NEW DIMORPHOMYCETEAE. 261 



Were it not for the striking differences between the males of this 

 species and of D. Fetch i it would be difficult to separate them satis- 

 factorily bv means of the female. Thev seem, however, to differ 

 rather constantly in the points above referred to, and individuals of 

 the two may be sorted out in almost every case by the relati\-e size 

 of the perithecium and receptacle. Were it not for the striking differ- 

 ences seen in the males I should not, however, have hesitated to unite 

 them under one name. This difference rests in part on the general 

 form of the receptacle, but especially on the form and coloration of the 

 antheridia; which, in the present species, are quite hyaline, relatively 

 long and slender, with well developed necks straight or but slightly 

 curved. In D. Petchi, on the other hand, the antheridia are short and 

 stout, the region occupied by the individual discharge tubes quite 

 black, ending in a hood-like conformation from which the hyaUne 

 neck, stout and hardly longer than broad, projects almost at right 

 angles. In all the considerable material examined from Ceylon, Java, 

 Borneo and the Philippines there are no individuals which show a 

 transitional tendencv. 



Dimeromyces Gonocnemalis nov. sp. 



Male individual erect, slender. Receptacle consisting of from two 

 to five cells, subec^ual above, the basal cell much elongated, the rest 

 somewhat oblique, slightly flattened. Appendage consisting of four 

 to five successively smaller cells, distally more or less conspicuously 

 enlarged and tinged with dark brown. Antheridia borne on a long 

 slender hyaline stalk, shghth- di\'ergent, straight, the neck and venter 

 more or less deeply tinged with purplish brown, the neck well distin- 

 guished, subulate. Receptacle 34-50 X 9 /u. Appendage 64 X 8 /x 

 at base. Antheridia 50 X 9 /x, the stalk 20-22 n: the antheridia and 

 appendage usually diverging slightly from one another. 



Female individual very variable in size. Receptacle usually cur\ed 

 strongly backward, hyaline to pale yelloAnsh, the upper half or more 

 becoming rather deeply tinged with smoky bro\\Ti : consisting of eight 

 to sixteen cells, more or less, greatly flattened below, oblique only 

 through the general cur\-ature. Primary appendage not abruptly 

 distinguished from the receptacle, soon broken, consisting of not more 

 than six or seven cells, the two or three lower becoming brownish, 

 deeper, and contrasting distally: secondary appendages longer, 

 tending to alternate with perithecia, erect and rather rigid or somewhat 



