360 



THAXTER. MONOGRAPH OF THE LABOTJLBENIACE^E. 



serves to distinguish this form, a somewhat similar conformation occurring only in L. Tachyis. Three 

 specimens, only, have been examined. 



Laboulbenia Tachyis Thaxter. Plate LYI, fig. 15. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVIII, p. 38. June, 1902. 



Form slender. Perithecium tinged with brown, relatively small, narrow, erect, very slightly curved 

 outward distally, about three quarters free, tapering slightly to the relatively broad, hardly differentiated 

 tip; the lip-cells coarse, outwardly oblique, with hyaline edges. Receptacle slender, the basal and sub- 

 basal cells hyaline, elongate, nearly equal in length; the distal portion tinged with brown. Basal cell 

 of the outer appendage forming a well defined prominence distally and externally; its upper surface 

 horizontal, the outer half free, the inner half bearing a solitary branch which may be rather elongate, 

 slender tapering; its basal cell short, somewhat inflated, distinguished by dark septa; the basal cell of the 

 inner appendage giving rise to an erect branch on either side similar to the outer. Perithecia 60-75 X 

 10-25. Receptacle 110-100. Appendages longest 220 /(. Total length to tip of perithecium 155-220 fi. 



On Tachys incurvus Say, Cambridge. On Tachy.i sp., Cocoanut Grove, Florida, December. On 

 Tachys sp., Kittery Point, Me. 



This small and slender species is peculiar for the conformation of the basal cell of its outer appendage, 

 the external projection of which varies somewhat in different specimens. R resembles L. microscopica 

 in this respect, but is otherwise quite different. R appears to he a rare species, occurring singly, or in 

 pairs, on a given individual of its minute host. Specimens on the legs may be much shorter and more 

 compact in habit. 



Laboulbenia olivacea Thaxter. Plate LV, fig. 3. 

 Proc. Am. Acad. Arts and Sci., Vol. XLI, p. 315. July, 1905. 



Perithecium nearly free, broader distally, olivaceous brown, paler and subhyaline distally on the 

 inner side; the inner margin bulging characteristically above and curved abruptly outward to the tip, 

 which forms a flat blunt hyaline papilla, turned outward and hardly distinguished from the body of the 

 perithecium, and wholly subtended by a wide blackish suffusion, the outer margin forming a slight curva- 

 ture continuous with that of the receptacle. Receptacle relatively small, the basal cell small, narrow, 

 and quite hyaline, except distally, where it is partly involved in the dark olive-brown suffusion of the rest 

 of the receptacle, which is coarsely punctate in the region of cells II and III, sometimes becoming wholly 

 opaque and indistinguishable from the base of the perithecium, with the exception of cell V and a corre- 

 sponding cell of about equal size which lies external to it, being cut off distally from cell IV, the receptacle 

 being abnormal in this respect. These two cells hyaline or translucent, the whole anterior margin, from 

 the base of cell II to the tip of the perithecium, forming a nearly symmetrical continuous curvature. Outer 

 appendage consisting of a small slightly prominent basal cell, slightly constricted above, where it is sepa- 

 rated by a blackish septum from a hyaline erect slender nearly straight distal portion or branch: the basal 

 cell of the inner appendage somewhat smaller, giving rise to several erect branches, like the outer, which 

 reach about to the tip of the perithecium, or may be longer. Perithecia 80-100 X 32-40 ft. Receptacle 

 90 /(. Appendages 75-110 fi. Total length to tip of perithecium 185-220 X 40-48 fi. 



On legs and on the inferior surface of the abdomen of Lebia sp., Java; Rouyer, No. 1390. 



Closely resembling L. curtipes in general form, but unlike all other species in the regular secondary 

 division of cell IV by a horizontal septum, a condition which appears to be the normal one, as it is present 

 in all of the ten examples examined. This condition is approached in L. Anaplogenii in which, however, 

 the division is not invariably present, and results from a distal proliferation. 



