284 



MONOGRAPH OF THE LABOULBENIACE^E. 



Dichomyces infectus Thaxter. Plate VI, figs. 35-36. 



Proc. Am. Acad. Arts and Sci. Vol. XXIX, p. 102. 



Receptacle consisting of a short basal cell succeeded by an axile cell placed vertically, on 

 either side of which a series of three obliquely superposed cells forms a blackened border. The 

 remainder of the receptacle consists of two successive transverse symmetrical rows of cells, the 

 lower row made up of three central and several smaller external cells, terminating on either 

 side in a short, blunt projection below the prominent antheridia ; beside which arise externally 

 single sterile appendages. The distal row is composed of seven cells, the external cells on 

 either side not extending beyond the bases of the perithecia and destitute of appendages ; two 

 appendages arise between the perithecia, one on either side. Perithecia two, closely approxi- 

 mated, arising from single broad, flattened cells, short and stout, tapering slightly toward the 

 sub-truncate apex, which is destitute of papilla? or appendages. Perithecia, 66 x 22 p. Recep- 

 tacle, 60 x 40 fM. 



On Xantholinus obsidianus Melsh. Waverly, Mass. 



Two specimens of this small form were found at the tip of the abdomen of its host, only one 

 of which is preserved as the unique type of this well-marked species. Its broad, stout perithecia, 

 and the absence of any external appendages on the distal series of cells, distinguish it readily 

 from other species. Although sought for diligently, it has been found but once, notwithstanding 

 the fact that its host is a beetle common in cultivated fields, where it may be found running over 

 freshly turned soil or concealed in decaying vegetable matter. 



Dichomyces princeps Thaxter. Plate VIII, figs. 11-14 ; Plate II, fig. 11. 



Proc. Am. Acad. Arts and Sci. Vol. XXX, p. 479. 



Nearly hyaline, becoming slightly and uniformly tinged with pale reddish brown, sometimes 

 narrowly edged with blackish near the base. Receptacle large, consisting of a single small 

 squarish basal cell, above which are three successive transverse rows of cells placed side by side, 

 the upper margin of each series convex ; the lower series consisting of a long narrow axial cell, 

 with three or four more or less obliquely superposed cells on either side ; the middle series 

 consisting also of an axial cell, with five to eight cells on either side, which extend obliquely 

 upward and outward to form a free rounded projection, each cell of which bears a short append- 

 age, the antheridia prominent at the base of each projection; the third or distal transverse 

 series like the second, the cells often slightly more numerous, forming projections in a similar 

 fashion on either side which bear the same short appendages. The axial cell of the terminal 

 series is followed by two small cells, each bearing a short appendage, on either side of which a 

 large somewhat flattened cell forms the base of the perithecium. Perithecia two, more or less 

 divergent, elongate, slightly inflated and tapering rather gradually to the blunt apex. Perithecia, 

 110-165 x 22-30 ix. Spores, 38 x 4 Receptacle, 150-180 x 70-75 



On Philonthus sordidus Grav. Waverly, Mass. 



This fine species is by far the largest and most conspicuous member of the genus, and, 

 owing to the absence of any deeply blackened portions, illustrates the typical form more clearly 



