MONOGRAPH OF THE LABOULBENIACEyE. 



357 



This species occurs with the next on the legs of its host, less frequently on the thorax or 

 abdomen. It differs from T. mir/'ficus in the form of its perithecia, which are sub-conical, as 

 well as by its symmetrical receptacle. The short stalk-cell and large basal cells of its peri- 

 thecia serve also to distinguish it. 



Teratomyces brevicaulis Thaxtcr. Plate X, figs. 1-3. 



Proc. Am. Acad. Arts and Sci. Vol. XXIX, p. 99. 



Perithecia one to five, purplish brown, long, slender, straight or slightly curved, cylindrical 

 or slightly inflated near the middle, tapering abruptly to the almost truncate apex, much longer 

 than the stalk and basal cells together, the latter concolorous with the perithecium, the stalk-cell 

 nearly hyaline. Receptacle nearly symmetrical, black and quite opaque, except the partly 

 translucent basal cell ; above the opaque portion expanding abruptly to form the broad distal 

 portion, from the numerous small cells of which arise, around the edge, the circle of crowded 

 appendages which surround the perithecia. Larger appendages faintly tinged with brownish 

 purple, consisting of a rather short stout basal cell bearing below, externally, several antheridia 

 and short simple pointed branchlets, above one to several large branches, which in turn branch 

 near their distal ends one to three times successively in the same plane, the basal cells of the 

 branches and primary branchlets usually distally inflated, the ultimate branchlets obliquely 

 septate and blunt, or more often ending in a sharply pointed cell. Spores, 33x4/*. Perithecia, 

 110-120 x 23 ix. Stalk-cells, 50 x 15 fi. Receptacle, 85 x 50 fi. Longest appendages, 100 p. 



On Actobius nanus Horn, Kittery Point, Maine, and vicinity of Cambridge, Mass. 



This species is much rarer than the preceding, which is sometimes associated with it on the 

 abdomen of its host. It is subject to considerable variation in size and in the length of its 

 appendages, but is always readily distinguished by the form of its short-stalked perithecia and 

 the peculiar more or less clavate form of the larger cells of its appendages. The host occurs 

 with Acylophorus pronus, but is less common. 



D1PLOMYCES Thaxter. Plate X, figs. 18-21. 



Proc. Am. Acad. Arts and Sci. Vol. XXX, p. 468. 



Flattened antero-posteriorly, sub-triangular, bilaterally symmetrical, furcate through the 

 presence of a pair of prominent posterior projections. The receptacle consisting of two super- 

 posed cells, followed by four cells placed antero-posteriorly in pairs, of which the posterior 

 produce the characteristic prominences ; the anterior a pair of short stalked perithecia, near the 

 base of which, within and above, arise two or more pairs of appendages, and eventually a second 

 pair of perithecia. Appendages copiously branched, many of the branchlets terminated by beak- 

 like cells. Spores once-septate. 



A singular genus, recalling Teratomyces, to which it seems most nearly allied through the 

 presence of the characteristic terminal beak-like cells of its appendages. The branching of 

 the latter is not, however, sympodial in a single plane, as is the case in Teratomyces, and the 

 general structure of the receptacle is difficult to homologize with that of any other genus. The 



