PILOSACE— AGARICUS. 409 



Pilosace, Fries, Nova Symb., p. 9 ; Cke., Hdbk., p. 196. 

 A peculiar genus, with the habit of Agaricus, but without 

 a trace of a ring. 



Pilosace Algeriensis. Fr. (figs. 6, 7, p. 351.) 

 Pileus 3-4 in. across, hemispherical with the margin 

 incurved, becoming depressed round the gibbous disc, and 

 with the margin more or less upturned and often split, 

 snow-white, minutely silky ; flesh thick except at the margin, 

 firm, white ; gills distant from the stem, narrow, rather 

 distant, slightly broadest in front, dark purple ; stem 2-3 in. 

 long, A in. thick, equal, firm, even, silky, white, differentiated 

 from the flesh of tlie pileus at its apex, solid ; spores pip- 

 shaped, brownish- purple, 16-18 x S fx. 



Pilosace Algeriensis, Fries, Hym. Eur., p. 283; Cke., 

 Hdbk., 13. 196; Cke., Illustr., pi. 618. 



On the ground. Has up to the present only been found 

 in one locality, but as it is difficult to distinguish in the 

 field from Agaricus campestris, except in the absence of a ring, 

 it may possibly have been passed over for that species. 



AGARICUS. Linn, (emended), (figs. 1, 2, p. 351.) 



Pileus fleshy ; gills free from the stem, whitish or pink, 

 finally dark reddish-brown or umber ; stem usually differen- 

 tiated from tlie flesh of the pileus, furnished with a ring ; 

 spores brownish or reddish-purple. 



Agaricus, Linn., Syst. Nat. (1735), (in part). 



Agaricus, subgen. Psalliota, Fries, Hym. Eur., p. 278; 

 Cke., Hdbk., p. 192. 



As previously explained, the genus Agaricus as interpreted 

 by Fries, was by that author divided into several subgenera, 

 and the original name Agaricus has been retained for those 

 species included in the subgenus Psalliota of Fries. 



Agaricus as here understood, is analogous with Lepiota in 

 the white-spored series. There is no trace of a volva at any 

 stage of development. The species are terrestrial, mostly 

 growing in open pastures and on manured ground ; some 

 species, however, occur in woods, and one small exotic sjiecies, 

 A. geniculatus, Briganti, grows on wood. 



