THAXTER. — NEW LABOULBENIACE^J. 155 



side, the inner lips black-margined, curved outward over the outer lips in 

 a characteristic hook-like fashion. Receptacle uniform dirty olivaceous, 

 cell I paler, the cells about it faintly punctate. Insertion-cell black, 

 broad, indistinguishable from the blackened basal portions of the basal 

 cells of the appendages. Outer appendage consisting of a large nearly 

 triangular basal cell, becoming wholly blackened except its upper margin 

 and surmounted by a series of usually six superposed hyaline cells 

 curved toward the perithecium, each cell producing externally a single 

 simple banch consisting of a basal portion made up of two roundish 

 short cells constricted at the dark septa and a distal portion six or more 

 times as long, tapering, hyaline or tinged with brownish ; the inner 

 appendage consisting of a basal cell wholly or almost wholly black, giving 

 rise on either side to a short series of cells, usually three or four, similar 

 to that of the outer appendage and similarly branched. Peritliecia 

 225-245 X 40jU (including neck, which is about 18 (i long). Total 

 length to tip of perithecium. average 450 ju; to insertion-cell 200 u, 

 greatest width 50 u. Appendages 150 p. 



On Galerita unicolor Dej., Brit. Mus. No. 516, Amazon River. In- 

 ferior surface of prothorax. 



Laboulbenia Aerogenidii nov. sp. 



Form short and stout. Perithecium suffused with smoky brown, trans- 

 lucent, becoming distally rather abruptly subhyaline, contrasting with the 

 abruptly differentiated tip; the latter black-brown, opaque or nearly so 

 below, the lip-cells usually symmetrical, rounded, spreading broadly 

 and rather abruptly, the lip-edges translucent ; sometimes asymmetrical 

 with the inner lip-cells only prominent and the pore external : the wall- 

 cells with a slight spiral twist. Receptacle hyaline below, becoming 

 more or less tinged witli smoky brown above, especially cells III and IV 

 and the region immediately below the perithecium ; the suffused parts 

 indistinctly punctate. Appendages consisting of two basal cells ; the 

 inner producing two short branches on either side, which usually bear a 

 rather compact cluster of antheridia; the outer giving rise to from two 

 to four branches placed antero-posteriorly with more or less regularity, 

 the outer for the most part soon broken and deeply blackened, the rest 

 especially the outermost more or less suffused with brown, commonly 

 twice branched, above the basal and subbasal cells, elongate though for 

 the most part broken. Total length to tip of perithecium 200-220 fj. 

 Appendages 200-250^. Perithecium 110-120 X 35-45^, the apex 

 reaching a width of 35 /j. 



