188 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Closely allied to the last species, which grows in a similar position 

 on another species of Stilicus; but readily distinguished by its sigmoid 

 habit, and the different structure of its appendage and perithecium. 



Corethromyces uncigerus nov. sp. 



Perithecium rather bright translucent reddish amber, somewhat 

 concave and more deeply suffused on the inner side, rather strongly 

 convex externally, the basal cells clearly defined, subtriangular in a 

 compact group, the basal cell-region not distinguished from the asci- 

 gerous portion, which tapers distally to its peculiarly modified tip, 

 the blackish suffusions of which extend to an opaque, hook-like pro- 

 longation which, bending at right angles, forms a lid immediately above 

 and often partly concealing the hyaline apex: the stalk-cell nearly 

 hyaline, variously, often greatly, elongated, curved, or often straight 

 and erect; distally broader than the basal cell-region, from which it 

 is thus separated by a more or less pronounced constriction. Subbasal 

 cell of the receptacle relatively large, hyaline, subtriangular, the 

 basal cell narrow below, smoky, extending obliquely upward to the 

 base of the appendage where it is continued by a deeply suffused 

 broad straight erect upgrowth, which is flattened against the ap- 

 pendage, and extends to or beyond its subbasal cell. Basal and 

 subbasal cells of the appendage subisodiametric and subequal, or 

 the basal larger and longer, the subbasal appearing to bear from its 

 broad distal surface, a small tuft of hyaline, rather short branches 

 and branchlets. Spores 26X2.8 /jl. Perithecia 70-85X20-26 ij.; 

 its stalk-cell 50-125 X 15 /jl, distally, 20 ^u broad. Appendages, longer, 

 75 /x. Receptacle, including foot, 30-40 fx, its outgrowth 30-60 /x. 

 Total length to tip of perithecium, 150-250 fx. 



On the posterior legs of Stilicus elegans Lynch, No. 1994, not 

 uncommon at Llavallol, and easily distinguished by the peculiar tip 

 of its perithecium which recalls that of Chitouonv/ces psittacopsis or 

 of C. Bullardi. 



Corethromyces armatus nov. sp. 



Perithecium nearly uniform dull purplish amber-brown, the basal 

 cell-region not distinguished, or somewhat paler and very slightly 

 narrower than the ascigerous part above; the inner margin slightly 

 convex, the outer strongly so distally, the tip broad undifferentiated; 

 the apex broad, flat, subtended internally by a rounde.d projection 



