282 



THAXTER. — MONOGRAPH OF THE LABOULBENIACE^E. 



species, except that the range of C. pusillus is extended to Florida, where specimens were obtained on 

 the margin of Lake Eustis, at Eustis. Specimens of C. Blcdii were also obtained in the collection of the 

 National Museum on Bledius annularis Lec. from Iowa, and on B. nitidicollis Lec. from Michigan. 



The generic type is a clearly defined one, but the species are very variable in respect to the number 

 of antheridial cells in the lateral group, which is characteristic in all cases. An extreme case of this varia- 

 tion is seen in the species described below, in which the antheridium proper is made up of perhaps not 

 more than three or four cells. 



Cantharomyces Platystethi Thaxter. Plate XXXVII, figs. 5-6. 

 Proc. Am. Acad. Arts, and Sci., Vol. XXXV, p. 415. April, 1900. 



Yellowish with a brownish tinge. Receptacle consisting of a small basal cell and a subbasal cell 

 more than twice as large, bearing the perithecium and appendage. Perithecium borne on a rather long 

 stalk-cell, the basal cells continuous with its main body which is inflated below, conical above, the narrow 

 apex truncate or bluntly rounded. The appendage large, its subbasal cell nearly twice as long as the 

 basal, bearing the very small antheridium which forms a short cellular margin below its upper inner angle 

 and apparently consists of not more than ten cells; the subbasal cell terminated by an irregular series of 

 small cells which appear to produce a tuft of branches distally, and from which it may sometimes be 

 separated by a third cell similar to it. Perithecia 80-86 X 35 /i. The stalk-cell 55 X 20 ;i. Receptacle 

 50-70 X 28 /I. Appendages 140-170 



On abdomen of Plati/sfcfJius cornutus Grav., British Museum, No. 449, Kilburn, England. 



This species is most nearly related to C. occidentals which it closely resembles in general form. It 

 is distinguished, however, by the greatly reduced antheridium, which can sometimes hardly be made out 

 in mature specimens, as well as by the distal enlargement of the basal cell of the appendage. The material 

 of this species is unfortunately scanty and in poor condition, the sterile terminal branches of this append- 

 age being broken off in every case. 



LABOULBENIACEtE. 



Genera monoecious or dioecious, the antheridia simple, clearly differentiated, solitary or grouped, 

 free or adnate, but discharging their sperm-cells independently. 



HERPOMYCES Thaxter. 

 Proc. Am. Acad. Arts and Sci., Vol. XXXVIII, p. 11. June, 1902. 



Sexual organs normally separated on different individuals. Antheridia simple. 



Male individual consisting of several (four) superposed cells terminated by a characteristically modi- 

 fied spinous, or by a small foot-like process, or by both ; the basal cell attached by a small normal black- 

 ened foot : one or more of the distal cells giving rise to short branches which may bear from one to several 

 antheridia terminally, or become more or less copiously branched; the branchlets terminated by antheridia, 

 or in some cases sterile. Antheridia long, flask-shaped. The subbasal cell of the receptacle sometimes 

 producing a fertile branch, as in the female individual, from which are produced secondary receptacles 

 which give rise to antheridial branches. 



Female individual consisting primarily of several superposed cells similarly modified at the tip, and 

 attached by a small normal foot; the basal and subbasal cells constituting a "primary receptacle," the 

 latter giving rise to a variably developed fertile branch (sometimes apparently dividing to several cells, 

 each of which may produce a fertile branch) from which is developed a single "secondary receptacle," or, 

 as a result of branching, more than one. Secondary receptacles consisting of a partly double series of 

 cells, variable in number, one or more of which may be fertile, the rest sometimes specially differentiated, 

 or unmodified; those in contact with the host, perforating the chitinous integument by means of fine 

 haustoria. Trichogynes short filamentous simple or sparingly branched. Perithecium borne on variably 

 developed stalk-cells, the ascigerous portion including three tiers of wall-cells, more or less clearly distin- 

 guished from the distal portion, the wall-cells of which are more or less differentiated, four or five in each 



