NEW DIMORPHOMYCETEAE. 235 



hardly tapering. Perithecia usually not more than one to two or 

 three in all, the stalk rather slender and well developed, rather clearly 

 distinguished from the ascigerous portion; which is somewhat asym- 

 metrical, slightly more convex on one side, the rather broad apex 

 with one or both margins concave, subsymmetrical, or oblique when 

 viewed sidewise. Perithecia 95 X 15-16 m; ascigerous part 47-52 X 

 16 jx. The divergent axes 85-95 X 6 /x. 



On the left elytron of a small Tenebrionid. No. 3005, Florida, Solo- 

 mon Islands (Mann). 



I have hesitated to describe this very peculiar species owing to the 

 scanty material, which is not in perfect condition, consisting of four 

 males and five females, only two of which have mature perithecia. 

 Its characters are so well marked, however, owing to the Y-shaped 

 habit of the male and the T-shaped habit of the female, that it will 

 probabh- be easily recognized. It is most nearly allied to D. advenfifi- 

 osus, also parasitic on a tenebrionid; but while in the males of the 

 latter species the large secondary axis from the subbasal cell is appar- 

 ently rare, all of the four individuals of the present species are thus 

 developed. The production of adventitious perithecia and antheridia 

 is far more restricted, the largest male examined bearing only six 

 antheridia from both axes, the others less. The female of D. adven- 

 titiosus has differently shaped, short-stalked perithecia, and no one of 

 the several secondary appendages is specially developed as in D. 

 anomalus, although it is only from one or two of the lowest that any 

 formation of adventitious perithecia seems to take place. 



Dimeromyces Peltoidis nov. sp. 



Male individual hyaline, or becoming tinged with brown. Recep- 

 tacle four- or five-celled, the basal larger, sometimes more or less 

 involved by the blackening of the foot ; terminal appendage, two- or 

 three-celled, rarely furcate, undifferentiated and not distinguished 

 from the receptacle. Antheridia slightly divergent, usually two, some 

 times four, rather short and stout, the necks short, blunt, not abruptly 

 distinguished, slightly curved. Total length 40-46 ju. Antheridia 

 15-20 X 4.5-5.5 /x- 



Female individual pale yellovnsh, or becoming tinged with brown. 

 Receptacle short and stout consisting of usually seven cells; the basal 

 rather small, but longer; the rest flattened, subtriangular, in a curved 

 series, each producing one, sometimes two, appendages or perithecia; 



