334 



MONOGRAPH OF TIIE LABOULBENIACEJE. 



Laboulbenia decipiens Thaxter. Plate XX, figs. 19-21. 



Proc. Am. Acad. Arts and Sci. Vol. XXX, p. 473. 



Peritheciuni nearly opaque, not punctate, large, slightly and evenly inflated, tapering rather 

 abruptly to the nearly symmetrical apex ; the basal wall-cells forming a short, stout, clearly- 

 defined, hyaline neck ; the septa separating the upper wall-cells, deeper blackish and spirally 

 twisted. Appendages consisting, as in L. Galerita>, of a conical cellular base consisting of one 

 outer and two inner rows of superposed cells, each of which bears a single simple, straight, 

 septate branch, its lower segments slightly inflated, hardly exceeding the tip of the perithecium. 

 Antheridia blackish, with a very long curved neck, borne singly or two together from the sub- 

 basal cell of the inner series of superposed cells. Receptacle as in L. Galeritce, except that 

 cell III extends upward nearly to the black insertion cell of the appendages, cells IV and V 

 being wholly included by it. Color sub-hyaline, with brownish suffusions especially in the 

 region of cells IV and V. Perithecium, 175-278 x 55 a* (smallest, 130 x 37 /a), its stalk-like 

 base, 40-55 x 30 [i. Receptacle (larger), 300 x 75 fi. 



On Galerita cequinoctialis Chaud., Guatemala, and G. nigra, Chev., Mexico. 



This species is remarkable for its close resemblance to L. Galeritce. It is at once dis- 

 tinguished by the position of cell III and by the peculiar twist of its perithecial wall-cells, 

 which are not punctate, as in the latter species, and differs further in the form and size of its 

 antheridia as well as in the branches of its appendages, which are more numerous as a rule and, 

 as far as can be determined, from the rather poor material available, much shorter. The 

 thirty-six types were obtained from specimens in the Museum of Comparative Zoology. 



Laboulbenia mexicana Thaxter. Plate XIX, figs. 1-3. 



Proc. Am. Acad. Arts and Sci. Vol. XXVIII, p. 171. 



Pale amber-colored, the basal cell and mature perithecium more deeply suffused. Peri- 

 thecium large, straight, thick-walled, the black hyaline-lipped apex abruptly distinguished, 

 nearly symmetrical. Appendages hardly exceeding the perithecium, consisting of two basal 

 cells, the outer giving rise to two branches, an outer usually simple, more deeply suffused, 

 and an inner larger, once or twice branched. From the inner basal cell arise two branches on 

 either side, once or twice successively branched, and bearing a few single antheridia laterally. 

 Receptacle elongate, often abnormally septate, the basal cells of the perithecium large and dis- 

 tinct and forming a broad, more than usually well defined base. Spores, 90-100x 7 \i. Peri- 

 thecia, 200-240 x 65 p. Appendages, longest, 220 /z. Total length to tip of perithecium, 500- 

 600 /x. 



On Galerita mexicana Chaud., G. nigra Chev., G. wquinoctialis Chaud., Mexico and 

 Nicaragua. 



One of the largest species of the genus occurring on the elytra of its hosts, where it is 

 conspicuous from its light color. It is of interest as affording an instance of a transitional 

 condition between the ordinary sessile perithecium and the long-necked forms like those of L. 

 longicollis, L. Kuukeli, and others. The lower series of perithecial wall-cells are in the present 



