158 PROCEEDINGS OF THE AMERICAN ACADEMY 



CONTRIBUTIONS FROM THE CRYPTOGAMIC LABORATORY 

 OF HARVARD UNIVERSITY. 



XX. — NEW SPECIES OF LABOULBENIACEiE FROM 

 VARIOUS LOCALITIES. 



By Roland Thaxtek. , 



Presented May 10, 1893. 



The present paper, which is the fourth preliminary contribution to- 

 wards an illustrated monograph of the Laboulbeniaceae now in prep- 

 aration, is based upon material collected during the past year in Maine 

 and Massachusetts, or derived from the collections of Coleoptera in 

 the Museum of Comparative Zoology in Cambridge, for the privilege 

 of examining which, as well as for numerous determinations of hosts, 

 the writer is greatly indebted to Mr. Samuel Henshaw. 



The additions to the family herewith presented serve nearly to 

 double the number of forms previously known, and from the astonish- 

 ing modifications which many of them exhibit form a very important 

 contribution towards a knowledge of what must inevitably prove a 

 large and varied group. Apart from mere singularity of form, how- 

 ever, the most interesting phenomenon which they illustrate is per- 

 haps that connected with the not unexpected separation of the sexes 

 upon distinct individuals, which occurs in two of the new genera 

 described. 



In the present as well as in the three previous papers above men- 

 tioned, the writer ha's purposely avoided any discussion of the many 

 interesting questions connected with the general morphology of the 

 group and the special development and relationships of the various 

 forms described, since tbese matters, which will find their proper place 

 in the monograph above referred to, could not well be considered 

 in a series of purely descriptive papers. It has seemed, however, 

 best in the following descriptions, to recognize the sexual charac- 

 ter of the appendages peculiar to the group by discarding the term 

 " pseudoparaphysis," hitherto used to designate them, and substituting 



