PENICILLIUM AND AGARICUS 



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. 42. Agarictts cainpestris. 



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

 from a mycelium (my), and expanding into the pileus (/), on the under 

 side of which are the radiating lamella. 



B, transverse vertical section of a lamella, showing the hyphce (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 two 

 sterigmata (sty), each bearing a spore (sp). 

 (B and c after Sachs.) 



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

 vestigated by cutting thin sections of various parts and 

 examining them under a high power. 



