368 PROCEEDINGS OF THE AMERICAN ACADEMY. 



of the primary appendage, which may be on either side. Appendages 

 suffused with brownish, mostly rather short and stout, 7-18 X 4 /x. 

 Spores 30 X 3 //. Perithecia 70 X 18-20 ijl. Diameter of branches 

 8-10/1, greatest length 460-520 /z, in largest specimens. Basal and 

 subtending cell of primary appendage 18-20 X 4 //, the former rarely 

 divided. 



On Discopoma sp. Trinidad, No. 2433; on Trachyuropoda sp. 

 Trinidad, No. 2429; also an immature specimen from the Amazon 

 on same host; on Euzercon sp., Trinidad, No. 2432. 



When normally developed this curious form appears to be more or 

 less regular in its structure, as above described, but especially when 

 injured or when the first perithecium aborts, secondary branching 

 takes place, and more than one perithecium may be formed. That 

 there is no significance in "anterior" and "posterior" as applied to 

 the main branches of this form, is indicated by the variable position 

 of the primary appendage beyond which thej^ proliferate. The 

 plant has a characteristic sprawling habit, its branches resting on the 

 upper surface of its host, which is its usual position of growth. Unless 

 it is viewed sidewise, the cell-series bordering the perithecium is not 

 visible, and may thus be wholly overlooked. The appendages, as 

 in all the species, are borne from small subtending cells. Among 

 described species it is most nearly allied to R. furcata. 



Rickia anomala nov. sp. 



Hyaline, rather strongly curved throughout above the basal cell. 

 Median cell-series wanting. Basal cell wholly free, longer than 

 broad, of nearly the same diameter throughout. Anterior series 

 consisting of three or rarely four cells, subisodiametric, externally 

 convex, subequal, without appendages. Posterior series of usually 

 nine cells, the two or three lower larger, rounded; the rest smaller, 

 subequal, irregularly rounded; the first, third, fifth, and seventh 

 cells separating distally small cells which subtend appendages, the 

 second cell subtending the basal cell of the primary appendage, which 

 is relatively very large, wholly free, constricted at the base, terminated 

 by a small cell which subtends the appendage proper; the latter 

 somewhat smaller than the others, but otherwise similar, faintly 

 brownish, bladder-like, roundish, or somewhat loViger than broad. 

 Perithecium directly continuous with the anterior series, externally 

 wholly free, rather long and narrow, the tip well distinguished, nar- 

 rowed, its lower half united on the inner side to the distal cell of 



