332 



MOXOGRAPn OF TIIE LABOULBENIACEvE. 



consisting of two basal cells, the outer becoming blackened, bearing terminally a variable num- 

 ber of branches arranged in a single antero-posterior fan-like scries ; the branches mostly furcate 

 near the base, the inner producing short, somewhat specialized antberidial branchlets, bearing 

 terminally two to five anthcridia. Receptacle variable, often short and stout, sometimes elongate, 

 normal in form. Spores, 75-85 x 8 yu.. Perithecia (average), 105 x 75//.. Appendages, longest, 

 about 375 fx. Total length to tip of perithecium, 150-650 \i. Average, 525 fi. 



On Brachinus, several species, Maine to Texas. On B. mexicanus Dej., Oaxaca, Mexico. 



This well marked form, although subject to very considerable variations in size, shape and 

 in the character of its appendages, can hardly be confused with any other species. In excep- 

 tional cases the appendages are comparatively simple, as in fig. 2, in which the inner basal cell 

 bears two ordinary branches in the usual way, but in the great majority of cases this cell 

 becomes proliferous from its inner upper angle, each successive proliferation resulting in a 

 branch, the resultant groups of branches forming, with the outer appendage, a crest-like series 

 (figs. 1 and 3) of very characteristic appearance. The appendages are very apt to be broken, 

 especially the outmost branches, which are often deeply blackened (fig. 3). When growing on 

 the legs and jaws the specimens are usually very small and stout (fig. 1) ; but on other portions of 

 the host very elongate forms often occur. The species is by no means uncommon, and has been 

 found in numerous localities about Cambridge and Kittery (Maine). In two specimens from the 

 last locality, fine trichogynes were obtained which are copiously branched, many of the terminal 

 branchlets having a spiral habit and ending in a distinct knob-like enlargement. The antbe- 

 ridial branchlets, although not as highly developed, recall those of L. variabilis which, however, 

 does not seem otherwise nearly related. The hosts are more often found under stones about 

 ponds and streams, and are recognized by their habit of discharging a cloud of pungent vapor 

 when disturbed. 



m 



Laboulbenia zanzibarina Thaxter. Plate XVII, figs. 1-3. 



Proc. Am. Acad. Arts and Sci. Vol. XXVIII, p. 175. 



Olive brown, the basal cell nearly hyaline. Perithecium rather large, more deeply colored 

 below the somewhat suffused tips of the lip-cells, the latter not prominently distinguished, 

 forming a slightly enlarged, broad, somewhat flat-tipped, almost straight apex. Appendages 

 consisting of two basal cells, the outer producing externally a single obliquely vertical series of 

 branches, their basal cells inwardly concave and bearing externally a secondary series of 

 branchlets arising like the primary ones and producing branchlets of the third order : the inner 

 basal cell producing similar shorter series of branches on either side ; the branches, like those 

 of the outer appendage, some of them producing antberidial branchlets bearing a terminal row 

 of antheridia ; all the ultimate sterile branchlets of both appendages similar, cylindrical, bent 

 slightly towards the perithecium. Receptacle becoming nearly opaque, its dark portions dis- 

 tinctly punctate, cell I hyaline, cell VI continued downward. Spores about 50 fi long. Peri- 

 thecia, 100-110 x 3.7 /x. Appendages (longest), 200 /x. Total length to tip of perithecium, 185- 

 200 !x. 



On Crepidogaster bimacidata Boh, Zanzibar, Africa. 



