I ll IXTER. - 



mon()(;ka['Ii ok tiik laboulbeniack/k. 



303 



by a slight constriction, the tip distally quite hyaline; the apex becoming furcate through the presence 

 of an anterior (shorter) and a posterior projection. Stalk-cell of the appendage relatively small, hut 

 slightly prominent below the basal cell, which is nearly as long, sterile, and, as a rule, followed by three 

 cells bearing antheridia singly, the terminal one spiniferous. Receptacle usually straight, the cells Dearly 

 equal or the upper larger. Spores 35 X 3 //. Perkhecium: venter SO- 100 X 45-50 /<; neck SO S3 /i. 

 Appendage 00 fi, the stalk-cell IS p. Receptacle 100-120 /i. Total length to tip of perithecium 200-325 p. 



On all parts of Seatella stagnalis Fallen; Berkeley, California; Intervale, New Hampshire; Kittery 

 Point, Maine, and vicinity of Cambridge, Mass., September. 



Fully developed individuals with the typical structure are uncommon, a majority of the numerous 

 specimens examined having the color dull or paler purplish, the ridges less well defined, without lobula- 

 tions and with less than a half twist; the neck and apex hardly, if at all, modified. The same host is 

 infested by an amber-brown form which may prove a mere variety of that above described, being scarcely 

 distinguishable structurally from the less well-marked individuals of this species, the type form of which is, 

 from its remarkable color and from the structure of its perithecium, one of the most peculiar members 

 of the genus. It is most nearly allied to S. Hydrellicc, the appendages in these two species being nearly 

 identical, L. .spiralis also has certain characters in common with it, as for example its ridged perithe- 

 cium and uniseriate antheridia; but cannot be confused with it. The spinose cell is terminal and becomes 

 an antheridium. The hosts are small flies with brownish wings abundant in moist places, especially 

 about mud holes, and may be captured, by sweeping, in great quantities, especially in late August and 

 September. 



Stigmatomyces IIydhelli.e Thaxter. Plate XLVI, figs. 19-24. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVI, p. 404. March, 1901. 



Venter of the perithecium amber-brown, oval, the wall-cells becoming separated by well-defined, 

 slightly oblique longitudinal broad ridges, which become broader distally where they end abruptly; the 

 neck pale, well distinguished, its middle third prominently inflated, more so posteriorly, and separated 

 from the usually abruptly bent tip by a constriction; the apex rounded, one of the (lateral?) lip-cells, 

 forming a slender, bluntly pointed, well-defined free projection. Stalk-cell of the appendage sub-triangu- 

 lar, somewhat prominent below the basal cell, which nearly equals it in length and is sterile; the fertile 

 cells above it nearly equal, bearing rather large, single, antheridia, with stout, straight necks, the series 

 ending in a terminal spiniferous antheridium. Receptacle hyaline, the two cells nearly equal in length, 

 the lower tapering below, the upper broader inflated, its diameter greater than the base of the perithe- 

 cium and stalk-cell combined, so that the latter region appears to be constricted. Spores 2S X 2 p. 

 Perithecium: venter 50-55 X 33-40 /<; neck 40-43 /i. Appendage 50 p, the stalk-cell 18 p. Receptacle 

 55-65 X 20-22 p. Total length to tip of perithecium 150-185 p. 



Occurring in scattered groups on the superior surface of the abdomen, sometimes on the legs, of 

 llijdrcllia sp. Kittery Point, Maine. 



This species is closely allied to S. purpureus, the appendages being identical in the two species. 

 The conformation of the perithecium appears to separate it, however, very distinctly. It seems to be rare 

 in the type locality and has not been seen elsewhere. The host may be captured by sweeping in moist 

 places about ponds. 



Stigmatomyces spiralis Thaxter. Plate XLVI, figs. 25-29. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVI, p. 405. March, 1901. 

 Venter of the perithecium relatively long and slender, flask-shaped, or more often but slightly if at 

 all inflated, the granular wall-cells distinguished by a corresponding number of abrupt, narrow, longi- 

 tudinal prominent ridges, which become minutely roughened, and are spirally twisted so as to describe 

 a full half turn; the neck concolorous, distinguished by the abruptly elevated and abruptly broadened 

 terminations of the longitudinal ridges of the venter, as long as or slightly shorter than the venter, slightly 



