THAXTER. — NEW LABOULBENIACEAE. 45 



form, with six wall-cells in each row in addition to the lip-cells ; the 

 base of the trichogyne persistent in the tbrui of a peculiarly modified 

 unicellular appendage. 



It has proved impossible from an examination of the available material 

 of this extraordinary form, to determine the character of the antheridia; 

 yet there can hardly be any doubt as to its true position among the 

 " Exogenae " near Zodiomyces, Euzodiom^ces, and Ceratomyces, its dis- 

 tal appendiculate portion being evidently homologous with the "appen- 

 dage " of the last-mentioned genus. 



Kainomyces Isomali nov. sp. 



Receptacle variably developed below the distal appendiculate portion, 

 sometimes very broad, often much narrower : the cells above the basal 

 cell becoming broader and flattened, and soon divided longitudinally by 

 one or more septa, nearly hyaline and broadly edged wholly or in part 

 below, especially on the posterior side, with contrasting brownish black, 

 which may involve the whole of the cell, except the transverse septa; 

 the blackened area usually characteristically indented above, and some- 

 times involving all but the uppermost tiers. Perithecial branches vari- 

 ably developed, the free portion curving upward, and consisting of from 

 about twelve to thirty-five superposed hyaline cells, which are more or 

 less flattened, usually separated by slight constrictions, the distal one 

 similar to the others and followed directly by the basal cells of the 

 perithecium. Perithecium becoming tinged with pale amber brown, 

 usually short, stout and suboblong, often not distinguished from its 

 basal cells ; the distal end abruptly rounded, the pore subtended by a 

 tooth-like outgrowth, half as long as and paler than the trichogynic 

 appendage, which bears a slight resemblance to a duck's bill, is dark 

 clear brown, somewhat narrower distally and pale tipped, broader toward 

 the base, where it is abruptly constricted and hyaline. Spores about 

 30 X 3.5 jte. Perithecia 72-80 X 40-50 ^ exclusive of trichogynic ap- 

 pendage, which measures 28-32 X 11 fi. Perithecial branch 100-253 p. 

 Receptacle 150-220 X 40 60 p. Antheridial branches about 50 p. 

 Total length to tip of perithecium 250-460 ft. 



On Isomalus Conradti Fauvel. Derema, Usambara, East Africa. 

 Berlin Museum, Nos. 847-848. 



