MONOGRAPH OF THE LABOULBENIACE^E. 



293 



the " trichogync " nearly to the base of the inner cell. Perithccia, 80-90 x 22 /x. Receptacle, 

 total length, 75-80 li ; length to tip of perithecium, 110-120 fi. 



On Desmopachria convexa Aubc, Kittery Point, Maine, and New Haven, Connecticut. 



This species differs from those previously described by the apparent absence of the fourth 

 cell in the distal portion of the receptacle. It is related to the preceding species in its cell 

 arrangement, but is easily separated by its greater size, the relative position and shape of the 

 perithecia, etc. The ascogenic cell faces outward, a position which seems exceptional. It is 

 apparently rare, and occurs in small numbers on the anterior legs of its host. 



Chitonomyces aurantiacus Thaxter. Plate XXVI, figs. 6-7. 



Heimatomyces aukantiacus: Proc. Am. Acad. Arts and Sci. Vol. XXIX, p. 103. 



Pale straw-colored, the cell contents including numerous rather bright orange granules or oil 

 globules. Perithecium exceeding the tip of the receptacle by from one-fifth to one-quarter of its 

 length, small, slender, the tip usually curved outward, the lips rather prominent, its external 

 basal cell marked by more or less distinct and very fine transverse ridges. Receptacle slender, 

 the basal cell suffused with brown below, the sub-basal cell small and flat, the two succeeding 

 cells elongate, the outer shorter and continued above by an unusually large basal cell of the peri- 

 thecium : distal portion of the receptacle, as in C. borealis, composed of three cells, the two 

 lower very long and narrow, sub-triangular, obliquely superposed, their lower extremities nearly 

 touching the sub-basal cell. Perithecium, 50 x 14-15 /*. Total length to tip of receptacle, 85- 

 90 yu. ; to tip of perithecium, 100-110 li. Greatest breadth, 22 jx,. 



On Desmopachria convexa Aube, Kittery Point, Maine. 



A rare species occurring on the right elytron near the middle of its distal half. Dis- 

 tinguished from O. borealis, which occurs also very rarely on the same host, and C. Bidessarius, 

 by its slender form and orange color as well as the details of its structure. It is a very delicate 

 species, seldom found in good condition. The striation of the outer basal cell of the perithecium 

 is very characteristic, but not always distinct. 



HYDR^OMYCES nov. gen. Plates XXVI and VIII. 



Receptacle consisting of a basal and terminal portion, the latter united to the perithecium 

 along its inner margin and terminating in a sub-conical, terminally appendiculate free cell, the 

 cell below the sub-terminal cell producing from its left face three outgrowths, which extend 

 upward, and are separated as cells, ending like the terminal cell in a sub-conical body bearing a 

 single terminal appendage and almost completely concealing the face of the sub-terminal cell : 

 the basal portion consisting of three superposed cells, above which three or perhaps four cells 

 form the base of the perithecium. The wall-cells of the latter arranged in four longitudinal 

 series, eacli of which contains more than six (eight) cells. Spores fusiform, once-septate. 



In view of the invariable character of the fundamental cell structure and arrangement in 

 the sixteen species composing the genus Chitonomyces, to which the single form included by the 

 present genus was first referred, and the very distinct variations from this type presented by 



