MONOGRAPH OF THE LABOULBENIACPLE. 



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cells of which end in papillate enlargements, while one of them produces posteriorly a clavate 

 outgrowth bent abruptly upward near its base and extending free above the apex. Below the 

 base of this projection, and on the same side, the perithecium is prominently hunched. Basal 

 cells of the perithecium often rounded and bulging. Receptacle consisting of from fifteen to 

 twenty superposed cells, somewhat longer than broad, the two lowest always sterile, the third 

 always producing a perithecium, the sixth, more commonly the seventh, producing an anthc- 

 ridium ; the cells immediately above the third producing perithecia or remaining sterile ; those 

 immediately above the sixth or seventh producing perithecia or antheridia or remaining sterile, 

 the total number of antheridia rarely exceeding three ; the perithecia rarely produced two from 

 a single cell. The terminal cells of the receptacle, usually five or six in number, bearing 

 septate, simple, lateral, sterile appendages. The latter straight, usually two borne on op- 

 posite sides of a given cell, but sometimes three or four from the same cell, deeply blackened 

 and somewhat constricted in the region of their basal septum, consisting more commonly of 

 seven cells, the fourth and sixth, and notably the fifth, broader and shorter than the others, 

 the terminal cell longer than the rest and tapering to a blunt tip. Similar appendages rarely 

 produced even below the uppermost perithecium. Spores, very long and slender, 120-130 x 5 fi. 

 Perithecia, 140-160 x 50-60 ; the outgrowth, S5xl0p; the stalk-cell, 50-85 x 25-30 p. 

 Receptacle, 400-680 x 25-35 /u, ; average, 500 x 28 p. Appendages, 140-200 x 20 p. 

 On Pheropsophus sp., Booloo Valley, banks of the Beeas River, Northwest India. 



Sufficiently abundant material of this fine species was obtained from the inferior surface of 

 the thorax and abdomen of an undetermined Pheropsophus from the above-mentioned locality in 

 the collection of the Museum of Comparative Zoology. Although varying somewhat in the 

 number of perithecia developed, it seems to be an unusually constant form. Even the sterile 

 appendages, although they vary in number in different individuals, are remarkably uniform, and 

 rarely vary in respect to the number of cells which compose them. In many cases the first, and 

 sometimes others of the perithecia become aborted, as a result of the non-fertilization of their 

 trichogynes ; and tbere may be three or even more such undeveloped perithecia on the same in- 

 dividual, with from one to three or even four which have reached maturity (Plate IV, fig. 8), so 

 that although there are more commonly not more than two perithecia in a given individual, there 

 may be six to eight, developed and undeveloped, in exceptional cases. In their color, habit, and 

 peculiarly blackened bases, the sterile appendages, curiously enough, recall those of the Laboul- 

 benia (L. Pheropsophi), which infests a similar host in Africa and South America ; so much so 

 that a young specimen, which was the first examined, was for the moment mistaken for an 

 abnormal condition of this species. Owing to the large size of the sexual organs, this form offers 

 unusually good opportunities for a closer study of the sexual processes, and it is to be regretted 

 that it should occur in so remote a locality. 



It seems doubtful whether the lower half of the two-celled body described as the trichogyne 

 is not morphologically a portion of the trichophoric cell, since, though it is separated from the 

 latter by a constriction, no septum is visible between them. In one instance, a second 

 trichogyne was seen developed from the base of this basal half, the first trichogyne having failed 

 to become fertilized. 



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