NEW DIMORPHOMYCETEAE. 253 



Dimeryomyces geminandrus nov. sp. 



Male individual hyaline to yellowish, sometimes with a slight brown 

 tinge. Receptacle slender, erect; consisting of from two to six cells: 

 the basal long, the rest somewhat flattened and obliquely superposed; 

 basal cell of primary appendage long, symmetrical, of nearly uniform 

 diameter, separated from the slender usually three-celled free append- 

 age by a broad black constricted septum. Antheridia two to a dozen 

 or more, often adventitious, even from the basal cell of the primary 

 appendage which is usually enclosed by the venters of two paired 

 antheridia which arise symmetrically and subterminally from the 

 terminal cell of the receptacle, the necks curved outward in opposite 

 directions: the rest formed in an often irregular series from the cells 

 below, on the anterior side, sometimes associated with a secondary 

 appendage from the basal cell of which one or more adventitious 

 antheridia may also develop. Antheridia long and slender, the long 

 stalk-cell abruptly erect or but slightly divergent, the neck curved 

 outward. Receptacle, exclusive of foot and basal cell of appendage, 

 40-80 X 8-12 ju. Free primary appendage 40 X 4ju, the basal cell 

 18-20 X 6 M- Total length to tips of highest antheridia 80-l;30 m- 



Female individual ver\- variable in size, usuallv distinctlv vellow or 

 with variable brown suffusions. Receptacle rather short, consisting 

 of from six to eight somewhat flattened obliquely superposed cells, 

 the upper becoming tinged with brown: the subterminal giving rise 

 to the usually single perithecium, below which two to four cells, as 

 well as the terminal one, give rise to secondary appendages; the latter 

 single and simple, or their basal cells producing two to four branches 

 distinguished by very thick black constricted septa, hyaline, slender, 

 flexuous, often very greatly elongated. Basal cell of the primary 

 appendage usually producing one, sometimes more, adventitious 

 branches similar to the other secondary appendages, on the inner side. 

 Perithecium normally single, rarely two or three, ^•ery variable, often 

 of great size, sometimes sessile with a broad base, more often with the 

 stalk-portion much elongated, pale yellowish, distally undistinguished 

 from the purplish brown ascigerous region; the tip usually well dis- 

 tinguished by slight elevations and tapering symmetrically to the 

 clearly defined apex, which, in face view, is more or less broadly spread- 

 ing, symmetrically rounded with submarginal indentations; the side 

 view asymmetrical, compressed, blunt, usually with a slight subter- 

 minal enlargement. Perithecia 150-925 X 20-34/^. Receptacle 70- 

 125 X 20-40 iJL. Longest appendage seen, 715 X 5 ju. 



