NEW LABOULBENIALES. 215 



broad distally, about as long as the primary appendage; basal cell 

 region broad, the cells flattened; peritheeiuni subsyininetrical, pale 

 yellowish, the lower halt" considerably inflated; tlie distal tapering; 

 the tip distinguished by a slight depression; the apex blunt, with 

 very minute projections on either side. Antheridia brown, chirk 

 blackish olivaceous externally, the margins nearly opaque below and 

 almost meeting between- the basal and subbasal cells; compact, 

 broad, the margins and termination rather strongly convex; the two 

 terminal appendages shorter than the antheridia, erect, broader above; 

 their close set, narrow insertions, dark blackish olive, the terminations 

 usually hyaline. Peritheeiuni 50-60 X 20-22 n, the stalk-cell IS- 

 25 X 10 n, cHstally. Antheridium 35 X IG jj., its appendages, longest, 

 32 X 5 M- Total length 95-108 /i, greatest width 40-50 m- 



On the abdomen of Athcta (Acrotona) Fungi. Graoh. (fide Dr. 

 Fenyes), No. 219G, and on the abdomen and legs of somewhat larger 

 form, No. 2197, Aukland, New Zealand. 



This species is very closely allied to M. nigrcsccns which it resembles 

 in general form and coloration. It seems to be clearly distinguished 

 by the form of its antheridia, which lack the peculiar wedge-shaped 

 outline of this species, the termination being convex instead of flat 

 or concave. The perithecia are somewhat shorter and stouter, the 

 antheridial appendages shorter, as is the stalk-cell of the peritheeiuni. 

 The broad brown basal cell of the primary appendage, which replaces 

 the narrow black insertion of the appendage in M. nigrescens, is also 

 quite different. 



Eudimeromyces nov. gen. 



Male indhichiaJ, consisting of three superposed cells terminated by 

 a single simple antheridium. 



Female indimdual. General structure as in Dimeromyces, a basal 

 cell followed by a small number of receptacle-cells, which pass without 

 abrupt differentiation into a filamentous sterile appendage. Peri- 

 theeiuni single in the type, arising from one of the lower cells, the walls 

 of its basal and stalk-cells becoming entirely obliterated. 



Were the antheridia of this type compound, its reference to Dimero- 

 myces would hardly be doubtful, owing to the characters of the female 

 which conform in general to this generic type, although there are no 

 secondary sterile appendages, and the primary appendage is not 

 dift'erentiated from the receptacle, as is usually the case in Dimero- 

 myces. In the male, however, the antheridium is terminal, not 

 lateral, and is definitely simple and solitary. 



