292 



MONOGKAPH OF THE LABOULBENIACEiE. 



outer margin become abruptly tbickened below tbe tip. The oblique ridges, which are often 

 very distinct below the apex on the inner side, and the abrupt outward curvature of the latter at 

 maturity serve also to separate it from other known species. It is rather rare and detected with 

 some difficulty. 



Chitonomyces simplex Thaxter. Plate XXVI, figs. 1-3. 



Heimatomyces simplex : Proc. Am. Acad. Arts and Sci. Vol. XXVII, p. 30. 



Pale yellowish or faintly brownish. Perithecium rather slender, continuing the strong curve 

 of the receptacle evenly outward to its rather coarse blunt straight tip. Basal cell of the recep- 

 tacle much longer than the flattened sub-basal cell : terminal cell bell-shaped, small, the whole 

 distal portion of the receptacle evenly curved parallel to the perithecium. Spores, 26 x 11 fi. 

 Perithecia, 55-60 x 11-12 p. Length of receptacle, 75 Basal cell, 15 x 7.5 fi. Total length, 

 90-100 ii. 



On Laccophilus maculosus Germ., Hydroporus spurius Lee, Connecticut. 



A common species, occurring in considerable numbers on the elytra of the host, near the 

 middle of the distal portion, possessing the simple typical structure of the genus, and dis- 

 tinguished by its evenly curved habit, and the prominent blunt almost cylindrical terminal por- 

 tion of the perithecium. 



Chitonomyces Bidessarius Thaxter. Plate XXVI, figs. 4-5. 



Heimatomyces Bidessarius : Proc. Am. Acad. Arts and Sci. Vol. XXVIII, p. 185. 



Hyaline, becoming faintly tinged with blackish. Perithecium small, stout, its upper third or 

 fifth free from the receptacle, the apex bent outward, the basal portion straight, the tip broad, 

 with large, prominent lips. Receptacle stout, the two basal cells more nearly equal, the two cells 

 above these longer than broad and nearly equal ; distal portion nearly as in C. borealis, the base 

 of the short terminal cell horizontal. Perithecia, 40-48 x 15 \i. Receptacle, 65 fi long. Total 

 length to tip of perithecium, 80 fi. 



On Bidessus granarius Aube, Kittery Point, Maine. 



This is among the smallest of all the Laboulbeniaceas, and though presenting no great pecu- 

 liarities, is distinguished by its stout form as well as the short and very broad but not abruptly 

 distinguished tip. It occurs in various positions on the upper surface of the elytra of its 

 minute host. 



Chitonomyces borealis Thaxter. Plate XXVI, figs. 8-9. 



Heimatomyces borealis : Proc. Am. Acad. Arts and Sci. Vol. XXVIII, p. 185. 



Hyaline or slightly yellowish. Perithecium large and stout, its distal half or more free from 

 the receptacle, tapering slightly to the large blunt apex. Sub-basal cell of the receptacle small 

 > and flattened : the distal portion of the receptacle composed of only three cells (the fourth obso- 

 lete or very minute), the distal one large, longer than broad, its base very oblique, the two others 

 very long and sub-triangular, the septum between them running obliquely from the insertion of 



