TAXONOMY 
207 
Gorgonzola and Stilton cheeses. It possesses blue-green globular 
conidia 4 to 5 m in diameter. 
Penicillium camemberti is the principal agent in the ripening of 
Camembert cheese. It possesses ellipsoidal bluish-green conidia 
4.5 to 5. 5 m in diameter. 
Fig. 87. — Three aerial hyphae showing the characteristic brush-like branching 
and spore formation of Penicillium glaucum. This fungus si a true saprophyte 
and is never found on living fruits or vegetables, a, Conidiophore branching 
above into secondary conidiophores; b, sterigmata; c, conidiospores. ( Schneider .) 
Penicillium brevicaule grows on old moist paper and has been used 
to detect the presence of arsenic, for when grown in media contain- 
ing this element, it develops the compound, diethylarsine. It is 
yellowish-brown in color and its conidia are rough and spiny. 
