THAXTER. 



MONOCJRAPIT OP THE LABOTJLBENIACR33. 



309 



This species is distinguished by the very long curved nearly isodiametric neck of its perithecium, 

 which is rathei abruptly distinguished from the short broad truncate nearly isodiametric tip. The an- 

 theridia are not numerous and rather crowded on the appendage, the terminal one- spinifcrous. Under 

 a high magnification the venter of the perithecium is seen to he finely transverse-punctate. 



Stigmatomyces Baeri (Knoch) Peyritsch. Plate XLIX, figs. 22 24. 



Since the adult of this species has not as yet been properly figured, I have given two illustrations in 

 the accompanying plates for comparison. The terminal anthcridium appears to have arisen from the 

 terminal cell by proliferation, as the latter bears the spine, where its presence has been determined (fig. 

 22). In older individuals the twist of the wall-cells is even more pronounced than is indicated in fig. 23. 

 The form of the perithecium is somewhat similar to that of S. dubiu.t, which is, however, quite different 

 in possessing an eight-celled appendage, and in other respects. I have not yet seen this species in America, 

 but have no doubt that it occurs here. 



Stigmatomyces Sarcophagi Thaxter. Plate XLIX, figs. 14-17. 

 Proc. Am. Acad. Arts and Sci., Vol. XLI, p. 325. July, 1905. 



Normally long and slender. Color nearly uniform dull amber-brown, except the hyaline receptacle 

 and the appendage above its basal cell. Venter of perithecium minutely transversely granular-striate, 

 rather narrow, straight, the wall-cells prominent and slightly spiral; the neck rather abruptly distinguished, 

 the cells more or less spirally disposed, a rather distinct subterminal enlargement, above which the sub- 

 conical tip ends in a blunt slightly oblique apex, the paired posterior lip-cells slightly prominent; the 

 basal cells small, somewhat prominent; the stalk-cell relatively large. The receptacle normally very 

 elongate, hyaline, nearly isodiametric; the subbasal cell much longer than the basal. The appendage 

 long, slender, recurved; its stalk-cell about two or three times as long as broad; the basal cell more than 

 tw ice as long as broad, the portion above it consisting of five superposed cells, and a terminal antheridium; 

 the total number of antheridia normally nine. Spores about 35 X 4 p. Venter of perithecium 75-90 

 X 35-42 /(, the neck 150 X 18-22 /x. Appendage, to edge of curvature, 110 //, the stalk-cell about 35 //, 

 the basal cell 18-20 p. Receptacle 200-325 X 30 ( «. Total length of larger individuals 600 /<. 



In tufts on the abdomen of Sarcophaga sp., Island of Margarita, Venezuela; Dr. A. F. Blakeslee. 



This large and fine species was obtained in great abundance on a black Sarcophaga collected in 

 large numbers by Dr. Blakeslee by sweeping over a mud hole. I was at first inclined to think it identical 

 with S. Limnophom which is its nearest ally, but the appendages are constantly different and the general 

 characters are sufficiently unlike in the two species, to warrant their separation, although they are undoubt- 

 edly closely allied. The position of the spiniferous cell in the mature appendage has not been observed. 



Stigmatomyces Limnophor.e Thaxter. Plate XLIX, figs. 11-13. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVI, p. 400. March, 1901. 

 Venter of the perithecium relatively small, amber-brown, the wall-cells becoming powdered by a 

 darker maculation and separated by a corresponding number of well-defined unmodified longitudinal 

 ridges which run somewhat obliquely and end, not abruptly, at the base of the neck: the latter generally 

 slender, strongly bent throughout or even recurved, abruptly differentiated, sometimes of less diameter 

 than the tip, which is distinguished from the rest of the neck by an abrupt enlargement more prominent 

 anteriorly; the apex (in the not wholly mature types) unmodified, blunt, slightly oblique. Stalk-cell of 

 the appendage rather prominently rounded externally, but not protruding abruptly below the basal cell, 

 which nearly equals it in length and is slender, slightly larger distally, its base hyaline, its wall, which 

 is dark amber-brown above, becoming gradually thicker, so that the lumen of the cell is attenuated below, 

 distally bearing two antheridia; the fertile cells above it, usually seven in number, forming a series out- 

 wardly recurved, the terminal cell apparently sterile, the two small cells below it bearing each a single 

 antheridium, while the remainder bear two; the antheridia with short, broad, slightly recurved necks. 



