9 CO MONOGRAPH OF THE LABOULBEXIACE^. 
DICIIOMYCES Thaxter. 
fi 
Proc. Am. Acad. Arts and Sci. Vol. XXVIII, p. 183. 
Receptacle flattened, siib-triangulai; ; consisting of a single basal cell followed by three trans- 
verse series of cells symmetrically placed ; the distal row bearing a pair of perithecia symmetri- 
cal! v placed ; or a single perithecium, the fellow of which is undeveloped, together with certain 
sterile appendages ; the sub-distal row producing a pair of compound antheridia symmetrically 
placed and subtended by one or more sterile appendages. Perithecia symmetrical. Spores once 
septate. Appendages and antheridia as in Peyritschiella. 
This genus, although very closely related to Peyritschiella, is distinguished by the bilateral 
symmetry which characterizes not only the arrangement of the cells of the receptacle itself, but 
of the organs produced from it, namely, the antheridia and perithecia ; altliough in a single 
species (Z). inoequalis) one perithecium only is developed, which is, however, placed symmetri- 
cally in relation to the cell from which, in the other species, a second perithcc 
Apart from this bilateral symmetry, the structure and development of the members of the two 
genera are identical, and were it not for the fact that of the eight species included by them, four 
correspond exactly to one, and four to the other type, the two genera might readily be united. 
The four snccies of Dichomvces are amons; the most strikino" and curious in form of all the 
um arises. 
Laboulbeniaccoe. They have been found thus far only on beetles belonging to the Staphylinida?, 
sncl 
g rubbish in ciiltivated fields. 
In the following descriptions the face bearing the antheridia is spoken of as anterior 
\ 
DiCHOMYCES FURCiFERus Thaxter. Plato VI, figs. 25-29. 
Proc. Am. Acad. Arts and Sci. Vol. XXVIII, p. 184. 
Receptacle consisting of a small basal cell, which is nearly hyaline distally and suffused with 
brown basally, the receptacle above gradually expanding into a more or less fan-like form, the 
basal portion wholly black and opaque, the blackened area extending upward externally and 
including a prong-like projection with one or two appendages at its base, which extends above 
the base of the perithecium and forms the terminal portion of the sub-distal transverse series of 
cells on either side; the latter, seven in number, becoming generally suffused with blackish 
brown, the long rectangular median cell usually more or less distinct, the remainder partly or 
wholly opaque and indistinguishable; the- antheridia lighter brownish. The distal row of cells 
seven in number, their septa straight, thin, and clearly defined; the middle cell of the scries 
bearing distally two appendages, placed antero-posteriorly, the terminal cells of the series on 
either side also bearing two appendages, the inner slightly anterior. Perithecia bent slightly 
forward, tapering very slightly to the blunt apex, which bears a short, recurved, tooth-like pro- 
jection on either side from each anterior lip-cell. The perithecia and distal row of cells faintly 
tinged with reddish purple. Appendages short, simple, hyaline, cvlindrical, with a constricted 
blackish base. Perithecia. 63 x 16-18^. Receptacle: length to b'ase of perithecia about 90^; 
to tips of external projections, 100-120/.; greatest width, 55-60 /.. 
On Philonthus dehilis Grav., Waverlv. Mnss nnrl ir;f+^..,, n^-^ ■»*■... _ 
