THAXTER. — 



MONOGRAPH OF TH 10 LA BOULBENIACEjE. 



243 



Well-defined black septum from a short two- to three-celled terminal appendage, the subbasal septum 

 of which is also blackened; the subbasal cell of the receptacle producing a subcrecl, short-stalked, rather 

 long and narrow antheridium ; the neck relatively broad, blunl, about as long as the stalk and venter. 

 Total length to tip of antheridium 60 /'.: the antheridium, including stalk, 28-30 X 7-8 p. 



Female individual more or less tinged with purplish-brown, especially the body of the perithecium. 

 Receptacle consisting of usually five cells obliquely superposed, with the exception of the uppermost, 

 successively smaller from below upward, the series more or less strongly curved outward from the male; 

 the subbasal cell bearing a simple differentiated appendage, its basal cell more or less geniculate and 

 separated from the basally inflated, tapering, brown, five- to six-celled distal portion by a blackish con- 

 striction; the cell next above it producing the single perithecium; the next a simple cylindrical slightly 

 tapering appendage with a black subbasal constricted septum; the terminal cell bearing terminally a 

 short, simple, few-celled primary appendage, distinguished by a constricted black basal and a pale sub- 

 basal septum, and laterally a similar appendage distinguished by a subbasal blackish constricted septum. 

 Perithecium rather elongate, subclavate or subfusoid, the stalk not distinguished from the body of the 

 perithecium, and sometimes showing irregular septa; the tip often somewhat abruptly distinguished, 

 blunt, slightly asymmetrical. Spores about 35 X 3.5 p. Perithecia, including stalk, 90-110 X 18-22 p. 

 Longest appendage 80 p. Receptacle 60-70 p. Total length to tip of perithecium 150-185 p. 



On all parts of Forficula twniata Dohrn.; Mus. Comp. Zool., No. 1355; Guatemala. 



A species most nearly related to the other forms on earwigs, but clearly distinguished by numerous 

 points of difference in both sexes. 



Dimeromyces rhizophorus Thaxter. Plate XXVIII, Figs. 6-8. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVI, p. 412. March, 1901. 



Male Individual. Receptacle consisting of a basal cell, which penetrates the host directly without 

 a differentiated foot by means of a simple rhizoid, and of two to three superposed cells above it, each of 

 which usually bears an antheridium, the upper terminated by a short, pointed, slender cell. The an- 

 theridia rather short and stout, with short, stout necks. Receptacle about 50 X 8 p. Appendage 12 X 

 3.5 p. Antheridia 25 X 9 p. 



Female Individual. More or less deeply tinged with amber-brown. Receptacle amber-brown, 

 consisting of six superposed cells, the small basal cell, hardly visible above the integument, penetrates 

 the host directly by means of a very large, abruptly furcate rhizoid, the two cells above it similar, broader 

 than long, bearing each an appendage consisting of a basal cell bent toward the receptacle, darker and 

 narrower distally, and separated by a dark septum from the three-celled terminal portion, which is straight 

 or slightly curved, larger toward the middle, the smaller terminal cell becoming partly disorganized. 

 The next (fourth) cell of the receptacle bears the single perithecium; the distal terminal cell longer and 

 narrower, and terminated by a short, pointed, one- sometimes two-celled primary appendage (similar 

 to that of the male individual), from which it is separated by a constriction; the subterminal cell nar- 

 rower distally, producing on its inner side an appendage similar to those below it, but straight and some- 

 what shorter. Perithecium with a short stout stalk rapidly expanding into the asymmetrically inflated 

 deeper brown venter of the perithecium; the neck very short and abruptly distinguished; the tip relatively 

 large, four-lobed, inflated with two lateral papillate outgrowths, above which the lips form a subcorneal 

 projection. Spores about 25 X 3 p. Perithecium including stalk 70-90 X 20-25 p. Receptacle about 

 45 X 12 p. Primary appendage 12 p; secondary appendages 35-40 p. Penetrating rhizoidal branches 

 150-184 X 10-12 p. Total length to tip of perithecium 90-110 p. 



On the inferior surface of the abdomen of a small fly. Ralum, New Pomerania. Berlin Museum, 

 No. 1295. 



This form is distinguished from all other described species of the genus by the presence of penetrating 

 rhizoids which replace the normal blackened foot. In the female they appear to be regularly once furcate 



