NEW LABOULBENIALES. 677 



gulshed from depauperate forms of other species on this host, by the 

 terminal twist of its perithecium, and the character of its appendage, 

 which is more hke that of S. curvirostrus; but is somewhat more 

 highly developed, broader, with more cells and antheridia, the latter 

 turned toward the perithecium, the insertion of which is just opposite 

 the base of the ascigerous cavity. The locality mentioned is the 

 only one from which this form has been obtained, although large 

 numbers of the same host have been examined from other sources. 



Stigmatomyces brevicollis nov. sp. 



Short and more or less distinctly curved throughout, rather uni- 

 formly suffused with dull amber-brown, except the paler receptacle 

 and h^'aline apex. Receptacle relatively short and slender, slightly 

 and evenly suffused with dirty yellowish; the basal cell longer and dis- 

 tally somewhat broader than the subbasal cell, often distinctly nar- 

 rower at its base. Stalk-cell of the appendage rather short and 

 broad, its external margin usually straight, slightly prominent below 

 the rather narrow insertion of the appendage. Appendage rather 

 strongly curved, relatively long, slightly exceeding the venter, the 

 basal cell twice as long as broad, the antheridia turned sidewise, 

 large, prominent; the lower markedly divergent, with straight promi- 

 nent necks ; two arising from the basal and from the subbasal cells and 

 one from the third; the series ending in a single terminal member. 

 Stalk-cell of the perithecium distinctly larger than the cells above, the 

 general region short and hardly broader than the distal end of the sub- 

 basal cell. Venter of the perithecium relatively long, hardly inflated; 

 its diameter nearly the same throughout, longer than the distal por- 

 tion; the neck short and relatively very broad, sometimes hardly 

 distinguished, sometimes subtended by a slight prominence of the 

 venter wall-cells: the tip and apex diverging inward somewhat 

 abruptly, so as to form an externa,l rounded hunch-like elevation, but 

 not otherwise distinguished ; shorter than the neck, truncate-conical : 

 the apex hyaline but not otherwise distinguished ; the lips not at all, 

 or but very slightly, prominent. The wall-cells of the venter neck 

 and tip forming a continuous spiral twist of less than one turn, which 

 is often clearly defined, but is not accentuated by any ridge or furrow. 

 Spores 35 X 3.5 /x. Perithecia 85-95 fx; venter 55-64 X 28-34 ^t; the 

 neck X 18 fi. Appendage 50-52 X 8 ju- Receptacle 42-54 X 14- 

 16 /x. Total length to tip of perithecium 140-170 fj,. 



On the head, thorax and legs of species of Psilopa. No. 1858 (Type) 



