406 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Stigmatomyces Limosinae nov. sp. 



Perithecium amber brown, the venter slightly inflated, the neck not 

 abruptly distinguished, tapering slightly ; the tip usually abruptly nar- 

 rower, the posterior lip-cells forming an inconspicuous irregular truncate 

 or rounded bilobed projection somewhat more prominent than a similar 

 projection formed by the anterior lip-cells ; basal cells relatively very 

 large, forming a short, well-defined stalk, hyaline or colored above, often 

 carrying the base of the perithecium beyond the tip of the appendage, 

 and consisting of an inner cell next the appendage and two superposed 

 outer ones, the lower of which (secondary stalk-cell) is smaller ; the stalk- 

 cell below these wholly united to the stalk-cell of the appendage, rather 

 stout and short, separated from the cells above it by a horizontal septum, 

 which may be slightly oblique or (as in the California variety) strongly 

 oblique, in which case the secondary stalk-cell extends downward beside 

 the stalk-cell so that only the lower third or quarter of the latter is free 

 externally. Stalk-cell of the appendage relatively large, as long as or 

 often longer than that of the perithecium and about half as broad, usually 

 bulging externally, its outer margin usually curved symmetrically from its 

 base to the base of the basal cell ; the latter relatively small, deep amber 

 brown, half as long as broad, pointed distally between the antheridium 

 which arises from its inner side and the base of the first fertile cell above it, 

 which, with the other fertile cells, are large and prominent, thick walled, 

 much flattened, and obliquely superposed, distinguished by rather deep 

 constrictions, seven to ten in all, or rarely more (seven to fourteen in the 

 Californian form), the original number being increased by the terminal 

 proliferation of the appendage ; the antheridia borne on the inner side of 

 the appendage, their very long but not abruptly differentiated necks ex- 

 tending obliquely upward, appressed in a double series ; the upper anthe- 

 ridia often infertile, becoming septate and irregularly swollen. Receptacle 

 relatively short, the two cells nearly equal. Spores 28 X 3 /a. Peri- 

 thecium : venter 50-90 X 40-54 /a; neck 90-125 X 15-18^ ; stalk (basal 

 cells only) 72-100 X 25-35 (i. Appendage 60-100 /x, stalk-cell 30-45 ^. 

 Receptacle 70-75 X 22 fi. Total length to tip of perithecium 250-360 /x. 

 Specimens on legs often much smaller. 



On Limosina fontinalis Fallen. Kittery Point, Maine, vicinity of 

 Cambridge, Mass., Berkeley, California. Usually in a dense tuft on the 

 side or near the tip (inferior) of the abdomen and near the base of the 

 posterior pair of legs. The Californian material, from two specimens of 

 the host, differs constantly from the abundant New England material as 



