THAXTER. NEW LABOULBENIACE.E. 161 



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 cou- 

 vex while externally it is nearly straight and slightly oblique. Recep- 

 tacle 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 n- Perithecia 340-750 X GO-75 p. Total length to tip of perithe- 

 cium, longest 1150 p; to insertion-cell 340-400 p ; greatest width 120- 

 130^. 



On Dtnc.nles aereus Klug., Brit. Mus. No. 4G1, Hadramaut, Arabia; 

 on Dineutes sp., Brit. Mus. No. 463, Ambaca, Angola, W. Africa. On 

 abdomen, elytra, thorax, and head. 



Laboulbenia bidentata nov. sp. 



Wholly suffused with pale dirty brown. Perithecium rather darker, 

 free except at its base, somewhat inflated below, tapering symmetrically 

 from the extremity of the basal wall-cells to the rather narrow apex ; the 

 two inner lip-cells suffused with blackish brown and projecting beyond 

 the others to form two blunt prominences, their tips hyaline, contrasting. 

 Receptacle rather short and stout, uniform pale dirty brown, incon- 

 spicuously flecked with minute somewhat darker points, the lower part 

 of the small basal cell mostly hyaline. Outer appendage consisting of a 

 basal cell several times as large as that of the inner, bearing a single 

 branch, the basal cell of which is somewhat rounded and gives rise dis- 

 tally to an outer and an inner branchlet, each commonly once branched, 

 the outer deeply blackened at the base (usually broken) : the inner 

 appendage consisting of a basal cell which bears a branch on either side 

 which may be twice branched, bearing solitary antheridia laterally. 

 Spores 50 x 4 p. Perithecia 115-130 X 45 p. Total length to tip of 

 perithecium 220-270 ju ; to insertion-cell 135-150/*. Greatest breadth 

 70 fl . 



VOL. XXXV. — 11 



