(From the Bulletin of the Torkey Botanical Club, 3a: 83-103. 1905.] 



The Polyporaceae of North America — X. Agaricus, Lenzites, Cerrena, 



and Favolus 



William Alphonso Mtrrili. 



Plants with variable daedaleoid or lamelloid hymenium and 

 light-colored context and spores form the subject of the present 

 article. These plants, like those of the genus Sesia discussed in 

 article IX, recognize none of the ordinary specific or even generic 

 limitations of the group and must be treated in a class by them- 

 selves. If they were amenable to ordinary methods of cultiva- 

 tion, they would surpass Oenothera in supplying most excellent 

 examples of mutation. 



Through the genus Favolus, taken up at the close of this paper, 

 we return to the normal poroid forms of the family. 



AGARICUS (Dill.) L. Sp. PI. 1176. 1753 



Striglia Adans. Fam. PI. 2: 10. 1763. 

 Daedalea Pers. Syn. Fung. 499. 1801. 

 Daedaleopsis Schroet. Krypt. Fl. Schles. 3:492. 188S. 



The type of the genus Agaricus is Agaricus quercinus L. This 

 is the only species common to Linnaeus and Dillenius, the author 

 of the genus. Primarily, the name Agaricus was applied to dimidiate 

 woody forms and the application of the present code* restores it to 

 one division of this group. It is unfortunate that the association 

 of fleshy and woody forms by Linnaeus under the name Agaricus 

 has entirely diverted it from its earlier use and made necessary a 

 number of changes in its restoration. Such changes could be 

 avoided in only one way, i. e., by applying canon 15 (f) of the 

 code, which allows a well-known economic species to be selected 

 as the type in order to avoid change in the current application of 

 a Linnaean generic name. Agaricus campestris is such a species 

 and might be adopted as the type of the genus Agaricus. I hesi- 

 tate, however, to make use of a provision designed especially for 

 Poa pratensis. I fear also that this provision, being the only one 



* Bull. Torrey Club, 31 : 249-261. 1904. 



83 



