184 PROCEEDINGS OP THE AMERICAN ACADEMY 



DlCHOMTCES FDRCIFERUS, UOV. Sp. 



Receptacle consisting of a small basal cell, which is nearly hyaline 

 distally and suffused with brown basally, the receptacle above gradu- 

 ally expanding into a more or less fan-like form, the basal portion 

 wholly black and opaque, the opacity extending upwards externally 

 and including a prong-like projection which extends above the base 

 of the perithecium and terminates the sub-distal row of cells on either 

 side ; the latter, seven in number, becoming generally suffused with 

 blackish brown, the long rectangular central cell usually more or less 

 distinct, the remainder partly or wholly opaque and indistinguish- 

 able : the antheridia lighter brownish. The distal row of cells seven 

 in number, their septa straight, thin, and clearly defined ; the middle 

 cell of the series bearing distally two appendages, placed antero- 

 posteriorly, the terminal cells of the series on either side also bearing 

 two appendages, the inner slightly anterior. Perithecia bent slightly 

 forward, tapering very slightly to the blunt apex, which bears a short 

 recurved tooth-like projection on either side. The perithecia and dis- 

 tal row of cells faintly purplish. Appendages short, simple, hyaline, 

 cylindrical, with a constricted blackish base. Perithecia 63 X 16- 

 18/*. Receptacle: length to base of perithecia about 90 /.i ; to tips 

 of external projections 100-120 fi; greatest width 55-60 p. 



On abdomen of Philunthus debilis Grav., Massachusetts. 



A most singular plant looking like a two-pronged fork between the 

 black arms of which arises the pair of perithecia. The lower portion of 

 the receptacle is so opaque that the cell structure is indistinguishable. 



Peyritschiella nigrescens, nov. sp. 



Receptacle consisting of a single basal nearly hyaline cell, followed 

 by three elongate sub-basal cells ; the two outer suffused with black- 

 ish brown, externally opaque: above these follow two successive more 

 or less irregular transverse rows of cells, the lower terminated on one 

 side by a slight prominence close beside the sharp brownish projection 

 (antheridium) characteristic of the genus, a single appendage also aris- 

 ing near the base of this projection. The upper distal row of cells, 

 five in number, ending on one side in a small cell which bears a single 

 appendage above the antheridium, while at the other end the series 

 is terminated by a large cell forming a broad prominence indis- 

 tinctly divided into about five small cells and bearing a group of four 

 appendages. Appendages short, hyaline, cylindrical. Perithecia 65 

 X 19 /m. Receptacle 70 X 37 fi. Total length 130 p. 



