MUSHROOM. 



I. External Characters. 



Note': 



1. The vertical stalk, or stipe. 



2. The umbrella-like cap, the pileus. 



3. The ring, or annulus, around the stalk, the 



remains of the membrane, the velum, con- 

 necting the pileus with the stipe and torn 

 by the extension of the pileus. 



4. The underground mycelium from which the 



stipe arises. 



5. On the lower surface of the pileus radiating 



vertical plates or lamellae. 

 Sketch. 



II. Structure. 



Tease out in ivater a piece of the stalk. 



1. Note the hyphge of which it is composed. 

 Sketch. 



Examine under the low poiver the surface of a 

 lamella. 



2. Note the spores ; sometimes in groups of, 



four. 



Cut in pith cross-sections of a lamella. 

 Note: 



3. The centre of the lamella, made up of hyphae 



running parallel to the surface. 



43. 



