NEW LABOULBENIALES. 211 



less, of its posterior wall involved in the blackening of the foot; sub- 

 basal cell short, broad, its anterior margin rather strongly convex, 

 especially below; the posterior straight or slightly concave below; 

 its posterior half or more suflused with brownish black, its upper 

 margin horizontal. Appendage erect, or slightly bent outward; its 

 stalk-cell hardly longer than broad, the upper third of the wall in- 

 vohed by a blackish brown shade especially conspicuous on the inner 

 side; the antheridial segment about as large, or somewhat larger, 

 squarish, or slightly broader than long, the antheridial area lateral 

 and external, or somewhat irregular; the appendage above it con- 

 sisting of from three to five cells, flattened, the two lower more so, 

 their margins strongly convex, separated by constrictions at the thin 

 dark brownish septa; the terminal cell producing distally, and one or 

 two of those below it laterally, stout simple more or less erect branches, 

 of which there may be four or five, usually coherent. Stalk of the 

 pcrithecium rather short and stout, its base narrow, more than twice 

 as broad distally, a more or less well defined somewhat irregular con- 

 striction just below the middle: basal cells clearly defined, subequal, 

 irregularly rounded below, slightly concave above, the region some- 

 what prominent on either side below the venter; the venter, neck, 

 tip and very short apex regions rather clearly indicated by corre- 

 sponding depressions of the outline, which is straighter on the inner 

 side, the outer margin usually turning rather abruptly inward at the 

 junction of the neck with the venter; which is somewhat inflated, 

 and includes nearly half the total length of the perithecium, which 

 tapers distally to its broad stout rounded or subtruncate extremity. 

 Perithecium 45-50 X 20-22 jx; the basal and stalk-cell regions about 

 28 X 18 /x. Axis of the appendage, including stalk-cell, 35-40 X 

 15 /z; the longer branches 30 X 6 /z. Receptacle, including foot, 

 30-34 X 18 m- Total length to tip of perithecium 90-112 /x. 



On Trogophlocus sp., No. 1471, Baiios de Apoquindo near Santiago, 

 Chile. 



This species is closely allied to C. Trogophloci Speg. and C. pusiUus, 

 as well as to the two following species, all of which occur on similar 

 hosts, and are characterized by the flattened cells of the axis of the 

 appendage above the antheridial segment, which are separated by 

 indentations and dark septa. It resembles Spegazzini's species in its 

 general form and the suffusion of the subbasal cell; but differs in its 

 smaller size, branched appendage and much less conspicuously taper- 

 ing perithecium. The hosts were found swarming under stones in a 

 mountain stream, in company with a larger form on which the follow- 

 ing species was parasitic. 



