THAXTER. — 



MONOORAIMI OK Til 10 LA HOU IAI EX I A( ' K.K. 



271 



secondary branches and an antheridium; (lie branchlets proliferous and forming an axis of usually three 

 cells, the lower hearing an antheridium, and each of the two upper an antheridium and a perithecium J 

 there being thus sixteen antheridia, and eight peritheeia in fully and symmetrically developed specimens, 

 which form a dense, spreading, fan-like tuft, the antheridia being in general posterior in position, over- 

 lapping one another between the black sterile appendage and the peritheeia. Antheridium distally 

 broadened and truncate, elongate; the stalk-cells about equal and about one half the length of the body 

 of the antheridium or somewhat longer than this; the cells of the second tier somewhat unequal; the cells 

 of the third tier smallest; the terminal cells prominently rounded distally, the appendieulate cells usually 

 prominent, forming papilhe which are subtended by the appendages, all four of which do not always de- 

 velop; these appendages relatively short, two to three-septate, tapering to a blunt point, distinctly inflated 

 above the slightly constricted base. Perithecium relatively large, straight or slightly curved, somewhat 

 inflated below, tapering gradually to the rather short, moderately well distinguished tip; the apex bluntly 

 rounded, the basal cells relatively small; the stalk-cell variably developed, its distal end usually somewhat 

 broader than the basal cells collectively, sometimes more than half as long as the body of the perithecium. 

 Spores about 50-55 X 4-5 pi. Peritheeia 130-185 X 35-55 p., the stalk-cell 35-100 X 18-25 p. Antheri- 

 dia 70-75 X 22 p, its appendages 45-50 p. Receptacle about 35 X 28 p. Greatest general length and 

 width of largest individual 350 X 300 p. 



On Aleochara rufipes Boh., Derema, Usambara, East Africa. Berlin Museum, Nos. 844 and 845. 



A very striking species remarkable for its method of branching and the large number of antheridia 

 produced. The figure shows a well and symmetrically developed individual, but many produce but few 

 antheridia and peritheeia, and one of the primary fertile branches may be altogether lacking. 



Monoicomyces Oxypod^e Thaxter. Plate XXXV, figs. 11-13. 

 Proc. Am. Acad. Arts and Sci. , Vol. XXXVIII, p. 10. June, 1902. 



Receptacle very small, the two cells subequal, the basal cell involved by the blackening of the foot 

 and hardly distinguishable; the primary appendage straight and tapering, its basal cell hyaline, nearly 

 isodiametric; the subbasal cell brown, slightly inflated and twice as long; subbasal cell of the receptacle 

 giving rise to a branch on either side; one usually sterile, short, blunt, extending externally above the 

 subbasal cell of the primary appendage, and wholly blackened to its base: the other fertile; consisting of 

 a single cell which is brown, broadly blackened externally, the blackening involving its narrow base almost 

 completely; its distal half becoming more than twice as broad, and giving rise normally to a single an- 

 theridium terminally and a stalked perithecium subterminally on its inner side; stalk of the antheridium 

 brown, two-celled equal in diameter to the branch-cell which bears it, and becoming like it externally 

 blackened; the functional portion of the antheridium stout, distally rounded and slightly sulcate; one only 

 of the cells separated from the upper tier growing out to form a colorless appendage. Stalk-cell of the 

 perithecium arising immediately below that of the antheridium on the inner side, its narrow base black 

 and opaque, resembling a "foot," distally hyaline, broader, about as long as the antheridium; the basal 

 cells hyaline, rather small; the perithecium faintly purplish, rather long and narrow, relatively large, the 

 tip rather abruptly distinguished and usually slightly bent. Spores 45 X 4.5 p. Peritheeia 75-90 X 

 18-20 p. Antheridia 25-35 X 107 p, the appendage 40-50 p. Receptacle 10 p, its appendage 75 p. 

 total length about 150-165 (i. 



On the inferior tip of the abdomen of Oxypoda sp; Intervale, N. H., July 17, 1901. 



This species, which is apparently very rare, since I have sought for it in vain since the single infested 

 host was found, is certainly rightly placed in this genus, its chief peculiarity being the production of a 

 short black infertile branch which appears to arise from the subbasal cell of the receptacle. It is diffi- 

 cult, however, to determine exactly the origin of either of these branches on account of the suffusion about 

 the base. In one or two specimens the fertile branch gives rise to more than one perithecium or antheri- 

 dium. The species is not related to Kleidiomyus furcillafus, the antheridium of which is of a different 

 type. The host is a small staphylinid common in decaying vegetable refuse. 



