294 



MONOGRAPH OF THE LABOULBENIACEiE. 



the latter, I have concluded to separate it, basing the new genus on the greater number and 

 different arrangement of the small appendiculate cells bearing the lower appendages, the different 

 number of wall-cells in the perithecium and the fact that three of the lower cells of the recep- 

 tacle are superposed. The genus Chitonomyces, although so closely allied, shows no variation in 

 these respects. The relation of the mature perithecium to the insertion of the trichogvne, and 

 the considerable growth of the former beyond it, recalls the similar relation existent in Cera- 

 tomyces, while the same is true to a less degree in Chitonomyces. Although these three genera 

 are all aquatic, it does not seem probable that the similarity just referred to indicates any close 

 relationship with Ceratomyces in view of the very different character of the male organs in either 

 case. 



As in Chitonomyces, material has been lacking for a proper study of the younger stages of 

 development, and the character of the trichogyne and antheridium has not been made out. In 

 one specimen the procarpe was distinctly seen, and an attempt was made to represent it in fig. 

 24, Plate VIII. The trichophoric cell here was large and slightly inflated, lying close beside 

 the inner appendiculate cell. The septation in this figure is somewhat misleading from the fact 

 that it does not represent what is visible in a single plane. 



There seem to be at least two if not more ascogenic cells in the mature perithecium, 

 but their structure and early development have not been seen. It is needless to say that both 

 these genera are in a most unsatisfactory condition in so far as concerns their development, and 

 were it not for the discovery of the new genus above mentioned as intermediate between Chit- 

 onomyces and Peyritschiella, their position would be entirely uncertain. The single form 

 inhabits species of two genera of aquatic beetles belonging to a family (Haliplidas) no other 

 members of which are known to be attacked by Laboulbeniacese. 



HYDRiEokYCES Halipli Thaxter. Plate XXVI, figs. 31-33 ; Plate VIII, figs. 22-24. 



Heimatomyces Halipli : Proc. Am. Acad. Arts and Sci. Vol. XXVII, p. 32. 



Strongly suffused with dull amber-brown. Perithecia rather evenly inflated, the extremity 

 evenly rounded, the lip-cells forming a flat, hyaline, abruptly projecting terminal papilla. Basal 

 cell of the receptacle rather long, tapering below, its base suffused with blackish, the two cells 

 superposed above it broader than long, nearly equal : the terminal cell more or less conical, the 

 three lower appendiculate cells nearly as large as the terminal one, and almost completely hiding 

 the sub-terminal cell on the left side. Spores, 30 x 3 fi. Perithecia, 100 x 35-40 Total 

 length to tip of perithecium about 150 fi. 



On Haliplus ruficollis DeG., and Cnemidotus muticus Lee, New Haven, Connecticut, and Kit- 

 tery Point, Maine. 



This species seems by no means common, and is found usually on the right elytron of its 

 host or on the legs. A single specimen only has been found on Cnemidotus. 



