MONOGRAPH OF THE LABOULBENIACE^E. 



269 



HAPLOMYCES. Plate VII, figs. 1-10. 



Proc. Am. Acad. Arts and Sci. Vol. XXVIII, p. 159. 



Receptacle consisting of two small superposed cells from which arise the single perithecium 

 and the single antheridial appendage. Perithecium large, pointed, borne on a single stalk-cell 

 surmounted by three basal cells. Antheridial appendage consisting of a basal cell surmounted 

 by a terminal body, the antheridium, entirely divided by anastomosing septa into numerous small 

 cells, and furnished with a short lateral projection, together with a sub-terminal short spine- 

 like process arising from a rounded base. Asci four-spored, arising from eight ascogenic cells. 

 Spores once septate. 



Owing to the fact that no fresh material of this genus, or any of its younger stages have 

 been examined, there are numerous points connected with it which need to be made clear. 

 Unlike the succeeding genus, Cantharomyces, its nearest ally, the antheridium appears to be ter- 

 minal, not lateral. No discharge of antherozoids was observed in any of the specimens examined, 

 and it is uncertain how and where such discharge takes place. Certainly not through the ter- 

 minal spine-like process, so characteristic in the genus, which is undoubtedly a peculiarly 

 modified sterile cell, perhaps the remains of the original terminal spore segment. It seems 

 more probable that a lateral projection prominent in some specimens (at the right in fig. 3) rep- 

 resents the point of discharge ; but what relation the irregularly honeycomb-like mass of cells 

 composing the body of the antheridium bears to this projection, or how many of these cells are 

 really spermatic, it is impossible to say. Examined with an immersion, indications of a central 

 cavity, containing small roundish bodies, probably antherozoids, and extending upward and out- 

 ward to the external projection previously mentioned, may be made out, though not with suffi- 

 cient definiteness to enable one to figure these structures. From analogy with related genera, 

 however, there can be little doubt that some such arrangement of the spermatic cells about a 

 common cavity must exist. 



The perithecium is remarkable from the fact that it contains eight ascogenic cells arranged 

 symmetrically in four pairs, a condition only occurring in this and, perhaps, in the succeeding 

 genus. 



The hosts of these curious little forms all belong to the staphylinid genus Bledius, common 

 further south along the sandy or gravelly margins of streams, especially in shady places, where 

 they may be found under stones or burrowing in the sand. The only material examined has 

 been that contained in the collection of the Museum of Comparative Zoology at Cambridge. 



Haplomyces californicus Thaxter. Plate V, figs. 1-4. 



Proc. Am. Acad. Arts and Sci. Vol. XXVIII, p. 159. 



Perithecia olive brown, tapering abruptly to the small blunt apex, greatly inflated exter- 

 nally, internally nearly straight ; a distinct prominence, the base of the old trichogyne, usually 

 visible on its anterior face below the apex, its basal cells short, wider than long, more or less 

 suffused with olive brown, the stalk-cell stout, sub-triangular, hyaline. Receptacle small ; its 

 basal cell nearly hyaline, more than twice as large as the sub-basal, which is intensely blackened 



