308 MONOGRAPH OF THE LABOULBENIACK-K. 



ing with it, as is usually the case ; so that all the younger asci are seen pointing outward and 

 downward (Plate III, fig. 3). The spores arc unusually minute in proportion to the size of the 

 perithecium, and it is possible that the asci may be eight-spored. Seen within the perithecium, 

 however, they seem to be four-spored. 



Rhtzomyces ctenophorus now sp. Plate III, fig. 3 ; Plate IV, figs. 1-4. 



Perithecium, including its basal cells, dark amber brown, asymmetrical, the lower half some- 

 what inflated, the rather truncate tip not distinguished from the tapering, neck-like, slightly bent 

 upper half; the sub-terminal wall-cells marked by fine transverse striations ; the lower half not 

 distinguished from the basal cells, which are themselves abruptly distinguished from the long, 

 slender, cylindrical stalk-cell. The basal cell of the receptacle rounded below, about half as 

 large as the sub-basal, the rhizoids rather copiously and irregularly branched or lobed, colorless. 

 Appendage shorter than the stalk-cell of the perithecium ; the axis simple or exceptionally fur- 

 cate near the base, consisting usually of about thirteen superposed cells ; the basal cell small, 

 blackened and somewhat constricted ; the rest producing antheridial branches always on the 

 same side, forming a unilateral series ; the branches in turn several times more or less sympo- 

 dially branched ; the branchlets distally somewhat indurated and suffused with blackish brown, 

 the whole forming a comb-like tuft ; the ultimate branchlets curved outward and downward. 

 Antheridia long, flask-shaped, sessile, borne rather irregularly, one to four together, from the 

 upper surface of the basal cell of the antheridial branch ; sometimes also from the sub-basal cell. 

 Spores, 25 x 3 /jl. Perithecium, including basal cells, 180-200 x 62-70 /j- ; smallest, 120 x 35 \i ; 

 the stalk-cell, 275-620 x 35 /jl ; average, 550/^ long. Appendage, longer, 325-340 \i ; greatest 

 diameter of axis, 17 /x ; antheridial branches, longer, 45-50 /j,. Receptacle, 60 x 45 p. Rhizoids, 

 longer, 86 x 13 fi. Total length to tip of perithecium, longer, 800-880. 



On Diopsis thoracica Westw., Coffee Hill, Liberia (O. F. Cooke) and Zanzibar. 



This fine species was found growing in a tuft on the soft chitin of the lower surface of the 

 abdomen of its peculiar host, and although it is difficult to detach the plant without breaking its 

 rhizoids, a few specimens were obtained which show them little injured, and with portions of the 

 host's integument still adherent about the constriction which separates them from the basal cell 

 of the receptacle. The appendage is among the most striking in the group, and from the flat, 

 uniseriate arrangement of the sterile branchlets from the antheridial branches, bears a certain 

 resemblance to a large comb or series of small combs. The branches which arise at or near the 

 extremity of the appendage are usually wholly sterile, and in the fertile ones there is little regu- 

 larity in the number of antheridia. The striation of the sub-terminal wall-cells of the perithe- 

 cium seems to be a constant and peculiar character ; but is not so conspicuous that it might not 

 be readily overlooked. 



LABOULBENIA Montagne and Robin (1853). Plates I-IV, XIII-XXII. 



Receptacle consisting typically of seven cells, exclusive of three small cells which form the 

 base of the perithecium ; the two lower (cells I and II) superposed and forming the receptacle 

 proper ; the cells above them arranged in an anterior and posterior series, the latter consisting 



