262 THAXTER. — MONOGRAPH OF THE LABOULBENIACE^E. 
This aquatic genus forms a very perfect link between the closely allied aquatic genus C hitonomyces 
and the terrestrial genera Peijntschiella and Dichomyces. The antheridium, unlike that of C hitonomyces, 
is inserted laterally, like that of Pcyritschiella, although in a different relation to the perithecium, and 
its character can readily be determined. The regular arrangement of the cells of the receptacle in tiers 
recalls very strongly the conditions in the terrestrial genera just mentioned, although the perithecium 
>mefl to be related to the receptacle as it is in C hitonomyces, the marginal portion, as in this genus, being 
terminated by a similar characteristic, bell-shaped cell. Both the species occur in North America on 
large water beetles, HydrophilidiB. 
Lim.vaiomvces Tropisterxi Thaxter. Plate XXXIV, figs. 14-15. 
Proc. Am. Acad. Arts and Sci., Vol. XXXV, p. 428. April, 1900. 
Perithecium amber-brown, straight, erect, with a slight nearly median inflation, or tapering but very 
slightly to the undifferentiated tip; the upper half free. Receptacle pale straw-colored, distally dull 
amber-brownish, the foot minute, black; the basal cell short and small, the lower tier consisting of two 
cells which are nearly equal, several times as long as broad: the second tier consisting of three cells, the 
posterior one longest, the median longer than the anterior, which terminates in the antheridium, which 
is subtended by four basal cells, two of them outer and lower and separated by oblique partitions, while 
a smaller upper one lies on either side: above the antheridium two vertically elongated cells form the 
clearly defined base of the perithecium; external to these cells, and somewhat obliquely separated from 
_t mm . « m * « » « m ._ _ ^ _ _._— « 
rece 
Jll)OV( 
mary 
eel I h 
eparated by oblique septa 
terminated by small appendiculate cells; the appendages very small, vesicular, brownish below. Peri- 
35-37 (i. Receptacle, distal part 75-110 /*. Appendages G X 3 p.. Total length to 
pentheeium 240 
Museum, No. 47. Mexico. On tip of abdomen. 
This species is conspicuous from its large size and dark brown color, and is readily seen projecting 
from the tip of its host's abdomen. That it has been observed only once on specimens in alcohol in the 
Paris Museum, may perhaps be accounted for by the fact that it appears to be very readily detached, 
and grows in an exposed situation. In any case it has been sought for in vain on the very numerous 
Central and South American Tropistemi that have been subsequently examined. 
Lim.vaiomvces Hydrocharis Thaxter. Plate XXXIV, figs. 16-18 
Hyaline. 
apex blu 
Arts 
April, 1900. 
abruptly 
divergent. 
uiTcqs, us. oasai portion ot the receptacle relatively short and stout but otherwise similar in structure 
to that of I. Troputami; the two basal cells of the perithecium almost obliterated at maturity so that 
its base appears to rest immediately on the antheridium; the distal portion of the receptacle bordering 
the perithecium to its bp, the inner cell becoming almost wholly obliterated in the middle and terminat- 
ing in a short beH-shaped appendiculate cell which is slightly divergent: the outer marginal cell usually 
prohferatmg three, tunes; of the three cells thus formed the two inner, as a rule, produce well developed, 
k» trrri^ i v V ' ^" wvciu ufu w* me primary appendant., wmui ""*„ 
hLT^^J^JfJ? 6 V^dmn. Spores 50X3^. Perithecia 0O-8O X 17-20 7 Receptacle 
50 X 20-26 fi, distal part 50 
gth to tip of perithecium 100 
Appendages, longest, primary 140 /*, secondary 70 fi. 
%Z ttr? ££r!irj^ **>• c ^ «* ■"* «-. *■- 
species the present form, be 
