OF ARTS AND SCIENCES. 261 



XIX. 



SUPPLEMENTARY NOTE ON NORTH AMERICAN 

 LABOULBENIACEiE. 



By Roland Thaxter. 



Presented by W Q Farlow, January 14, 1891. 



In a previous note '' On Some North American Species of Laboulbeni- 

 acejE,"* the writer gave a short account of the family, at the same time 

 enumerating the North American species then known, with the inten- 

 tion of illustrating them in a monograph, together with any subse- 

 quently discovered forms, as soon as practicable. The additions of a 

 single season, however, have been so considerable, that it seems best to 

 defer still longer a monograph which, if based on the data at present 

 available, could not even approach completeness. A very limited 

 opportunity for observation during the past summer, both as to time 

 and as to locality, has served to more than double the number of forms 

 previously reported ; so that the family bids fair to become a numer- 

 ous one in this country, where with the present additions its members 

 already outnumber all the known exotic species. It seems, therefore, 

 very desirable to obtain further information, if possible, especially 

 concerning extra New England forms, before attemping a general 

 work upon the subject. 



Of the species described below, the very remarkable form which is 

 called Zodiomyces is chiefly interesting, and forms a distinct departure 

 from any of the known genera of the group. In Cantharomyces and 

 perhaps in Peyritschiella an approach is made toward a compound 

 type ; but so high a development of this type as is found in the new 

 genus was hardly to be looked for, and is suggestive of the many 

 interesting possibilities of variation which further study of the family 

 may bring to light. 



Peyritschiella receives one additional species, which indicates that the 

 genus is a well marked one, corresponding to the diagnosis previously 



* These Proceedings, ante, page 5. 



