Murrill: Agaricaceae of Tropical North America 81 



Agaricus (Naucoria) arenicola Berk. (Fungi Zeyh. no. 6). 

 Reported by Fries from Oersted's collections in Costa Rica, but 

 very probably different from the South African species. Oer- 

 sted's figures are unsatisfactory and no specimens are to be 

 found. 



Agaricus (Naucoria) cerodes Fries, Epicr. Myc. 195. 1838. 

 Reported from Santo Domingo, but probably another case of 

 incorrect determination. 



Agaricus {Naucoria) coprinoceps Berk. & Curt. Jour. Linn. 

 Soc. 10: 290. 1868. Collected by Wright in Cuba. Spores too 

 dark for Naucoria; probably a Psathyra, one of the brown-spored 

 genera. 



6. CoRTiNARius (Pers.) Roussel, Fl. Calvados ed. 2. 61. 1806 



This very large and difficult temperate genus has been divided 

 comparatively recently along the subgeneric lines laid down by 

 Fries, but for our present purpose, where only one or two spe- 

 cies are concerned, it seems best to retain the old name and to 

 omit synonyms. 



Cortinarius mexicanus sp. nov. 



Pileus convex, solitary, 4 cm. broad; surface pallid with a lilac 

 tint, ferruginous in places, slightly viscid when moist, margin 

 even; lamellae slightly arcuate, adnexed or rarely free, close, 

 regular, deep-lilac; spores boat-shaped, slightly one-sided at one 

 end, regular, minutely echinulate, ferruginous, 11-12 X 4-5i(>t; 

 stipe shining-white with a lilac tint, this tint deepening above, 

 cylindric, abruptly bulbous at the base, 5 cm. long, about 6 mm. 

 thick; veil fibrillose, evanescent, soon ferruginous from the 

 spores. 



Type collected on humus in a moist virgin forest at Jalapa, 

 Mexico, December 12-20, 1909, W. A. & Edna L. Murrill ip/. 



Doubtful Species 



Cortinarius Sintenisii P. Henn. Engl. Jahrb. 17 : 498. 1893. 

 Collected by P. Sintenis on trunks in Porto Rico, and said by 

 the author to be allied to C. cinnani omens. The type specimens 

 have not been examined. 



