Murrill: Agaricaceae of Tropical North America 81 



17. Agaricus guadelupensis Pat. Bull. Soc. Myc. Fr. 15: 



197. 1899 



Described from specimens collected 'by Duss on the ground 

 among rubbish near dwellings in Guadeloupe. The description 

 seems to place it midway between Agaricus and Lepiota. I 

 have not examined the type specimens. 



18. Agaricus Shaferi sp. nov. 



Pileus convex to expanded, solitary, 10 cm, or more broad; 

 surface dry, whitish or pale-yellowish, densely covered with con- 

 spicuous, light-bay^brown scales ; margin entire, concolorous ; 

 lamellae free, rather crowded, blackish-brown at maturity ; spores 

 broadly ellipsoid, smooth, opaque, darknpurplish-brown under 

 the microscope, 5X3.5/*; stipe tall and thick, enlarged at the 

 base, whitish, filbrillose, 15 cm. long, 3-4 cm. thick; annulus ample, 

 membranous, white, persistent, attached very near the base of the 

 stipe. 



Type collected in soil near Laguna Herradura, Pinar del Rio, 

 Cuba, December 12, 191 1, /. A. Shafer 1126c). Known only from 

 the type locality. This species is readily distinguished by its large 

 size and conspicuously scaly surface. Unfortunately, the col- 

 lector pressed his specmiens flat and made very brief notes ; but 

 it would seem a pity not to recognize such a splendid plant. 



Doubtful and Excluded Species 



Agaricus Sallei Berk. Ann. Mag. Nat. Hist. II. 9 : 193. 1852. 

 Known only from specimens collected on dead wood in Santo 

 Domingo by Salle. It is described as acutely umfoonate, with 

 minute, branlike scales, 8 cm. hroad; stipe 10 cm. long and 5 mm. 

 thick, spores broadly ellipsoid, nearly straight on one side, purple- 

 brown, 11 X8/x. Berkeley thought it was a species of Lepiota 

 before he examined the spores. The fact that it grew on dead 

 wood and was acutely umbonate would indicate that it hardly 

 belonged to Agaricus. No mention is made of striations on the 

 surface. 



Agaricus yucatanensis Ellis & Ev. Field Columb. Mus. Bot. ser. 

 1, 285. pi. 8. 1896. Described from specimens collected on 



