Minnesota Plant Diseases. 



177 



and the tinder fungus, may be mentioned as a few of the numer- 

 ous common forms of these pore fungi. In addition to the gelat- 

 inous and tough and fleshy pores are the beefsteak fungi which 

 are very soft; in these the pores with their surrounding walls 

 are free from each other and look like small dependent tubes 



Fig. 



-A stick-dwelling gill fungus (Lenzites betulina), on a dead branch of 

 Original. 



birch. 



hanging from the fruiting body. Most of these forms are edi- 

 ble. Somewhat similar to these are the species of Boletus, all of 

 which are fleshy and grow on the ground, often in swampy 

 places. The pores are here also found in tubes which separate 

 from each other readily and the tubes are combined into a sep- 

 arate layer. The pores are usually large and the fruiting body 

 always possesses a central stalk and mushroom-like ' cap. On 

 the under surface of the cap are found the pores. The pore 

 surface is sometimes enclosed in young stages by a veil-like 



