242 THAXTER. — MONOGRAPH OF THE LABOULBENIACE^E. 
Of D. African us; illustrated in my Monograph, I have examined additional material from Cape 
Coast Castle, Africa, on Paclnjkks, in the Hope Collection No. 287. 
Dimeromyces mixutissimus Thaxter. Plate XXIX, figs. 6-9. 
Proc. Am. Acad. Arts and Set., Vol. XLI, p. 304. July, 1905. 
Male individual Receptacle consisting of three cells, the basal externally suffused with blackish 
brown, and projecting beneath the base of the antheridium; the subbasal giving rise to the solitary anthe- 
ridium; while the distal is separated by a blackened septum from a two-celled erect rigid distally spinose 
appendage. Venter of antheridium small, tapering gradually to the stout outcurved neck. Total length, 
including foot, 32 ft. Antheridium 16 X 5 //. 
Female individual. Receptacle very irregularly formed, externally blackened above the large foot; 
consisting of several irregularly superposed cells, the subbasal giving rise to a two-celled prominence 
subtending a blackish tapering appendage, which projects at right angles to the colorless primary append- 
age; the latter two-celled, distinguished by a blackish septum, and often subtended by a similar append- 
age from the same (distal) cell of the receptacle. The single perithecium rather short and broad, tapering 
slightly to the more or less distinctly differentiated somewhat truncate tip. Length to tip of perithecium 
50 ft. Long si a] >pendage 40-50 p.. Perithecium 34 X 10 ft. 
On the inferior surface of the rhabdites of Labia minor Burm., Cambridge, Mass. 
This and the preceding species may prove merely variations of the same form due to the differences 
in their position of growth, and are only provisionally separated. M. Labia? is much less common than 
the present species and has only been seen on the elytra. M. minutissimus occurs not uncommonly on 
the rhabdites, but is very difficult to find and to remove, from its minute size, dark color and appressed 
habit of growth. Both species are most nearly allied to M. Forficulee, although abundantly distinct 
from it. 
Dimeromyces Labile Thaxter. Plate XXIX, figs. 1-5. 
Proc. Am. Acad. Arts and Sci., Vol. LXI, p. 303. July, 1905. 
Male individual. Receptacle consisting normally of three superposed cells, the basal projecting 
laterally to form the base of the lowest antheridium, bearing distally a two-celled appendage distinguished 
by a basal blackish septum; the two upper cells of the receptacle producing two, rarely three, antheridia: 
the latter short and stout, the efferent region containing the several tubes rather abruptly distinguished 
from the venter, as well as from the common efferent tube, which curves outward somewhat abruptly. 
Total length to tip of appendage, including foot, 50 p. Appendage 25 p. Antheridium 16-18 X 6-7 u. 
Subhvaline, or straw-colored, consisting of an irregular axis of three or four 
superposed cells, terminated by a simple, usually two-celled, appendage distinguished by a blackish 
septum; the subbasal cell bearing a broad blunt biccllular upcurved appendage or protrusion, which 
subtends either the single perithecium, or a several-celled appendage similar to the primary one. Peri- 
thecium solitary, colorl. s, somewhat elongate, tapering but slightly to the more or less abruptly 
distinguished rather broad somewhat flattened tip. Total length of tip of perithecium 65-75 u. 
Perithecium 50-60 X 12 ft. Spores about 18 X 12 ft. 
On the elytra of Labia minor Burm., Cambridge, Mass. 
As has been already mentioned, this species is very closely related to D. minutissimus of which it 
may prove a mere variety due to its position of growth. The' material is not abundant, but the differ- 
ences indicated m the figures and descriptions appear to be constant, even the greater number of antheridia 
in the male individuals. The host is n email - - - - - - « 
mlual 
region. 
Forfi 
Dimeromyces Forficulce Thaxter. Plate XXVIII, figs. 9-11. 
Pr °c- Am. Acad. Arts and Sci., Vol. XXXVIII, p. 9. June, 1902. 
Male individual. Receptacle consisting of three superposed cells, the upper distinguished by a 
