OF ARTS AND SCIENCES. 157 



in its place the term " antheridial appendage," in recognition of their 

 true character. In other respects the terras here used correspond 

 with those previously employed, except that it has been found con- 

 venient to designate the blackened cell from which the appendages 

 arise in typical species of Laboulbenia as the " insertion cell." 



Of the fifty-two new species described, twenty are referred to the 

 genus Laboulbenia, five each to Acauthomyces and Ceratomyces, two 

 each to Heimatomyces and Corethromyces, and one each to Cautha- 

 romyces and Peyritschiella ; while the remaining forms are included 

 under new genera as follows: Haplomyces, having three species; 

 Rhadinomyces and Amorphomyces, each with two species ; Dicho- 

 myces, Cha3tomyces, Idiomyces, and Dimorphomyces, each including 

 a single species. 



DIMORPHOMYCES, nov. gen. 



Sexual organs borne on separate individuals. 



Male individual consisting of a series of several superposed cells, 

 the sub-basal one bearing the large cellular long-necked antheridium. 



Female individual consisting of several superposed cells, from the 

 basal of which arise one to several perithecia and simple sterile ap- 

 pendages. Perithecia asymmetrical ; spores indistinctly septate. 



This and the succeeding genus appear certainly to present instances 

 of genera characterized by an invariable separation of the sexes on 

 distinct and peculiar individuals. In the present genus the anthe- 

 ridium, though resembling that of Amorphomyces in general shape and 

 in the presence of a long neck for discharging the nearly spherical 

 spermatia, is far more highly developed, being proportionately much 

 larger and distinctly cellular near the base. The asci are produced 

 basally from an indistinct ascogenic cell, and the usual septum is 

 scarcely visible in the mature spores. 



DlMORPHOMYCES DENTICULATUS, nOV. Sp. 



Male individual. Receptacle consisting typically of five superposed 

 cells, tapering and more or less suffused with brown distally, the ter- 

 minal cell (when uninjured) ending in a nearly spherical blackish 

 tip. Antheridium arising from the large sub-basal cell of the recep- 

 tacle, its base inflated inwardly, composed of several cells surrounding 

 a central canal connecting with the long brownish slightly curved 

 neck. Total length to tip of receptacle 40 p ; to tip of antheridium 

 50-55 /x. Greatest width 14 p. 



Female individual. Receptacle consisting of three superposed 

 cells, short, the distal cell cylindrical and symmetrically rounded nt 



