328 THAXTER. — MONOGRAPH OF THE LABOULBENIACE^E. 
slightly longer than broad, the basal cells forming a hyaline neck bent above the stalk-cell and not dis- 
tingrished Except ill color, from the body of the perithecium, which is nearly straight, symmetrical, dull 
purplish brown, tapering gradually to the slightly asymmetrical apex; the tip hardly distinguished by a 
slight external elevation. Stalk-cell of the appendage more or less strongly curved, or recurved so that 
the appendage bend, downward; the insertion-cell slightly broader than long, blackish purple below, 
separated by a slightly oblique septum from the much larger cell above it, from which four or five branches 
arise distally; the branches simple, or sps 
.-..itheridia. Peritheeia 125-150X30-35 
Receptacle 200-325 X 25-30 p.. 
1 85-4< )0 a. Total length to tip of perithecium 219-490 fx. 
On 
(labelled 
Museum, No. 976. 
The only two specimens of this species that were obtained are figured in the accompanying plate. 
It looks at first sight like a somewhat malformed Laboulbenia, but the essential characters correspond 
exactly with those of the preceding species. The insertion -cell bears but a single appendage, however, 
and the host is not penetrated by any rhizoid. The host in this case is a carabid beetle and the genus 
Selena is said to be synonymous with Ega. 
LABOULBENIA Robin. 
Taken as a whole the characters of this very large and varied genus are remarkably constant as far 
as the general type of structure and development are concerned, and I have little to add to the account 
already given in my Monograph. As I have there pointed out the type is peculiar from the fact that the 
o-ealled receptacle here, is not homologous with that of its simpler allies, like Rhadinomyces for example, 
but includes in addition to the primary two-celled receptacle of such forms, a cell series of very constant 
characters which results from the adnation of the basal portion of a primary appendage with the stalk- 
cell, and usually with some of the basal cells, of the perithecium. This pseudo-receptacle gives rise, 
then, to a single perithecium on one side and on the other to appendages which are in reality branches 
from the adnate primary appendage. The arrangement of cells in this combination is, in general, so 
regular and constant that it has been found possible and convenient to number the successive cells. The 
basal and subbasal cells, representing the primary receptacle of the simpler forms, are numbered I and II 
respectively; the primary appendage includes cells III to V, the latter a double cell which, like cell IV, 
is normally separated from the "appendages" by a blackened insertion-cell. Of the remaining cells, 
cell VII corresponds to the normal perithecial stalk-cell of many other genera, which in this instance is 
never free. 
The more important variations which are met with among the members of the genus are for the 
most part associated with secondary divisions of the distal portion of the "primary" appendage, that is 
to say of cells IV- V and of the insertion-cell. Laboulbenia olivacea, for example, is a unique instance 
in which such a division of cell IV appears to be invariable (Plate LV, fig. 3). In L. Anaphr/enii also, 
although th.- phenomenon is neither regular nor invariable, the same cell may be divided by one or even 
more septa, becoming thus to some extent proliferous distally and externally. The most complicated 
instances of this nature are seen in some of the aquatic species like L. ceratophom, and such forms might 
on this account be put in a genus by themselves were it not for the existence of various species showing 
transitional conditions. 
Normally the free appendages consist of an outer and an inner, arising immediately above the in- 
sertion-cell from corresponding basal cells; but through the subdivision of these basal cells, as well as of 
the insertion-cell, the normal arrangement may be wholly confused, as in the instances last mentioned. 
unusual, is seen in L. prolij 
ns and its varieties (Plate LIU) in which 
may give rise to a more or less copious 
