196 



DE CANDOLLES SYSTEM. 



USES. Agaricus campestris, the common Mushroom, and 

 some other species of the same gemis, Tuher cibarium, the 

 Truffle, and many others, are eatable and nutritious. Others 

 are dangerous poisons. Amadou is made from Boletus 

 igiiiarius. Great numbers are mischievous parasites, infesting 

 both live and dead organized matter, and even attacking 

 living insects. Vast damage is committed by them under 

 the name of Mildew, Ilust, Brand, Smut, and Dry-rot. 



TYPICAL GENERA. Agaricus, Geastrum, Mucor, Hypoxy- 

 lon. 



342. Arcyria flava. 343. Geastrum multifidum. 344. Mucor caninus. 345. 

 Basidia and cystidia of an Agaric. 346. Agaricus cepjcstipcs. 347. Vcrmicularia 

 tnchella. 348. Vertical section of Hypoxylon punctatum. 349. Angioridium sinu- 

 osum. From Greville's Cryptogamic Flora. 



