36 PROCEEDINGS OF THE AMERICAN ACADEMY 



On Tropisternus glaber, Connecticut. 



This species occurs with the last, but more rarely, and was at 

 first mistaken for a mere variety of it. The differences, however, 

 are important and constant, the peculiarity of structure presented 

 by the spores being unique in the group. 



CORETHROMYCES, nov. gen. 



Receptacle reduced to a basal with two or three terminal cells, 

 giving rise on one side to the free perithecium, on the other to 

 several long straight rigid cylindrical jointed appendages, which 

 bear externally at short intervals numerous secondary appendages. 



CORETHROMYCES CrYPTOBII, nOV. Sp. 



Perithecium (immature) long and narrow, the tip bent slightly 

 inwards. Primary appendages three or four in number, brownish, 

 rather closely 11-12 -septate, cylindrical, straight, tapering slightly; 

 the secondary branches simple, aseptate or pseudoseptate, some- 

 what divergent, comprising a row of larger brown appendages on 

 either side, between which arise a few smaller hyaline ones; the 

 larger appendages about equal in number to the segments of the 

 primary appendage (six to seven). Receptacle opaque above the 

 small hyaline basal cell. Primary appendages 150-160 X 8-10^.; 

 secondary appendages (longer) 100-110 X 5.6 /*,. Receptacle 75 X 

 40 jx. Perithecium (immature) 100-110 X 20 fx. 



On Cryptobium pallipes, Virginia (Pergande). 



A single immature specimen of this remarkable genus was found 

 growing on one of the posterior legs of its host. The highly differ- 

 entiated appendages are quite different in character from those of 

 any other genus. In their natural position they almost wholly 

 obscure the perithecium, and, springing from the greatly reduced 

 receptacle, present the appearance of a brush-like tuft, the true 

 nature of which is not at once apparent. 



ACANTHOMYCES, nov. gen. 



Perithecia as in Laboulbenia, clearly differentiated from the re- 

 ceptacle. Main axis of the receptacle composed of superposed 

 squarish cells, and, above its basal cell on the inner side, of a 

 series of smaller appendage-bearing cells extending up to and 

 around the base of the perithecium : the appendages simple, rigid, 

 septate. Spores as in Laboulbenia. 



