MONOGRAPH OF THE LABOULBENIACE^E. 



371 



stalk. The great variability in the length of the trichogyne is a further indication that it seeks 

 the antherozoids, continuing to elongate until one of the latter becomes fixed to it, after which 

 it is drawn up into a more or less horizontal position through a curvature at its base (fig. 

 17). In all of the many observed cases, the antherozoid has been found attached to the 

 tip of the trichogyne, a further confirmation of the view just expressed (figs. 17, 18). After 

 the adherence of the antherozoid the trichogyne soon shrivels, remaining for a time as a slight 

 terminal prominence (fig. 25). Meantime one of the cells at the base of the pcrithccium, per- 

 haps corresponding to the secondary stalk-cell of other instances, produces a curious short, 

 blunt, upturned outgrowth (fig. 19) without visible significance. The four cell-rows of the peri- 

 thecial wall then become more or less apparent ; but the exact number of cells in each is 

 determined with considerable difficulty. Six cells may, however, in favorable specimens be made 

 out, and in the single type species the third cell from the tip of each row produces an appendage. 

 These appendages (figs. 10-12, etc.) are so placed that those arising from the dorsal cell-rows 

 are higher than the others, and arise side by side ; while those from the lateral cell-rows spring 

 from opposite sides of the perithecium. They begin to develop by budding outward after the 

 perithecium is nearly mature (fig. 20) and have no special significance, their purpose being prob- 

 ably protective. The terminal cells of the perithecium end each in a short, sharp, slender pro- 

 jection (figs. 9-11). The ascogenic cell appears to be solitary, but this point has not been made 

 out definitely. At maturity the septa of the basal cells of the perithccia are apparently obliter- 

 ated, as are the cavities of the wall-cells. The main body or receptacle of the mature individual 

 is attached by a single large, slightly colored cell, above which it may produce more or less solid 

 cellular outgrowths, simple, lobed, or even branched, and arising from one or both sides. These 

 outgrowths, which are doubtless designed to prevent sudden lateral bending, are very often 

 wholly wanting even in old individuals. The medullary portion of the receptacle, which lies 

 below the perithecigerous area, is made up of cells charged with dense yellowish fatty pro- 

 toplasm. 



Zodiomyces voiiticellarius Thaxter. Plate XXIII, figs. 1-24. 



Proc. Am. Acad. Arts and Sci. Vol. XXIV, p. 263 ; Saccardo Sylloge, Vol. IX, p. 1130. 



Hyaline or livid with a central yellowish tinge, often suffused basally with dull purplish above 

 and including the sometimes nearly opaque basal cell. Perithecia numerous, variable in num- 

 ber, each terminal on a slender cylindrical stalk of two superposed cells, becoming sub-lateral 

 through the production of a short lateral upturned blunt outgrowth, arising from a short cell 

 cut off below its base ; its apex more or less pointed, curved strongly forward from the base of 

 a pair of blunt rather stout sub-cylindrical or sub-clavate recurved appendages, which arise side 

 by side from its posterior surface ; producing laterally on each side, lower than the first, a second 

 appendage, long, slender, curved outward and backward, tapering to a more or less attenuated 

 tip: the body of the perithecium slightly inflated, stouter distally, narrowed towards its base, its 

 basal cells (three?) small and ill defined. Receptacle very variable in size and form, expanding 

 distally to the cup-like extremity from within the margin of which arise numerous crowded, 

 cylindrical, septate, simple or sparingly branched sterile appendages which surround and greatly 

 exceed in length the mass of perithecia ; below more or less attenuated, often producing near 



