26 



Mycologia 



unidentifiable. Our collections contain the following species, de- 

 termined by Miss Burlingham. 



Lactaria insulsa Fries, Epicr. Myc. 336. 1838 

 Collected in a moist virgin forest at 5,000 ft. elevation near 

 Jalapa, Mexico, W. A. & Edna L. Murrill 127. Pileus depressed, 

 the surface marked with narrow zones varying in tone, as in 

 New York specimens. 



Lactaria subdulcis (Pers.) Fries, Epicr. Myc. 345. 1838 

 Collected on dead trunks of tree ferns in the Cockpit Country, 

 Jamaica, at 2,000 ft. elevation, Murrill & Harris 876, 1021. It 

 is rather difficult to account for the presence of this temperate 

 species in a locality so different from its usual surroundings. 



Russula mexicana Burlingham sp. nov. 



Pileus convex to depressed, 6 cm. broad ; surface smooth, dry, 

 pale-red, with inseparable pellicle, striate at the margin ; context 

 white, 5 mm. thick at the center, promptly and decidedly acrid in 

 taste ; lamellae adnate, equal, white when young, becoming pale- 

 yellow at maturity; spores subglobose, echinulate, pale-yellow, 

 7-8 fi ; stipe stout, cylindric, glabrous, roseus, 4X2 cm. 



This species is related to R. palustris Peck, described from New 

 York, which differs in its separable pellicle and tardily acrid flesh. 

 The above diagnosis was mainly drawn from the field notes and 

 colored sketch accompanying the specimens. 



Type collected near Jalapa, Mexico, on humus under the end 

 of a log in rather open woods, December 12-20, 1910, W . A. & 

 Edna L. Murrill 160. 



Tribe AGARICEAE 

 This tribe comprises all the remaining fleshy gill-fungi, or 

 those having the hymenium truly lamellate and the context com- 

 posed of slender, elongate cells. Earle has recently published 

 in the Bulletin of the New York Botanical Garden an exhaustive 

 treatment of the genera of the gill-fungi of North America, with 

 descriptions and keys, to which the student of this group is 

 referred. 



