306 



THAXTER. 



MONOGRAPH OF THE LABOULBEXIACE.E. 



basal coll; the fertile cells usually five in number, the antheridia with short curved divergent necks and 

 produced in pairs, except the terminal one, which is conspicuously spiniferous, the whole series usually 

 obliquely external. Receptacle hyaline, the basal cell mostly larger, longer, tapering below. Spores 

 about 36 X 3.5 /i. Perithelium: venter 90-100 X 36-44 /i; neck 108 X 10-15 fi. Appendage 47-55 fi, 

 the stalk-cell 25-30 \x. Receptacle 65-100 ft. Total length to tip of perithecium 300-325 \i. 



On the abdomen and legs of Scaptomyza graminum Fallen. Kittery Point, Maine; vicinity of Cam- 

 bridge, Mass.; Berkeley, California. On Scaptomyza sp. ?, Caracas, Venezuela. (Blakeslee). 



A very characteristic and common species usually growing in tufts on the upper or lower surface of 

 the abdomen, the specimens from the three somewhat remote regions above indicated not showing any 

 noteworthy regional variations. It is distinguished by its compact tapering appendage, with biscriate 

 antheridia, and the unusually abrupt distinction between the rather slender neck and the distally often 

 very considerably broadened venter of the perithecium. The host is common in New England during 

 the late summer and autumn and may be readily captured by sweeping over flowers like mignonette or 

 clematis or in grassy meadows. The South American specimens do not appear to be essentially different, 

 although somewhat more long and slender, the distal portion of the venter rather abruptly swollen and 

 slightly granular. The spiniferous cell in this species is terminal and becomes an antheridium, fig. 41. 



Stigmatomyces pauperculus Thaxter. Plate XLIX, figs. 18-19. 

 Proc. Am. Acad. Arts and Sei., Vol. XLI, p. 313. July. 1905. 



Short and stout, dark amber-brown, except the hyaline receptacle, and the antheridial portion of 

 the appendage. Venter of perithecium short, stout, inflated; more or less distinctly granular, abruptly 

 distinguished from the neck, which is slightly inflated above the middle, distally curved, and slightly 

 tapering; the apex somewhat asymmetrical and blunt, the lip-cells forming inconspicuous papillae. Re- 

 ceptacle hyaline, rather short, the cells subequal, abruptly distinguished from the parts above. Stalk- 

 cell of the appendage short and prominent, separated from the darker basal cell by an abrupt constriction; 

 the rest of the appendage very broad, short, hyaline, curved inward; consisting of three superposed cells 

 and the terminal antheridium, the total number of antheridia eight (possibly nine), scarcely more than 

 their small necks free. Total length to tip of perithecium 165-175 fi. Venter of perithecium 40-45 X 

 35-38 ii, the neck 50 X 16 /x. Appendage, (including basal cell 16-20 /t), 58-65 X 15 /x. Spores 32 X 3 \i. 



On legs of a small dark fly with white inferior abdomen, Ralum, New Pomerania; Berlin Museum, 

 No. 1291. 



Although based on only three specimens this species seems sufficiently well marked, by its broad 

 fan-like antheridial appendage, to warrant separation from other known forms. It should be remembered, 

 however, that abundant material may show a greater development in luxuriant specimens, both of the 

 receptacle and perithecium. The terminal antheridium is spiniferous. 



Stigmatomyces micrandrtjs Thaxter. Plate XLVII, figs. 19-24. 

 Proc. Am. Acad. Arts and Sci., Vol. XLI, .p. 312. July, 1905. 

 Venter of the perithecium, together w r ith its basal cells and the stalk-cells of the appendage, dark 

 amber-brown, symmetrically oval, or typically subcorneal; at maturity roughened by numerous trans- 

 verse, not very prominent, ridges; the neck usually longer than the venter, slender, nearly cylindrical 

 above its slightly spreading base, and usually more or less distinctly curved; the tip slightly narrower, 

 and subtended by slight elevations, distally asymmetrical, somewhat oblique, the lip-cells prominent, 

 somewhat pointed and divergent, subtending a pointed prominent apex. Basal cells of the perithecium 

 small, subequal, and characteristically prominent. Receptacle typically rather short and stout, the two 

 cells subequal, or the subbasal cell more or less elongate, finally more or less distinctly marked by trans- 

 verse striations. Stalk-cell of the appendage rather short, more or less prominent : the basal cell abruptly 

 narrower, squarish, brown, the rest of the appendage short and stout, hyaline, consisting of two super- 

 posed cells, the lower bearing three antheridia, the upper two, which are surmounted by the single terminal 



