10 THAXTER. 



ilytheomyces Panamensis nov. sp. 



Basal cell of the receptacle not distinguishable from the foot, sub- 

 basal cell small, hyaline, developing a relatively large hyaline out- 

 growth equaling it in diameter, projecting obliquely outward from its 

 left side, of variable form and length and of somewhat irregular out- 

 line, slightly tapering, or usually very blunt. Appendage strongly 

 divergent, curved outward, its axis blackened; its liase in contact 

 with the basal and subbasal cells of the receptacle, and with the stalk- 

 cell of the perithecium: its basal cell slightly larger than the subbasal; 

 the two somewhat obliquely separated, distinguished by a slight in- 

 dentation on either side: the androphorous cell small, hyaline, and 

 clearly distinguished, obliquely separated from the subbasal cell, and 

 occupying half its inner margin; bearing a pair of large, brown, stout, 

 nearly straight antheridia; the rest of the axis comprising two to 

 three cells, which produce branches above and below; the latter pale 

 brown, stout, or even vesicular, curved upward, their basal lower 

 margins nearly opaque; the upper branches much more slender, 

 tapering, and hyaline or but slightly suffused at the base, the lowest 

 one branched above the basal c^ll. Stalk-cell of the perithecium 

 relatively small and irregular, its upper half intruded between two of 

 the cells above it; which are thick walled, somewhat vertically elon- 

 gated, subsimilar; the base of the secondary stalk-cell prominent 

 externally; the margin of the outer basal cell convex; the whole 

 region hyaline, somewhat irregular, and slightly broader than the 

 base of the venter: body of the perithecium pale brown, somewhat 

 darker on the inner side, the regions not distinguished, the wall-cells 

 with a more or less distinct twist of perhaps one quarter of a turn; 

 its venter in general very slightly inflated, but conspicuously so on 

 the right side; its distal half but slightly narrower, the inner margin 

 curving abruptly to the nearly horizontal hyaline lip-region, which is 

 partly hidden by the base of a well developed trigger-appendage, the 

 broad black angular base of which, subtended by a more or less per- 

 ceptible elevation, contrasts strongly with the paler cells about it, 

 extending upward with but slight divergence, thence bending slightly 

 inward for a short distance, and thence abruptly outward almost at 

 right angles; this much longer portion of the appendage paler brown 

 above, darker below, subhorizontal in position, its outline often 

 irregular or wavy, its tip often slightly bent upward. Spores 28 X 

 2.5 fx. Perithecia 36-40 X 14 n, basal cell region 12-13.5 X 12 m. its 



