﻿510 Ellis and Everhart : New Species of 



Perithecia punctiform, minute, (. 1 2- 14 mm. in diameter), scat- 

 tered rather thickly over the stems, raising the epidermis into 

 minute pustules : sporules elliptical or oblong-elliptical, brown, 

 12-iSx 8-10/i. 



Diplodixa Populi E. & E. 



On dead, decorticated limbs of Popidus angustifolia, Fort Collins, 



o., April, 1898 (Prof. C. S. Crandall). 



Perthecia scattered, semi-erumpent, subglobose (250-300//) or 



00-400 



or slightly clavate-oblong, faintly uniseptate, hyaline, straight or 

 nearly so, 8-1 ox 2-2.5 • 



* 



Hendersonia diplodioides E. & E. 

 On dead, decorticated limbs of Populus angustifolia, Fort Collins, 

 Colo., February, 1898 (Prof. C. S. Crandall). 



Perithecia thickly scattered, semi-erumpent, small (150-250//), 

 ovate-globose, with a small papilliform ostiolum : sporules abund- 

 ant, smoky-brown, subhyaline, oblong-elliptical, 1-3- (mostly 1-) 

 septate, not constricted, 6-9x3-3.5//. 



The perithecia are often elliptical (on a horizontal section) and 

 more or less depressed. 



DIDYMOCHAETA gen. nov. Sacc. & Ell. 



(Sphaeropsidaceae, Sphaeroideae.) 



Perithecia erumpent, subsuperficial, globose-conoid, membrano- 

 carbonaceous, black, pilose or setose ; sporules oblong-cylindrical, 

 uniseptate, hyaline. 



The genus exactly corresponds to Pyrenochacta, Chactomdla 

 and Chactodip/odia, among the Hyalodidymae. 



Didymochaeta Americana Sacc. & Ell. 



Perithecia gregarious, erumpent, globose or obtusely conoid, 

 black, .25-.35 mm. in diameter, sparingly clothed with rather short, 

 septate, brown bristles : sporules cylindric-oblong, straight, rounded 

 at the ends, uniseptate, and mostly broadly constricted or nar- 

 rowed in the middle, hyaline, 8-15 x 3-4//, exceptionally 15-20X 

 5-6 ft : basidia inconspicuous, very short. 



On dead stems of Frascra speciosa, Colorado (Bethel, no. 44 0- 



