TIIAXTER. 



MONOGRAPH OF TIIK LABOULBENIACEjE. 



131 



MlSOOMYCEB Stomonaxi Thaxter. Plate LXX, figs. 7 8. 

 Proo. Am. Acad. Arts and Sci., Vol. XXXV, p. 443. April, 1900. 



Hyaline or pale straw colored. Receptacle consisting of a basal and one or two more single super- 

 posed cells, the cells above these becoming rather irregularly divided longitudinally to form a double; row 

 of variable length, above which a second longitudinal division appears, the receptacle in this region being 

 made up of three-celled tiers as far as the base of the perithecium, above which its distal part consists of 

 several superposed pairs of cells, or of two rows of cells more irregularly distributed, the insertion of the 

 appendages rather indefinite, the cells composing it producing irregular hyaline or brownish branches 

 distally. Perithecium externally nearly straight, the inner margin convex, the tip rather abruptly differ- 

 entiated, straight or curved outward. Perithecia 90-100 X 25-30 Receptacle 300-335 /i. Total 

 length to tip of perithecium 365-400 X 40-45 [i. 



On Stomonaxus striaticollis Dej., British Museum No. 593, China. On elytra. 



This species is based on three specimens, two of which are illustrated in the accompanying plate. 

 It differs from M. Dyschirii chiefly in the form of its perithecium, and in the fact that its receptacle con- 

 sists not of superposed cells but of tiers of cells. It is possible that I am in error in associating these 

 forms under one genus; but until sufficient material can be examined, there seems to be no better disposi- 

 tion possible. A fourth specimen apparently identical with the others was found in the Paris Museum, 

 No. 17, on a small harpaloid (?) carabid from Madagascar. 



CERATOMYCETINEiE. 



Antheridia more or less undifferentiated cells of the appendages or of their branches. The species 

 for the most part aquatic. 



HYDROPHILOMYCES nov. gen. 



Ceratomyces Thaxter pro parte. 

 Receptacle consisting of an indeterminate series of superposed cells indefinitely multiplied by inter- 

 calary division and with occasional longitudinal septa. Axis of the appendage similar to that of the 

 receptacle and continuous with it, giving rise to a double row of branches arising from small cells sepa- 

 rated distally and obliquely from its successive members; many of these small cells nearer the base appar- 

 ently converted directly to pointed antheridial cells. Perithecia consisting of a small and determinate 

 number of cells. 



There appear to be not more than five cells in each lateral and in the inner row of wall-cells, 

 and perhaps but four in the outer, while the perithecium is developed in relation to the trichogyne like 

 other members of the family, and not in the fashion peculiar to Ceratomyces and its near allies which was 

 described in my Monograph. It is possible that I am mistaken in regarding the beaked cells of the ap- 

 pendage (Plate LXVIII, figs. 3-4) as antheridia, since I have seen no actual discharge of sperm-cells; 

 on the assumption that they are, the genus may, however, be provisionally placed not far from Ecteinomyces. 

 At least two more undescribed species on Hydrophilidse have similar characters. 



For a further comparison of this type with the assemblage of species formerly placed by me in Cera- 

 tomyces reference should be made to the last mentioned genus under which these matters are discussed. 



Hydrophilomyces rhynchophorus nov. comb. Plate LXVIII, figs. 1-4. 

 Ceratomyces rhyncophorus Thaxter. Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 446. April, 1900. 



Hyaline. Receptacle long slender, but slightly narrower below, consisting of about forty (thirty- 

 five to fifty) superposed cells, wider than long; those in the lower half more flattened, the foot small. 

 Perithecium lateral, nearly erect, slightly divergent; a short but definite stalk-cell; the basal wall-cells 

 greatly elongated, extending some distance up around the ascus-mass and forming, together with the large 

 elongated inferior supporting cell, a broad sterile base to the perithecium which is not differentiated from its 



