\:)i\ PROCEEDTN THE AMERICAN ACADEMY. 



No. 698, [razu, Costa Rica; on Gynandropw Mexicantu Putz., British 

 Museum (Biologia Coll.), No. 682, Cordova, Mexico. I sually on l< s 



Rhachomyces Thalpii aoy. Bp. 



P< rithecium hyaline or Btraw colored, becoming faintly tinged with 

 brown, slender, inflated oear the base; the distal half or less mostly 

 curved awaj from the appendages, tapering gradually to the blunt 

 uudifferentiated apex. Receptacle normally consisting "I eleven • 

 superposed to form the main axis, hyaline, their septa horizontal or but 

 Blightly oblique, the basal cell subtriangular, tinged with reddish In-own ; 

 the cells of the secondary series hyaline and proportionately rather large. 

 Appendages rather dense, almost opaque except the marly or quite 

 hyaline tip and inner margin ; rather short, about four to six of those 

 about the base of the perithecium much larger, longer, and Btouter, reach- 

 ing somewhat higher than the middle of the perithecium, their tips at 

 first clavate becoming obliquely truncate or fan shaped through the 

 degeneration of the hyaline portion, the curved tips of the antheridia 

 projecting rather conspicuously. Perithecia 115X30/*. Total length 

 of receptacle 140/a. Longer appendages 90/*. 



On Thalpius rufulus Lee, Amer. Mus. of Nat. History. Texas. 



Rhachomyces Zuphii nor. pp. 



Perithecium relatively small, straw colored, somewhat inflated at the 

 base, the tip rather abruptly distinguished and slightly inflated. Axis 

 of the receptacle Blender, consisting normally of about sixteen cells which 

 are nearly hyaline, or with brown shades below the Bepta. Append] 

 nearly opaque, straight stout appressed, not elongate, more or I 

 swollen distally along the inner margin of the Bubhyaline tip; eight to 

 ten about the base of the perithecium longer and stouter. Perithi 

 110-140 X 25 p. Longer appendages about 110-140/a. Total length 

 to tip of perithecium 350- 100 /». 



On Zuphium Mexicanum ('hand.. British Museum (Biologia ColL), 

 No. 713. Cordova. .Mexico. 



Rhachomyces Canadensis nov. Bp. 



Perithecium pale 8 traw colored, nearly straight, a median and Bubter- 



minal well-defined broadly-rounded ridge marking the transverse Bepta 



between the three lower tiers of wall-cells; the tip tapering rather 



abruptly, hyaline, the apex rounded. Receptacle rather sleuder, the 



