Minnesota Plant Diseases. 



181 



exceedingly poisonous and fungus eaters must take good care 

 that they are familiar with the poisonous varieties found in the 

 state. (Figs. Frontispiece. 6 to 8, 10, 18, 20, 81, 86 to 89, 116, 

 128 to 132.) 



Puff-balls and their allies (Gasieromycefes). All of the re- 

 maining basidium-bearing fungi have closed fruiting bodies. 

 The basidia are borne inside of this structure either in palisades 

 lining the surface of chambers or in irregular fashion on loose 

 threads throughout the fruiting body. The latter arrangement 



FlC. 90. A group of the common crnimnl puff-ball* ( I.ycupcrtlon ftrmmalum) jul lirfure 

 iipc-ning; the | sin. 'ii of ihc future opening sctn at the ilarkrnnl t'-i'- <>f the 

 fruiting budiis. Original. 



is prevalent in the wefted pufT-bnIls (including the first, second 

 and third of the following groups), while the remaining groups 

 possess the palisade arrangement of basidia. The fruiting body 

 always possesses one or more covering membranes. These 

 fruiting bodies may remain closed until the membranes de- 

 cay, when the spores are released, or they may open in charac- 

 teristic ways, by pores or by splitting, and thus allow of the es- 

 cape of the spores. In most forms the interior of the fruiting 

 body partially disintegrates, leaving only the spores in a line dust 

 held in a loose weft of long and strong thread> which give the in- 

 terior a sponge-like texture. The spores are then thrown out in 



