TIIAXTEIt. — MONOGRAPH OF THE L ABOULBENI ACEiE . 



413 



ceptacle broad, distally tapering to a slender base; the basal and subbasal cells about equal in length, 

 dirty yellowish ; cells 1 1 1 arid VI about equal in length, much darker; the cells above tbem almost opaque, 

 bulging externally below the insertion-cells, which bear numerous short, rounded appendiculate cells, 

 one or two of them larger and opaque; the branches numerous, the branchlets similar to those which in 

 general characterize species of this section of the genus (mostly broken in the type). Perithecia 3X0 X 

 110 /(, the longer spine 40 p.. Receptacle 525 //, or over. Total length to tip of peritheciuni 800 / 185 fi. 



On the tip of abdomen of Dineutes solitarius, Madagascar (?); Sharp Collection, No. 1075. On 

 North American species of Gyrinus. 



Fig. 19 represents the type of this species from Dineutes .soli tar in*. It is distinguished from other 

 described species by its conical spinose perithecium, and straight subfusiform habit. As has been pre- 

 viously mentioned under L. Gyrinidarum, I have referred to this species a form found in various parts of 

 North America on Gyrinus, sometimes associated with L. Gyrinidarum which, though not quite so large, 

 appears to correspond in all essentials with the present species. The dissimilarity of the two American 

 forms was first called to my attention by Professor Faull who had observed them in Canada, but it seemed 

 to me at the time that they were no more than varieties, an error of which I have been convinced by a 

 thorough reexamination of all the material available. 



Laboulbenia bicornis Thaxter. Plate LXVII, figs. 1-2. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 160. Dec, 1899. 



Perithecium wholly free, dark brown tinged with olive, becoming opaque, lighter at the base; very 

 elongate, nearly straight, slightly and gradually inflated from the neck-like base to about the middle, 

 thence tapering very slightly to the tip, which is distinctly though not abruptly differentiated: the two inner 

 lip-cells symmetrical, each terminating in a small rounded prominence which bears a second smaller 

 rounded terminal prominence; from the base of the lower prominence a long slender brown or olive- 

 brown horn-like process grows downward, inward, and upward, the two symmetrical and similar and 

 resembling the horns of an ox; though formed from the inner lip-cells, a slight twist in the wall-cells usually 

 makes them appear lateral or even external. The two outer lip-cells grow beyond the inner and are closely 

 united forming a large bluntly pointed nose-like projection, its inner margin slightly convex, while exter- 

 nally it is nearly straight and slightly oblique. Receptacle short and stout, evenly dark olive-brown; 

 cell I short, slender; cell II abruptly larger, broad and short. The basal cells of the appendages opaque 

 and indistinguishable, giving rise, as in allied aquatic species, to cladophorous prominences, the branches 

 once or twice branched, hyaline, the lower three or four septa dark, the cells between them slightly inflated, 

 the distal portion elongate, cylindrical, thin-walled, blunt-tipped, without dark septa, the whole forming 

 a dense tuft. Spores 125-140 X 7-8 fi. Perithecia 340-750 X 00-75 a. Total length to tip of perithe- 

 cium, longest 1150 /«; to insertion-cell 340-400 /x; greatest width 120-130 fi. 



On Dineutes wreus Klug., Brit. Mus. No. 401, Hadramant, Arabia; on Dineutes sp., Brit. Mus. 

 No. 463, Ambaca, Angola, W. Africa. On abdomen, elytra, thorax, and head. 



This large species is one of the most striking that has thus far been discovered in this genus, and 

 cannot be confused with any other described form. The peculiar conformation of the tip with its remark- 

 able appendages is quite unique and has the appearance of a cow's head (fig. 2). 



Laboulbenia aquatica Thaxter. Plate LXVI, figs. 18-19. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 158. Dec, 1899. 

 Perithecium free nearly to its base, rather short and stout becoming dark olive-brown, the wall-cells 

 very slightly twisted, the blackened tip well differentiated; nearly symmetrical, subtruncate, the lip- 

 edges hyaline, the lip "valves" prominent. Receptacle rather short and distally broad, olivaceous, lighter 

 below. Insertion-cell unmodified, external, about as large as and nearly symmetrical with cell V, the 

 two lying side by side above cell IV. The appendages consisting of an outer basal cell from which is 

 formed a primary dark brown terminal prominence bearing several small branches distally, while about 



