CONTRIBUTIONS FROM THE CRYPTOGAMIC LABORATORY OF 

 HARVARD UNIVERSITY. — LXII. 



PRELIMINARY DIAGNOSES OF NEW SPECIES OF 

 LABOULBENIACEAE. — VI. 



By Roland Thaxter. 



Received June 18, 1905. 



With the present contribution, which comprises such new forms of 

 Laboulbeniaceae as have accumulated during the past two years, the 

 writer proposes to close the series of preliminary diaguoses which he has 

 issued from time to time since 1899. With these additions the total 

 number described becomes approximately five hundred, including about 

 forty-eight genera ; and plates illustrating all the forms not included in 

 the writer's "Monograph," comprising not far from one thousand figures, 

 are now completed. It is a matter of regret, however, that the publica- 

 tion of these illustrations must necessarily be still longer deferred, owing 

 to the fact that the writer proposes to be absent during the coming year, 

 and will be unable to give this matter his attention until after his return. 



Dimeromyces Labiae nov. sp. 



Mule individual. Receptacle consisting normally of three superposed 

 cells, the basal projecting laterally to form the base of the lowest anther- 

 idium, bearing distally a two-celled appendage distinguished by a basal 

 blackish septum ; the two upper cells of the receptacle producing two, 

 rarely three, antheridia : the latter short and stout, the efferent region 

 containing the several tubes rather abruptly distinguished from the venter, 

 as well as from the common efferent tube, which curves outward some- 

 what abruptly. Total length to tip of appendage, including foot, 50 u. 

 Appendage 25^. Antheridium 16-18 X 6-7^. 



Female individual. Subhyaline, or straw-colored, consisting of an 

 irregular axis of three or four superposed cells, terminated by a simple, 

 usually two-celled, appendage distinguished by a blackish septum ; the 

 subbasal cell bearing a broad blunt bicellular upcurved appendage or 



