THAXTER. — RICKIA AND TRENOMYCES. 379 



14-16 X 6-S /i. Total length to tip perithecium 50-70 X 24-32 n. 

 Basal and subtcmlin^^ cell of primary appendage 12-15 X 5 /i. 



On Euzcrcon spp. Trinidad, Nos. 2432 and 2430; Kamerun, No. 

 2443. 



This species is most nearly related to R. Mcgisthani from which it 

 differs in its more complicated receptacle, larger size and more or less 

 evenly spathulatc outline. In this, as well as in the following species 

 (R. Mcgisthani) the lowest appendage on the anterior side is subtended 

 by a cell which lies external and inferior in relation to the lowest cell 

 of this series, instead of distal, and has the appearance often of having 

 been separated, not from this cell, but from the basal cell of the re- 

 ceptacle below and it is possible that this is its actual relation. 



Rickia Megisthani nov. sp. 



Hyaline. Basal cell rather short and stout, obliquely separated 

 from the basal cell of the anterior series, which is angular, subiso- 

 diametric and lies immediately below the base of the perithecium, 

 cutting off an appendiculate cell which sometimes covers its whole 

 outer margin, or more often lies external and inferior in relation to it; 

 the series consisting of two other cells which are subequal, elongate; 

 the base of the upper lying obliquely over the distal end of the lower, 

 which may or may not cut off an appendiculate cell distally; the cell 

 above it, sometimes lacking, with or without an appendiculate cell 

 which lies in contact with the outer margin of the perithecium reach- 

 ing to its upper third or half: the posterior series consisting of 

 normally four cells, the lowest more often not appendiculate; the 

 second and third equal and appendiculate; the fourth vertically 

 elongated, its upper third or half quite free, straight or distally 

 slightly geniculate and continued by the long free finger-like slightly 

 curved basal cell of the primary appendage. Median series of three 

 subequal cells, vertically placed and extending almost to the apex of 

 the perithecium. Perithecium rather stout, its inner margin straight, 

 its outer convex and one half to one third free; the tip very slightly 

 bent inward; the outer lip-cell forming a small, short, finger-like 

 projection. Appendages very short and small, 5 X 2.5 jjl. Spores 

 20X2fjL. Perithecia 30-32 X 8-117 /x- Basal cell, including foot, 

 16 X 7 M. Total length to tip of perithecium 50-60 X 20-30 /x. The 

 free termination of the posterior series, including basal and subtend- 

 ing cell of primary appendage 25-40 X 5 /x- 



On Megisthanus sp. Trinidad, No. 2435. 



