NEW DIMORPHOMYCETEAE. 269 



Dimeromyces Platycilibis nov. sp. 



Male indii'iduaJ pale yellowish tinged with brown. Axis of the 

 receptacle straight, erect, five- or six-celled; the basal longer sub- 

 triangular; the rest somewhat flattened, the middle ones broader: 

 terminal appendage simple, three-celled, the middle cell darker, 

 subspherical, distinguished above and below by blackish septa. 

 Antheridia one to three, strongly divergent, sometimes almost at 

 right angles; stout, with four or more antheridial cells; the necks 

 short, well distinguished, slightly curved outward, stout. Length to 

 tip of appendage 38-48 /x. Antheridia 15-18 X 7.5 ju- 



Female indiridual yellowish, rather strongly tinged with brownish 

 at maturity. Axis of the receptacle nearly straight and erect, fi^'e- 

 to eight-celled; the basal subtriangular, much larger; the rest flattened, 

 the upper somewhat oblique: the terminal primary appendage rela- 

 tively very small, similar to that of the male; the secondary append- 

 ages usually single and subterminal, a second sometimes arising below 

 the usually single perithecium, stout, simple; a basal portion of about 

 six to nine cells slightly longer than broad distinguished from a termi- 

 nal portion by a constriction associated with a deeper brown suffusion; 

 the terminal part unicellular, or several celled; variably elongate, 

 the walls variably thickened and disorganized, tapering somewhat 

 from a broader base. Perithecia somewhat more distinctly brown, 

 rather short and stout, broader below the tip, thence tapering some- 

 what asvmmetricalh' to the broad blunt termination, the stalk short 

 or obsolete. Spores about 20-24 X 2.5 (x. Perithecia 58-68 X 20 /x. 

 Receptacle, less foot, 25-28 /x. Primary appendage 15-28 fx. Second- 

 ary appendages 45-85 X 10-12 ^u, terminal part 45-130 /x. 



On the upper surface of PIcdycilihr sp.. No. 2986, M. C. Z., Wainoni 

 Bay, Solomon Islands (Mann Coll.). 



This species is abundantl\' distinguished by its minute primary 

 appendage, and the differentiation of its secondary appendages, the 

 terminal portion of which may \avy considerably in length, a few 

 short stout forms occurring. 



Dimeromyces Aphanocephali nov. sp. 



Male individual colorless, erect, the receptacle three-celled, the cells 

 subequal, the upper long-oval, tilted and externally prominent. 

 Antheridium erect, the stalk-cell free only externally, the short neck 



