Murrill: Agaricaceae of Tropical North America 2d 



Psathyrella modesta (Berk.) Sacc. Syll. Fung. 5: 1133. 1887. 

 (Agaricus modestus Berk. Lond. Jour. Bot. 1 : 453. 1842.) De- 

 scribed from specimens collected by Hinds on stumps in New 

 Guinea. Reported from St. Vincent by Massee in 1892. I have 

 not examined Massee's specimens. 



5. Psilocybe (Fries) Quel. Champ. Jura Vosg. 116. 1872 



Agaricus § Psilocybe Fries, Syst. Myc. 1 : 289. 182 1. 



This difficult genus differs from Atylospora in having the 

 margin of the pileus incurved when young, and from Campanu- 

 larius in having purplish-brown instead of black spores. It is 

 well represented in temperate regions. 



Pileus white, becoming brown; stipe white to fulvous. i. P. palmigena. 

 Pileus rosy-isabelline ; stipe subconcolorous. 2. P. orizabensis. 



Pileus fulvous; stipe white. 3. P. dichroma. 



Pileus brown ; stipe concolorous. 4. P. plutonia. 



i. Psilocybe palmigena (Berk. & Curt.) Sacc. Syll. Fung. 5: 



1049. 1887 



Agaricus palmigena Berk. & Curt. Jour. Linn. Soc. 10: 292. 

 1868. 



Collected only once by Wright on palm stumps in woods in 

 Cuba. The spores are ellipsoid or ovoid, smooth, distinctly 

 purplish-brown under the microscope, 7 X 4-5 ^- The lamellae 

 are described as free, while the type specimens are too poorly 

 preserved to show their attachment. 



2. Psilocybe orizabensis sp. no v. 



Pileus conic, not expanding, not umbonate, solitary, 1.5 cm. 

 broad and high ; surface smooth, glabrous, not striate, uniformly 

 rosy-isabelline; margin entire, concolorous; lamellae adnate, 

 crowded, broad, whitish at first, becoming dark-isabelline with a 

 rosy tint; spores oblong-ellipsoid, smooth, opaque, dark-chestnut 

 under the microscope, about 12 X 6/x; stipe slightly larger below, 

 smooth, glabrous, paler than the pileus, rather brittle, 5 cm. long, 

 1.5-2 mm. thick. 



Type collected in soil at Orizaba, Mexico, 1,200 m. elevation, 

 January 10-14, 1910, W . A. & Edna L. Murrill 771 (herb. N. Y. 

 Bot. Gard.). 



