OF ARTS AND SCIENCES. 265 



often once-septate. External to the base of each of these finger-like 

 appendages is a short projection. The outer basal cell of the peri- 

 thecium is small, sub-triaugular ; the inner continued downwards 

 beyond the outer into a rather broad pedicel connecting with the 

 receptacle. Receptacle composed of three cells : the basal simple, 

 with a small black base of attachment to the host, bearing distally 

 two cells : the outer small, roundish, or polygonal ; the inner larger, 

 extending some distance obliquely downwards on the inner side of 

 the basal cell, and forming the base of the pedicellate perithecial cell 

 which occupies its whole upper face : the smaller outer cell gives rise 

 to the antheridial appendage, which occupies only a portion of its 

 upper face. Antheridial appendage slightly constricted at its base, 

 which is wholly distinct from the pedicellate basal cell of the peri- 

 thecium : subcylindrical, five-septate, each cell above the second giv- 

 ing rise to single (exceptionally two) curved, rather slender tooth-like 

 projections, one terminal, the rest lateral and external, each (except 

 the terminal one) separated by an oblique partition from the cell 

 which bears it. Spores of the usual type, sometimes appearing more 

 than once-septate, the smaller segment sometimes vacuolate and spheri- 

 cally distended at one point: 65 X 6 /x. Perithecium proper (without 

 basal cells) 250-260 x 66 /u, ; longer apical appendages 40-45 fx. 

 Receptacle (proper) 75 x 30 /a. Antheridial appendage 75 X 13 /a. 

 Total length to tip of perithecium 300-400 yu,; average 375 fi. 



On Ghilocoriis bivulnerus. California. 



It is not without some reluctance that this form is separated generi- 

 cally from Stigmatomyces, to which it is most nearly allied, espe- 

 cially through its antheridial appendage, which is very similar to the 

 form occurring in this genus. The genus is based chiefly upon the 

 very peculiar appendiculate perithecium, and the different relative 

 position of its antheridial appendage. Another important point of 

 difference lies in the fact that, while in Stigmatomyces the asci arise 

 by budding upwards from the base of the perithecium, in the present 

 genus the ascogenic area is lateral, the asci budding downwards, out- 

 wards, and upwards from a portion of the wall of the perithecium 

 opposite and below its lowest constriction, on the inner side. In its 

 younger stages the receptacle is triangular, and the perithecium and 

 antheridial appendage bud from its two upper angles obliquely out- 

 wards and upwards, the former on a slender base at first, which 

 ultimately becomes vertical, continuing the main axis of the recepta- 

 cle, while the antheridial appendage becomes sub-lateral in position. 

 The trichogyne is simple and of large diameter. 



