i ll tXTER. — 



MONOGRAPH OF THE LABOULBENIACEiE 



spinose antheridium. Spores 45 X 4 ft. Perithecium, venter 72 SO X . r )() 00 //, the neck 1 10 150 X 

 16 18 ft. AppCBdage iibove stalk-cell 35 10 /(; (lie .stalk-cell 20 //. Receptacle 00 110 X -'50 /'.. Total 

 length to ti|> ol* perithecium 275 .'525 ft. 



On the superior surface of the abdomen of a small blackish fly, Ralum, New Pome ran ia; Berlin 

 Museum, No. 12S4. 



Although in its typical form (fig. 20) this species seems very unlike the typical <S'. rugosus, more slender 

 and elongate specimens occur which have made me hesitate to separate them specifically. The characters, 

 of the antheridium, however, seem constantly different as indicated in the accompanying figures; and 

 while that of S. rugosus possesses five superposed cells above the basal cell (fig. 27), bearing in all twelve 

 antheridia, the present species has but two bearing six antheridia, and in one or two small specimens 

 there seem to be even less. The spinose cell is terminal and becomes an antheridium. 



Stigmatomyces rugosus Thaxter. Hate XLVII, figs. 25-28. 



Proc. Am. Acad. Arts and Sci. t Vol. XXXVI, p. 308. March, 1001. 



Venter of the perithecium dark amber-brown, roughened by about ten transverse more or less irregu- 

 lar and sometimes anastomosing darker ridges formed by irregular wart-like' elevations; evenly oval or 

 elliptical, and abruptly distinguished from the rather stout neck, which is usually bent outward and about 

 equal to it in length or somewhat shorter, distally distinctly enlarged, especially posteriorly; the tip be- 

 yond this enlargement abruptly somewhat narrower, distally asymmetrical, the two posterior lip-cells 

 forming two corresponding projections, rounded or bluntly pointed and more prominent than the bilobed 

 papilla formed below them by the anterior lip-cells the four subtending a slightly prominent apex. Stalk- 

 cell of the appendage small, subtriangular, amber-brown, abruptly prominent below the relatively large 

 dark brown basal cell, which, though narrower, nearly equals it in size, may or may not bear antheridia, 

 and has a well-marked annular thickening on the inner side of its wall at the base; the fertile cells above 

 it, four or five in number, bearing the rather large antheridia in pairs; the series becoming obliquely 

 lateral or external, the free necks strongly curved outward. The cells of the receptacle nearly equal, 

 or the upper larger; the basal cell tapering to the foot and distally slightly broader than the subbasal cell. 

 Spores about 40 X 4 ft. Perithecium: venter 72 X 45 /t; neck 62-72 X 15-18 /i. Appendage proper 

 60-70 /*, stalk-cell 18 /«. Receptacle 90-100 X 20 ft. Total length to tip of perithecium 250-290 ft. 



< to the legs, thorax, and abdomen of a minute fly. Berlin Museum, No. 1296. Ralum, New 

 Pomerania. 



A form (fig. 28) which I am unable to separate satisfactorily from this species, was obtained from a 

 small fly sent me by Dr. Piper from Puyallup, Washington; and I have found a similar one at Kittery 

 Point, Me. The material is not very abundant but the species seems too near S. rugosus for specific 

 separation. The type from Ralum, figs. 25-26, is very nearly allied to S. micrandrus; but differs in the 

 several points referred to under that species. The spinose cell is intercalary, being the fourth above 

 the basal cell of the appendage. 



Stigmatomyces constricttjs Thaxter. Plate XXVI, figs. 1-4. 

 Troc. Am. Acad. Arts and Sci., Vol. XXXVI, p. 401. March, 1001. 



Venter of the perithecium dark amber-brown, subreetangular, or more or less inflated; the short 

 stout neck about equal to it in length, very abruptly distinguished beyond the four rounded elevations 

 which mark the distal ends of the brown wall-cells of the venter, subcorneal, with a considerable sub- 

 median enlargement often more prominent posteriorly; the tip often tapering to the five-papillate apex, 

 the middle posterior papilla blunt and more prominent, the other four nearly symmetrical. Stalk-cell of 

 the appendage often suboblong and externally prominent throughout its length, or only distally; the basal 

 cell narrower and longer, separated from it by a rather deep constriction and bearing three antheridia 

 distally: while above it the single remaining fertile cell is very small, bearing two antheridia and followed 

 directly by the spinose terminal antheridium; all the antheridia relatively large and almost free. Recep- 



