with a border of incurved pa- 



