44 THAXTER. 



Rickia nigrescens nov. sp. 



Nearly s;vTnmetricaI, tapering slightly below to a rather slender base, 

 more or less deeply suffused with blackish brown. Receptacle tri- 

 seriate, the basal cell nearly hyaline below, distally somewhat broader, 

 deeply suffused, and hardly distinguishable from the two short paired 

 basal cells of the marginal series, which become quite opaque: ante- 

 rior series consisting of about fourteen suffused cells, not differing 

 greatly in size, those in contact with the perlthecium slightly smaller, 

 all but the opaque basal one cutting off distally and externally one, or 

 two, small nearly hyaline cells, in the latter case lying side by side and 

 not superposed, which bear appendages or antheridia; the latter 

 mostly from the mid-region: posterior series similar to the anterior, 

 extending about as far, and ending in the base of the primary append- 

 age : median series hardly intruded between the second pair of marginal 

 cells, consisting of usually twelve cells, the upper somewhat smaller; 

 the cells of all the series more or less similar, rather small, subisodiame- 

 tric, or but slightly longer than broad, arranged nearly symmetrically 

 in tiers, of which there are usually nine or ten between the basal cell 

 and the base of the perithecium which is subtended by a well defined 

 stalk-cell. Perithecium slightly more than half free on both sides, 

 deeply suffused with olive brown; straight, erect, nearly symmetrical; 

 the distal half conical; the tip hardly distinguished; the apex hyaline 

 small, rounded. Antheridia somewhat appressed, straight, or the 

 purplish neck slightly curved outward. Appendages hyaline, stout, 

 cylindrical, becoming somewhat gelatinous and coherent, soon disap- 

 pearing. Spores about 35 X 2.5 /x. Perithecia 70-78 X 24 jx. 

 Appendages 20 X 4.5 ^t. Antheridia 12 X 4 yu. Total length to tip 

 of perithecium 150-190 X 32-35 ii. 



On the elytra of Coproporus hi/poci/ploldrs Bernh., No. 1830, Sara- 

 wak, Borneo; No. 2416, Manila, Philippines. 



A deeply suffused species which at first sight suggests a form of 

 Rhachomyces, the receptacle above the basal cell being rather slender 

 and about the same width nearly to the base of the perithecium. It Is 

 closely allied to the following species from which it dift'ers in color, 

 in the greater number of tiers below its perithecium, the more regu- 

 lar arrangement of its cells, and also in the almost sharply conical 

 free portion of the perithecium. 



