THAXTER. — ARGENTINE LABOULBENIALES. IGl 



from above downward (within ontward), one, however, always sub- 

 tended by twt) minute cells plaeetl not always next the peritheciuni, 

 and representing the primary and originally terminal appendage. 

 Perithecium short and stout, but slightly longer than its contained 

 spores, subellipsoid to ovoid, the tip hardly distinguished, the apex 

 truncate-papillate. Spores 28X4 m- Perithecia 40-50X27-.'^] /x. 



Receptacle 00-75 X 28-85 m- Appendages 20-55 n. Total length 

 75-120 M, average 90-100 fx. 



On the abodmen etc. of Lispinus tenellus Er., Llavallol No. 1502. 

 Also from Los Amates, Guatemala, No. 1625 (Kellerman). 



Were it not for the fact that the genus Rickia, as illustrated by the 

 material accumulated from various parts of the world, proves to be 

 a large and very varied one, I should be inclined to separate the present 

 form under a special generic name; and, although it seems best to 

 treat it as a very simple type of Rickia, it differs from all others in the 

 fact that all its appendages come from the two distal marginal cells. 

 In a few specimens I have seen a structure associated with the appen- 

 dages which may be an antheridium; but, in a majority of individuals 

 these organs seem to be quite absent. This appears to be the case 

 also in other and more typically developed species of the genus. 



Rickia Melanophthalmae nov. sp. 



Hyaline. Perithecium long-ovoid, with a broad truncate apex 

 which may be flat or slightly sulcate, the lumen of the basal wall-cells 

 obliterated, their thick walls forming an ellipsoid cavity in which the 

 spores, which nearly equal it in length, lie somewhat obliquely, and 

 above which the three upper tiers of small subequal wall-cells persist. 

 Receptacle broad and compact, multicellular above the single basal 

 cell; the cells in three vertical series, two lateral and one median; one 

 of the outer consisting of a single somewhat elongated cell, which may 

 rarely be divided into two or three cells, above which lie the three 

 visible basal cells of the perithecium, which are subequal and form an 

 integral part of the receptacle in no w'ay distinguished from it; the 

 marginal series on the opposite side consisting of two to four cells, 

 usually rather narrow, each usually cutting off a small cell obliquely, 

 distally and externally, the uppermost subtending a hardly distin- 

 guishable antheridium, the rest developing neither appendages nor 

 antheridia and often becoming wholly obliterated; the series termi- 

 nated by a small cell which bears the small short stout primary append- 

 age of the usual type; the median series consisting of three superposed 



