un 
3iO MONOGRAPH OF THE LABOULBENIACE^. 
„ iform, but vary greatly in their numbers, being sometimes solitary or nearly so, as in Laloul- 
henia Pachytelis, or produced in great numbers, as in L. BracUni and several others. Their 
arrangement on the antheridi.il branchlcts may be characteristic ; for while as a rule they are 
_r- .-"je solitary, in species like L. variabilis (Plate XXI, fig. 3), or L.proliferans (Plate XYII, 
fig. 23), they are more or less definitely grouped. 
The homologies of the " receptacle " are evidently such as have been previously described 
(p. 206), the cells above cell II (Plate XL fig. 5) representing the union of the stalk-cells of the 
pcrithccium (cells VI and YII; A and j; of the figure), with the base of the appendage (cells III 
to V), the latter (cell V) being, as may be seen when they have been separated by potash, in 
reality a pair of cells placed side by side and appearing like one. The bodies spoken of as the 
*'• a])peudages " in this genus are therefore morphologically only the branches of a main 
appendage. 
With the few exceptions above mentioned, the type structure of the individuals which com- 
pose the genus is remarkably constant and very clearly defined ; so that little difficulty will be 
experienced in distinguishing it from all others. Its immediate connections with other genera 
arc not, however, clear, and its nearest ally is difficult to designate. 
The aquatic forms already enumerated might perhaps be separated in a genus by themselves, 
were it not for the fact that their chief peculiarity, namely, the origin of their appendages, is 
almost exactly paralleled by L. variabilis, which can by no possibility be excluded from I.aboul- 
benia. Unless other more important points of difference should appear, it is impossible thus to 
separate them. It may, however, be remarked in passing tliat L. Gyrini'lorvni is one of the very 
few species in which the character of the antheridia has not yet been satisfactorily made out, 
although the trichogyne is highly developed. 
In the following descriptions the black cell from which the appendages arise is spoken of as 
the " insertion-cell," the cells of the receptacle being nuinbci'cd (I to VI), as in fig. 5, Plate 
11, and the side bearing the peritheciuni is considered anterior. The species are sometimes cos- 
mopolitan, and are very numerous and varied, inhabiting a great variety of hosts, includin^ 
Colcoptera, Diptera, Neuroptera and the Acarini. Many of the forms of wliat I have called the 
"flagellata " type are very variable, and given species may inhabit hosts of many species and 
re 
scnted by L. fiagellata, L. anceps, L. elongata, L. Petero^ticU, L. pohjpliaga, there is much uncer- 
tainty in regard to the identities of many of the varieties. The synonymy in these cases is 
also confused, and some names may have to be discarded. 
LABouLHRxrv RouGETii Mout. ct Robiu. 
T vvTir o?; I ■ ' ^- ' ^^«"^^g"«' Sy"«g'' Cryptog. p. 250 ; Vcy ritsch SItz. d. •Wi,,n. Aca-I. Vol. 
TvvTrr \ ! ' r ' ^''^- ^^'- °^ ^^^^" '"^'^ ^^"'"^- "^^ ^ ^^"^'^ «f Co,.ta;,ion8 ni.sea.so«. Vol. IT, p. 412, Tlato 
ose Fung. Vol. VI I, p. 911 ; Thaxter, Proc. Am. Acad. Art. a..l Soi. Vol. XXIV, p. 12. Sec .also Tlon,et. IVndnc- 
t.on 1 aras., etc. ,n Ann. d. 1. Soc. Entomol. d. France, 1850, T. VIII, p. 21, Plate I fi*-. 1-7 
'' Dark yellow-brown ; Paraphyses inserted on a broad base, irregularly dichotomous, about 
as long as the perithecium, yellow ; stalk much shorter than the perithccium." 
