278 MOXOGKAPH OF THE LABOULBENIACE^ 
7 
Proc. Am. Acad. Arts and Sci. Vol. XXIV, p. 8, 1890. 
Rcccpt 
c 
iposcd 
a single row, one or more of which may be appendiculate ; a sub-terminal area consisting of a 
d 
P 
single antheridiiun ; and, lastly, a terminal scries like the sub-terminal, but bearing one, rarely 
two, perithccia centrally placed ; the cells of the series external to the perithecia, and (ho cell be- 
tween them, if there are two, appendiculate. Antheridium conical, compound, f'n-iuing a sharp, 
tooth-like projection on one side. Appendages simple, continuous, separated from the cell which 
bears them by a prominently constricted, usually blackened septum. Spores once septate. Tcri- 
thecia symmetrical or nearly so, the tips ending in four papillae. 
This, together with the following and very nearly related genus Dichomyccs, constitutes a 
peculiarly well marked type among the Laboulbeniacea), and no other form possessing a com- 
pound antheridium, with the exception of Dimorphomyces, presents the sanio f cadency towards 
the production of a bilaterally symmetrical receptacle, which is so perfectly developed in 
Dichomyccs. In the present genus, there is always an irregularity in the form, and an asym- 
metry in the disposition of the cells, especially in the Uvo lower transverse scries ; and thongli in 
" geminata a greater degree of symmetry is attained than in any other species, the lower 
series is always asymmetrical, and in all cases only a single antheridium is ever found. 
The development of the receptacle is comi)aratively simple. The gcrniin.iling spure, as in 
fig. 11, develops a terminal appendage which corresponds to the appendage lying at the left 
of the perlthecium in figs. 8 and 10, or between the two perithccia in fi?. 7. Thclarg.-r, lower 
segment of the spore then divides into four colls, by the formation of three septa (fig. 12). The 
lower of these, the basal cell of the receptacle, undergoes no further modincation, and in the 
smgle species P. curvata, the sub-basal cell remains unchanged. In all the other species, how- 
ever, the sub-basal cell and the two cells above it become divided in a characteristic fashion. 
This dinsion is effected by the formation of. oblique septa cutting off the two upper angles of 
tne cell, as m fig. 13. The small triangular cells thus formed begin to grow obliquely outward 
and upward, as seen at the right in fig. 1.3, and through the formation of further oblique 
dn-Ksjons m these cells the characteristic transverse series result (fig. 14). The number and 
position of the appendages varies in different species and in different individuals, a., indicated 
by the figures, and are quite peculiar in structure and appearance. They are simple and con- 
t^^J'^T"" ^"T^"'"'^'' and always connected with the cell that bears them by a 
t^^:^'^T'::^' "T> ^^^^^^^^^ ^^-^- ^^^ vary in shape fron. a mere bl^d- 
9) 
(fi 
Tl>e appendages of the following genus, Dicl.on.j-ccs, are similar i,i all respects ; 
do appendages occur having a similar appearance. 
Chitonom)' 
sub-terminal member of 
superposed cpIUprmc ti. • ^ \ "" '^'^ suD-rcrramai memuer oi m^ 
P posed eell.ser,es. Their rtructure eorresponds very elosely to that of Din.orphomyccs, e.- 
