256 



THAXTER. MONOGRAPH OF THE LABOULBENIACEyE. 



about 50°. Spores about 38 X 2.5 /*. Perithecium without appendages 126 X 25 /z; the appendages 

 14 fi. Receptacle 220-350 X 120-165 /*. Total length to tip of perithecium 300-330 /i. Appendages 

 20-80 (i. 



On the abdomen of (?) PhUonthus sp. Ralum, New Pomerania. Berlin Museum, No. 1013. 



A very beautiful and peculiar species, distinguished from all others by its stout tooth-like auricles 

 which make the tip of the perithecium appear bifid. Although scanty, the material is in fine condition, 

 the host having been brought in alcohol by Dr. Dahl. 



Dichomyces Australiensis Thaxter. Plate XXXIII, figs. 10-13. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVII, p. 28. June, 1901. 



Receptacle usually rather long and narrow, the basal cell relatively large, hyaline or slightly suf- 

 fused; the margins of the lower tier usually continuous with those of the middle one, the marginal cells 

 deep blackish brown or quite opaque, the middle cell hyaline or translucent throughout its lower third 

 often punctate: the middle tier consisting of about nine cells, slightly suffused with pale reddish brown 

 externally, more or less edged with deep blackish brown; the terminal cells forming a free rounded pro- 

 jection on either side, extending as high as about the middle of the rather large antheridia, the tips of 

 which may reach to the base of the perithecia: the upper tier nearly hyaline, consisting normally of 

 from eleven to thirteen subequal cells, the terminal ones extending but slightly higher than the bases of 

 the perithecia, which are normally two in number, rather deeply suffused with purplish brown through- 

 out; the apex hyaline, the posterior lip-cells producing each a relatively large bluntly pointed appendage, 

 the two diverging nearly at right angles to the axis of the perithecium, becoming slightly recurved, the 

 distance from tip to tip about twice the diameter of the perithecium. Appendages nearly as long as the 

 perithecia. Perithecium 60-70 X 16-20 ;i, its appendages 18 /i. Receptacle 90-100 X 42-48 [i. Total 

 length to tip of perithecium 160-170 p.. 



On the superior surface of the abdomen of Quedius ruficollis Grav., Sharp Collection, No. 1102. 



A species peculiar for its long recurved auricles which are unlike those of any other species except 

 D. Mcxkanus from which its compact form, dark color, cylindrical auricles, and pointed tip serve readily 

 to distinguish it. 



Dichomyces Mexicanus Thaxter. Plate XXXIII, figs. 14-17. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVII, p. 28. June, 1901. 

 General habit much like that of D. princeps, generally rather long and slender. Basal cell hyaline, 

 the lower tier relatively long and narrow broadly edged externally with black; the median cell hyaline, 

 or only the marginal cells slightly suffused with smoky brown: the middle tier distinguished from the 

 lower by a slight prominence, hyaline, seven to nine-celled; the marginal cells protruding but slightly 

 on either side; the antheridia brownish, short, stout, blunt-pointed: the upper tier relatively very long, 

 sometimes twice as long as the middle tier, consisting of from nine to eleven cells; the marginal cells pro- 

 truding but slightly on either side, very much as in the middle tier. Perithecia normally two, about as 

 long as the distal tier and concolorous with it, or somewhat darker, rather stout, tapering but slightly; 

 the tip rather abruptly distinguished, broadly truncate with a slight median projection; the posterior 

 lip-cells giving rise each to a long horizontal appendage, which becomes recurved, is bluntly pointed and 

 somewhat narrower toward the base, the distance from tip to tip often twice the diameter of the perithe- 

 cium. In a few specimens the receptacle and perithecia are somewhat evenly suffused with smoky brown. 

 Perithecia 75-85 X 25-30 /z, the appendages 18-22 /*. Receptacle 105-200 X 55-70 /z. Total length 

 235-275 /i. 



On the inferior surface of the abdomen of PhUonthus atriceps Sharp. Jalapa, Mexico. Sharp 

 Collection, No. 1112. Specimens, sometimes occur in which the tips of the perithecia are blunt and 

 unmodified, but this condition may have resulted from breakage or be due to immaturity. The species 

 is closely related to D. Australiensis, from which it differs in its more elongate form, somewhat clavate 



