;>(,._> THAXTER. —MONOGRAPH OF THE 
IACE^] 
term 
nidi cell anil tne oinerem species may ^ ■» &**,*-. o * - 
B| , ,11 is tenninal at maturity as in figs. 1, 7, 36, 41 etc., Plate XLVI; and a second class m which, 
through a nroce of secondary proliferation more or less pronounced, the spmose cell becomes inter- 
ior of cells forming the axis of the appendage correspondingly increased m number, 
>|nnose 
and the mini 
typ 
azb at hast above the basal cell, bear fertile antheridia, whether they be primary or secondary, as in the 
figure last cited, and those in which the accessory cells of the axis are partly or wholly sterile, producing 
no antheridia w only sterile ones, as in figs. 7 and 13, Plate XLVII. 
In regard to the development, arrangement and number of the antheridia on the appendage, there is 
a good deal of variation in different cases, but these characters appear to be more or less definitely fixed 
sn ttt*4 Hip uinmdflim characters are often the only reliable ones. The simplest 
species 
type of arrangement is that seen in S. purpureus previously cited, in which each cell of the axis having 
cut off a single antheridium, the latter form a series of members superposed in a single row. This type, 
however, is nirely met with, and in the great majority of cases a more or less complete double row is 
formed. ' This condition usually results from the fact that from some or all of the cells which compose 
the primary axis, a second cell is cut off which corresponds to the single antheridium of the simpler type 
and like it is morphologically a lateral branch. This branch then divides in two superposed cells, the 
terminal one being converted directly to an antheridium. The basal cell in turn may then grow out 
sidewise and form a second antheridium on which the first appears to be superposed, or may itself become 
divided to an upper and lower cell each of which is transformed to an antheridium, as appears to be the 
case in S. Elackipterce . The antheridia formed in this manner becoming somewhat divergent as they 
mature, thus come to be more or less regularly biseriate and alternate.' These antheridial sympodia 
from the main appendage correspond in all respects to the corresponding structures of Rhad inomyces , 
in which the antheridia arise successively in a similar fashion (Monograph, Plate IX, fig. 23), although 
they are quite free and usually more than two are superposed. 
In describing the species it has been found convenient to distinguish three regions in the perithecnim 
although they are not well marked in all cases. These are the venter, the more or less swollen ascigcrous 
basal part, the neck often abruptly distinguished and elongate above it and lastly the tip which is com- 
monly distinguished from the neck by a more or less well defined elevation. A typical instance of this 
separation into three regions is seen in the perithecium of figs. 12 and 16, Plate XLIX. In several species 
the venter is marked by granulations or transverse lines as in the figures last cited, but this is often indis- 
tinct without a high magnification. The hosts of the members of this genus are mostly small flies many 
of which, as their names suggest, live near water or in moist places, while others may be swept with a 
net from various flowers or over grass etc., in somewhat dryer situations. It will be remembered that 
S. rirrx, iw occurs on a widely different host, Chilocorus, one of the "lady beetles," and I have one other 
species as yet undescribed which occurs in South America on another order of Coleoptera. It may be 
mentioned here that, although the species almost all grow on soft bodied hosts, no indication has been seen 
of any penetration of the integument such as is suggested by the figures of Peyritsch, and the foot is of the 
usual type, though often small. 
Stigmatomvces purpi reus Thaxter. Plate XLVI, figs. 30-36. 
Proc. Am. Acad. Arts and Sci., Vol. XXXVI, p. 404. March, 190 1. 
Becoming wholly suffused with purple. Venter of the perithecium inflated toward the base, tapering 
distally; the four wall-cells separated by a corresponding number of prominent longitudinal ridges, 
rounded in section, which run spirally, making in well-developed individuals a whole half turn about the 
venter, and becoming sometimes lobulated through the presence of successive constrictions and enlarge- 
ments; neck not abruptly distinguished, except by the abrupt elevations which form the terminations 
of the longitudinal ridges of the venter, rather slender, an abrupt posterior subterminal elevation preceded 
