NEW DIMORPHOMYCETEAE. 227 



Dimorphomyces Pachytelis nov. sp. 



Male individual tinged with brownish yellow. Receptacle consisting 

 of three cells, the basal long and narrow, extending up to the base of the 

 lower antheridium, below which it is slightly prominent; nearly twice 

 as long as the subbasal, the distal end of which is much broader than 

 the base of the terminal cell which is much smaller. Appendage erect, 

 curved toward the antheridia, consisting of usually fi\e cells, the three 

 middle ones distinguished by very slight constrictions and somewhat 

 darker septa, the terminal cell long and tapering. Primary antheri- 

 dium arising from the subbasal cell; one, or sometimes two, usually 

 developing later from the terminal cell. Antheridia almost sessile, 

 the venters relatively stout, the necks rather long and clearly distin- 

 guished, nearly straight, but bent outwards at the base. Receptacle 

 65-85 X 18-28 /x, including foot. Appendage, longest, 68 X 6 /i. 

 Antheridia 35-42 X 9.5-11 fx. 



Female individual dull brownish vellow. Basal and subbasal cells 

 of the receptacle, including their extensions, subequal, obliquely asso- 

 ciated, the former reaching nearly to the base of the latter. The 

 secondary portion of the axis consisting of usually two cells obliquely 

 margined below by the extension upward of the basal cell ; the second, 

 outer, giving rise to the usually single secondary appendage externally; 

 the first, inner, bearing the normally single perithecium. Secondary 

 appendage consisting of about a dozen cells, rather stout, rigid, 

 slightly tapering, one to three of its subterminal cells short, small and 

 distinguished by darker septa. Primary appendage consisting of a 

 relatively large slightly tapering basal cell, about twice as long as 

 broad, which bears terminally the short, more slender, abruptly dis- 

 tinguished terminal portion which tapers dis-tally and consists of four 

 or five cells, the three lower slightly longer than broad, the second and 

 third distinguished by darker horizontal septa: while its outer margin 

 is occupied by the bases of usually two lateral branches, less often one, 

 which project upward, di\erging very slightly, and similar in general 

 to the secondary appendage, the cells somewhat less numerous. Peri- 

 thecium straight or curved outwards, becoming yellowish, distally 

 gradually broader, the short blunt tip and apex rather clearly 

 distinguished, 100-185 X 18-34 ju. Longer appendages 100-210 /i: 

 primary appendage 100-140 X 6.5 /i, its basal cell 25 X 13 fx. Re- 

 ceptacle 75-125 X 25-40 ju. 



On the legs of Pachyteles sp.. Verdant Vale, Arima, Trinidad, 

 B. W. I. No. 2821. 



