MONOGRAril OF TOE LACOFinEyrACE.E. 305 
widely distributed, is apparently a rare one, and abundant material is needed for its further 
study. The hosts on Avhich it occurs ^vcrc taken under stones and in moss at the borders of 
ponds. 
CORETIIKOMYCES SETIGERUS ThaxtCF, Platc IX, fig. 6. 
Proc. Am. Acad. Arts aud Sci. Vol. XXVJII, p. 18], 
Perithecium becoming tinged with brown, slightly inflated and <api*ring to fbe blunt njtcx ; 
stalk-cell hyaline, long- Appendages arising from the distal and sub-disfal cells of the recep- 
tacle, consisting of two or three rounded basal cells, which bear nnmeruus h>ng, straight, cylin- 
drical, septate, deep brown branches, some of them once branehcul, the whole curved slightly 
outward and forming a crest-like structure. Basal cell of receptacle hyaline, the rest, including 
the two appcndnge-bearing cells, strongly blackened externally. Fcritliccia, 110 x 35^- Spores 
(measured in pcrithccium), 30 x 4 /i.. Total length of apjicndages, 200/x or more. Two l)asai 
cells of receptacle, 35 X 15 /x. Total length from base to tip of perithcciuui, 200-220 /x. 
On tliorax oi La throb mm nitidulum Lee, Massachusetts; on Z. icaae Lcc, !\Iichigan. 
r 
This species is closely allied to the preceding, yet seems sulTieiently well marked to keep dis- 
tinct. Its appendnges are quite characteristic, recalling those of Laloidhenia crhfata. The 
main axes seem almost obsolete, being reduced to several rounded cells, which form a group, 
from which arise the long, rigid, brown branches. The stalk-cells and lower basal cells of the 
pcrithecium arc much larger than in C.jacohinns^^^ is the perithecium itself. The material 
examined was all obtained from specimens in the Museum at Cambridge, and is not in very good 
condition. 
RITADIXOMYCES Thaxter. Plate IX, figs. 7-15. 
Proc. Am. Acad. Arts and Sci. VoL XXVIII, p. 179. 
Receptacle consisting of two superposed cells, from the upper of which arise one to several 
stalked perithecia and a main appendage ; the appendage consisting of three superposed cells, 
the upper bearing terminally a scries of simple sterile brunches, the two lower i)roducing from 
tlieir distal ends short anthcridial branches or lonir sterile branches or both. Anthcridial cells 
flask-shaped, supei'posed in short series. Perithecia borne on a single stalk cell followed by four 
basal cells ; its wall-cells four in each series. Spores once-septate. Triehogyne filamentous, 
simple or branched. Aseogenic cells, four. 
In some instances the sub-bnsal cell of the receptacle may produce one or more anthcridial 
branchlets directly, in addition to those on the main appendage. The anthcridial cells arc some- 
times single, more often superposed in threes, the upper one being free and terminal. A few 
specimens have been observed in which the anthcridial branchlets, instead of being borne 
directly from the primary appendage, as in fig. 12, arise from some of its ordinarily sterile 
branches. 
The aseogenic cells are readily made out in the paler species, and at maturity four may be 
usually distinguished ; but this number docs not seem to be constant even in the same species. 
In a few instances a peculiar spine, present also in other genera, has been observed near 
20 
