308 



THAXTER. MONOGRAPH OF THE LABOULBENIACE^. 



tacle hyaline, its basal cell more or less elongate, tapering to a narrow base, a rectangular distal thicker- 

 walled portion separated by a thin incomplete septum; the subbasal cell much shorter, more or less 

 abruptly and prominently inflated at its base, sometimes slightly also at its distal end, and having a more 

 or less well defined median constriction, below which the inflated base may be separated by a thin partial 

 septum. Perithecium: venter 54 X 30-40 p; neck 44-55 X 18 p. Appendage 43-50 p, the stalk-cell 

 IS p. Receptacle 70-90 X 22 p. Total length to tip of perithecium 200-300 p (those on the tips of the 

 legs much smaller, 180-200 a). 



On the legs and abdomen of a small fly. Ralum, New Pomerania. Berlin Museum, No. 1294. 



Closely allied to S. Elachipterce and perhaps only a regional variety. The differences in the append- 

 age and in the subbasal cell of the receptacle appear, however, to be constant. The appendage in the 

 present form is unique in possessing but two fertile cells, the lower of which bears three antheridia, the 

 upper two in addition to the terminal one. There arc thus six antheridia in all, while in L. Elachipterce 

 there arc eight, borne on three superposed cells. The spiniferous cell in this species is terminal and 

 becomes an antheridium. 



Stigmatomyces Elachipterce Thaxter. Plate XLVI, figs. 5-10. 

 Proc. Am. Acad. Arts and Sci., Vol. XLI, p. 323. July, 1905. 



Receptacle hyaline, the basal and subbasal cells of nearly equal length, the former more or less dis- 

 tinctly inflated distally in the region of a partial septum, above which it may be somewhat faintly marked 

 by transverse lines; the lower portion having its walls thickened from above downward in a characteris- 

 tically laminate fashion. Stalk-cell of the appendage abruptly distinguished from its much narrower basal 

 cell, which becomes considerably broader distally, a rather large cell being separated from it terminally, 

 bearing three antheridia: above it the appendage consists of two cells, the upper very small, bearing in all 

 normally five antheridia, including the spinose terminal one. Venter of the perithecium pale amber- 

 brown; the wall-cells bulging conspicuously throughout their length, and rather abruptly distinguished 

 above the neck, usually stout and somewhat shorter than the venter; the tip asymmetrical, and slightly 

 oblique, with projecting bluntly pointed apex. Perithecium, venter 55-65 X 30 p, neck 50 X 16-20 p. 

 Appendage 80-90 p, the stalk-cell 15-20 p. Receptacle about 65 X 18 p. Spores 40 X 3.5 p. 



On Elachipiera longula Loew., Intervale, New Hampshire. 



I have had much hesitation in separating this species from S. constrictus to which it is too closely 

 allied. In addition to minor points of difference the subbasal cell is rather inflated than constricted and 

 the antheridial appendage differs constantly as indicated in the accompanying figures, in having three 

 cells above the basal cell bearing eight antheridia, the terminal one spinose. The material of this form 

 is abundant and well developed, and was obtained on the legs of its characteristic host, a small fly captured 

 by sweeping over golden rod. The singular layering of the subbasal cell, its partial separation by an inner 

 ridge opposite the nucleus and the transverse furrows of its upper half (fig. 9) are phenomena evidently 

 similar to those seen in <S. consfricius, and may possibly be connected with a secondary elongation of 

 the basal cell. 



Stigmatomyces proboscideus Thaxter. Plate XLVI, figs. 11-14. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVI, p. 403. March, 1901. 



Venter of the perithecium amber-brown, sometimes more than twice as long as broad, usually but 

 slightly inflated, often more so distally; the neck lighter brown, rather abruptly distinguished, relatively 

 very stout, elongate, nearly isodiametrie, usually curved throughout; the short tip abruptly somewhat 

 narrower, the apex broad and blunt without well developed elevations. Stalk-cell of the appendage 

 brown, relatively small and short, slightly prominent distally; the basal cell broader than long, the five 

 fertile cells above it rather short and stout, the series curved sidewise, the antheridia lateral in pairs. 

 Spores about 30 X 3 p. Perithecium: venter 75-95 X 32-36 p; neck 135-185 X 18-22 p. Appendage 

 55-72, p, stalk-cell 18 p. Receptacle 110-125 X 29 p. Total length to tip of perithecium 400 p. 



On the abdomen of a small fly, Ralum, New Pomerania, Berlin Museum, No. 1288. 



