666 THAXTER. 



abrupt constriction. Appendage consisting of four cells; the basal 

 hardly broader distally, where it is separated by an almost horizontal 

 septum from the subbasal cell, without antheridia; subbasal cell 

 somewhat smaller than the cell above, both bearing distally and 

 externally! t two antheridia which diverge irregularly laterally; the 

 fourth cell bearing one antheridium which is followed by two others, 

 superposed, bent inward, and terminating the appendage; the an- 

 theridia stout, rounded, closely appressed, so that the outline of the 

 appendage is more or less even, without distinctly projecting necks, 

 the spinous process from the terminal antheridium apparently not 

 persistent; the antheridia and all the cells of the appendage per- 

 sistent and rather thick-walled. Stalk-cell of the perithecium very 

 large, somewhat broader than the subbasal cell, more than twice as 

 long as the secondary stalk-cell ; which is subtriangular in outline, and 

 obliquely separated from it distally and externally; the basal cells 

 triangular in outline, but slightly smaller than the secondary stalk- 

 cell: venter nearly symmetrically long-elliptical, or narrower distally; 

 the wall-cells becoming twisted in a spiral of two strong curves 

 which may make somewhat more than half a turn, the edges forming 

 broad wing-like elevations from base to apex; the somewhat spreading 

 base of the neck clearly, but not abruptly distinguished; the neck 

 distinctly shorter than the venter, its diameter nearly uniform above 

 the base; the tip subtended by a slight and abrupt constriction, 

 abruptly inflated, short, subsymmetrical ; the apex of about the same 

 length, truncate conical, or distally very slightly oblique when viewed 

 sidewise; the lip-cells paired, two lower and two higher, but hardly 

 projecting, the lips not at all distinguished or prominent. Spores 

 27 X 3.6 M- Perithecia; stalk-cell 35-60 X 25-30 m, the stalk-cell and 

 basal cell region about 60-70 X 35^: venter 75-100 X 50-55 m; neck 

 45-00 X 18-20 /x; tip 15 X 18-20 m; apex 14-16 m- Appendage 50- 

 55 X 12.5 m; its basal cell 12-14 X 7.5 m; its stalk-cell 35-76 X 7.5 m. 

 Receptacle 80-150 X 20 m- Total length to tip of perithecium 300- 



400 m. 



On various parts of Ensina spp. Mandeville, Jamaica, Nos. 1711, 

 1712. 



This form, although it has been examined in considerable numbers, 

 appears to be subject to the attack of a species of Cladosporium which 

 destroys it. It is well distinguished by its peculiar appendage, the 

 spiral, winged wall-cells of its venter, the large perithecial stalk-cell, 

 the usually abruptly broader base of the subbasal cell of the receptacle, 

 and the long and very narrow stalk-cell of the appendage. 



