i68 



Minnesota Plant Diseases. 



plants a great variety of forms — usually from club-shaped or 

 cylindrical to ear-shaped and shelf-like. Many of them are 

 very irregular in form and much convoluted, forming brain-like 

 masses, while still others have a surface furnished with teeth in 

 an exactly similar fashion to those of the true tooth-fungi. 

 They are all, however, gelatinous and this character is due to 

 the same structure of the threads as was described for the 



Fio. 80. — A trembling fungus (Tremella sp.), on the end of a log. The portion 

 of the fruiting body near the top has partially decayed and deliquesced. (In the center 

 of the cluster are two white caps of a gill fungus.) Original. 



Jews' ear fungus. From the latter and from the true palisade 

 fungi the trembling fungi differ in their basidium. This is 

 formed directly from the ends of threads as in the Jews' ear, 

 but the walls, which divide up the basidium into cells are longi- 

 tudinal or oblique and the basidium itself is spherical or pear- 

 shaped, while in the former groups the basidium was cylindrical 



