668 THAXTER. 



merely granular venter, relatively shorter, stouter neck, and shorter 

 stouter appendage which is less highly developed, having usually but 

 three cells. The wall-cells of the venter are distinctly spiral in the 

 present species, while those of the neck are straight: but in S. Limno- 

 phome the converse is true, the wall-cells of the venter in this species 

 having merely a slight obliquity. 



Stigmatomyces Aciurae nov. sp. 



Form elongate, the receptacle hyaline, the rest more or less tinged 

 with dull amber-brown. Basal cell usually bent and broadly rounded 

 at base, stout, hardly tapering; subbasal cell usually abruptly nar- 

 rower, and separated from the basal by a more or less pronounced 

 enlargement in the region of the septum; usually much elongated and 

 of about the same diameter throughout, sometimes shorter and distally 

 broader. Stalk-cell of the appendage reaching to the subbasal cell, 

 but hardly if at all over-lapping it, relatively short and distally broad, 

 its base blunt; the basal cell of the appendage large, narrow at the 

 base, its margins slightly concave, broader distally, darker, bearing 

 distally on the inner side two antheridia diverging irregularly laterally; 

 the rest of the appendage consisting of two axis-cells, the lower larger, 

 producing two suberect antheridia; the upper smaller producing one 

 antheridium lying beside a single antheridium which terminates the 

 appendage, and is furnished with a large stout spine at the base on its 

 inner or outer side; these four antheridia erect, or but slightly diver- 

 gent, forming a more or less regular terminal crown; the whole 

 appendage somewhat thick-walled, suffused and permanent, except the 

 necks of the antheridia which soon collapse. Stalk and basal cells 

 of the perithecium relatively small, and forming a compact base, 

 distally concave, the outer basal cell rather abruptly prominent below 

 the narrower base of the venter; which is slightly inflated and nearly 

 symmetrical; the margin subdistally concave below the distinctly 

 prominent terminations of its wall-cells, which have a hardly percep- 

 tible twist, and an indistinctly and transversely striate or granular 

 surface: neck abruptly distinguished, stout, longer than the venter, 

 its margins concave, symmetrical, abruptly broader distally; the tip 

 abruptly somewhat narrower, tapering slightly, relatively short; 

 the apex distally oblique, not distinguished, its four cells forming 

 coarse, paired prominences, the anterior higher, which surround the 

 closely united lips; the latter combined to from a projection extending 



