192 



PENICILLIUM AND AGARICUS 



LESS. 



pestris) these lamellae are pink in young specimens, and 

 afterwards become dark brown. 



The mushroom is too tough to be readily teased out like 





FIG. 41. Agaricus campcslns. 



A, Diagrammatic vertical section, showing the stalk (st) springing 

 from a mycelium (;//?'), and expanding into the pileus (/), on the under 

 side of which are the radiating lamelke (/). 



B, transverse vertical section of a lamella, showing the hyphaj (hy} 

 turning outwards to form the layer of club-shaped cells (a) from which 

 the sterigmata spring. 



C, one of the club-shaped cells (a), highly magnified, showing its t\\<> 

 sterigmata (iV^), each bearing a spore (.t/h 



(p. and c after Sachs. 



the mycelium of Penicillium, and its structure is bust in- 

 vestigated by cutting thin sections of various parts and 

 examining them under a high power. 



