186 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Corethromyces Stilicolus nov. comb. 



Stichomyces Stilicohis Thaxter. 



This species which, in view of its single free antheridia, I formerly 

 placed provisionally in Stichomyces, was found frequently in the 

 vicinity of Buenos Aires on several species of StUicus, and an examina- 

 tion of sufficient material shows that, although the species tends to 

 produce its antheridia singly, or free in groups, the intercalary arrange- 

 ment also occurs, and there can be no doubt but that the form is con- 

 generic with the other Stilicus-inhabiting species of the genus. The 

 Argentine specimens are similar in all respects to those first obtained 

 on StUicus at Arlington, Mass. 



Corethromyces pygmaeus nov. sp. 



Perithecium becoming rather deeply suffused with dull reddish 

 amber-brown, asymmetrical; the basal cell-region small and hardly 

 distinguished, one of its cells usually bulging externally to form a 

 distinct prominence; the ascigerous portion, usually rather abruptly 

 inflated externally, the apex of the curvature forming a more or less 

 well distinguished hump, the inner margin usually straight; the tip 

 broad not distinguished, the apex truncate, subtended externally by 

 a rather abrupt rounded prominence: stalk-cell suffused, becoming 

 concolorous with the perithecium, usually strongly curved inward, 

 distally broader below the base of the perithecium, from which it is 

 distinguished by a very slight constriction, and which it nearly equals 

 in length. Axis of foot at right angles to that of the basal cell of the 

 receptacle, which is twice as large as the somewhat flattened subbasal 

 cell; externally strongly concave, its inner margin convex, sometimes 

 distally constricted on its inner side, a deeply suffused outgrowth 

 arising from its outer upper angle; almost uniform in width above its 

 narrower base, extending outward then upward abruptly beside the 

 two basal cells of the appendage, sometimes bent inward near its 

 rounded tip. Basal cell of the appendage large, nearly spherical; 

 the subbasal cell small and surmounted by several hyaline branches, 

 one or two of which may extend nearl}- to the tip of the perithecium. 

 Perithecium 58-66X24-28 fi: stalk-cell 40-60X20 m- Spores 26 X 

 2.5 M (measured in perithecium). Receptacle 20X 12 /z, its outgrowth 

 20-30X5 At. Total length of appendage 30-40 m- Total length to 

 tip of perithecium 100 fx. 



