MONOGRAPH OF THE LABOULBENIACE/E. 



281 



cal papillae. Receptacle stout, sub-triangular in form, consisting of a rather small, often 

 slender, basal cell, followed by the usual three transverse series of cells. The lower of these 

 consists of the median or primary cell, on one side of which a single small cell is cut off, while 

 on the opposite side a series of four or more cells, mostly appendiculate, extend obliquely upward 

 and outward, overlapping one another to some extent. The middle series consists of a large 

 median cell, on either side of which numerous (four or more) appendiculate cells extend obliquely 

 upward .and outward, and produce, on one side, the large pointed antheridium, which does not 

 usually project beyond the margin of the receptacle. The distal scries, like the sub-distal, 

 composed of fewer cells and bearing the single perithecium. Appendages oval or short cylin- 

 drical, becoming brownish; their basal septa large, but not conspicuously blackened. Spores, 

 37-40 x 4 fi. Perithecia, 100 x 33 ft. Appendages (longest), 33 ft. Total length to tip of 

 perithecium, I 90-220 ft. Receptacle, 90-110 x 50-58 ft. 



On Platynus cineticollis Say. Vicinity of New Haven, Conn. ; Weston, Mass. ; York, Maine. 



A rare species occurring near the extremity of the anterior legs of its host, where, owing 

 to its compact form and small size, it is easily overlooked. It is very distinct from the two pre- 

 ceding species, and peculiar from its sub-triangular form, from the presence of cells cut off on 

 both sides of the primary or median cell of the lower transverse series, and from the numerous 

 short, inflated, bladder-like appendages. The latter are thickly clustered on the left margin of the 

 receptacle, while the right presents an unbroken line from the foot nearly to its summit. The 

 habitat of the host has been already mentioned under P. curvata, and both species have been 

 found on a single individual. 



Peyritschiella nigrescens Thaxter. Plate VI, figs. 22, 23. 



Proc. Am. Acad. Arts and Sci. Vol. XXVIII, p. 184. 



Receptacle sub-triangular in form, consisting of a single basal nearly hyaline cell followed 

 by the usual three series, the lower broadly edged with black on either side, consisting of a long 

 median cell from which three cells are cut off on the right and two on the left ; the middle 

 series of about ten cells, which form slight blunt appendiculate projections on either side, 

 extending much higher on the left than at the right, where the single antheridium is situated ; 

 the upper series shorter than the middle, bearing the single stout, asymmetrical perithecium, on 

 either side of which are several short appendages asymmetrically placed. Perithecia, 65 x 19 ft. 

 Receptacle, 70 x 37 ft. Total length, 130 ft. 



On Philonthus debilis Grav. Waverly, Mass. 



The single type from which the above description is drawn was found on one of the posterior 

 legs of its host, the figures given representing an anterior and posterior view of the same speci- 

 men. The compact sub-triangular form of the receptacle and the stout perithecium connect it 

 more closely with P. minima than with either of the other species ; while the external blackening 

 of its lower cell series suggests some of the species of Dichomyces. In its asymmetrical 

 development and single antheridium, however, it corresponds exactly to the type structure of 

 Peyritschiella. The perithecium of the unique type is not quite mature, and more fully 

 developed material may show that its apex becomes characteristically papillate as in the other 

 species. 



