XEW DI.MORPHOMYCETEAE. 245 



against it; the basal cell longer, the following six or more squarish, 

 the subdistal ones broader, the lowest tinged with brown. Perithe- 

 cium becoming tinged with brown, straight, erect, rather stout, 

 sessile, subsymmetrical; the tip- and apex-regions abruptly dis- 

 tinguished, tapering to a rather broad bluntly rounded termination. 

 Perithecia 90-100 X 24-30 m- Receptacle 60-65 X 20 m- Longest 

 appendages 75-100 jx. Total length to tip of perithecium 140-160 /x- 



On the elytra of Leiochrodes mcdianiis Westw. and Leiochrodcs sp. 

 NO..2950, 2951, 2996 and 2997, Auki, Solomon Is. (Mann Coll.). 



In the group of forms occurring on species of Leiochrodcs this species 

 is easily distinguished by its very different color, sessile perithecium 

 of a different form and lying between the two erect appendages 

 which are usually in close contact with it and appear to hold it as in a 

 socket. The male differs from that of the others in its long slender 

 form, incurved necks and pale yellowish color. It occurs scattered 

 over the elytra, sometimes in company with D. rugosus. 



Dimeromyces rugosus nov. sp. 



Male individual rather dark brown. Receptacle four-celled, the 

 cells irregular, somewhat obliquely superposed, the basal longer. 

 Appendage erect, three to four-celled, the basal much larger and 

 broader. Antheridia one or rarely two, the stalk-cell well developed, 

 often longer than broad, the venter rather stout, erect beside the 

 appendage, the neck curved abruptly sidewise, or even recur\ed. 

 Total length 75-92 X 17-21 /;• Antheridia 42-50 X 11-12.5 m- Ap- 

 pendage 40 /x. 



Fenude individual becoming rather dark brown, or partly opaque. 

 Receptacle relatively small, four-celled, the cells obliquely superposed, 

 the basal somewhat longer; the two others flattened and subequal; 

 the subbasal producing the single secondary appendage; which is 

 stout, five to nine-celled, distally usually somewhat broader, the third 

 and fourth cells usually broader than long, the basal long and nar- 

 rower: the third and sometimes the fourth cells producing perithecia; 

 the primary appendage shorter than the secondary, which may reach 

 to the middle of the perithecium, consisting of usually four cells, the 

 second and third shorter and becoming darker brown. Perithecium 

 relatively large, becoming nearly opaque above the hyaline base, 

 long, straight, subsymmetrical, rather slender, becoming ^•ery dark 

 and finely transversely rugose, the tip well distinguished, relatively 



