MONonr.AriT of the lahoulbeniace.e. 265 
septum, and from it arises a second projection, the upper portion of which is cut ofT as before, 
and develops into a primary appendage, external to each primary pcrithcciuin. 'I'iiis condition 
is represented in figs. 2 and 3. Tlio same process mny continue through the production of 
further successive lateral proliferations, new cells being separated as above described, and develop- 
ing upward into new pcrithccia and sterile api)cndages. As a result of this process a fan-like 
habit is developed, a series of alternating pcrithccia and ajij^endages extending obliquely upwards 
on either side from their conmiun j)oint of origin in tlie median line of the receptacle, their 
bases resting upon a unicellular margin (figs. 1 and 5), which results from its iviieatod j»ro- 
liferation. The alternation of pcrithccia with appendages appears to be invariable; except in 
abnormal cases, where, for example, a perithccium has failed to develop, as at the left in fi". 1. 
The appendages themselves present no special peculiarities, and consist merely of a single 
series of superposed nearly cylindrical cells. The perithccium originiifes from a single cell that 
divides into a lower and upper portion, the former the primordial cell of the perithccium proper, 
the latter of the procarpe. The development of the formor is made out with great difficulty, 
the septa being very indistinct. It is probnl)le, however, that it corresponds in general with the 
course of development described as typical in the first part of this memoir ; although in the 
mature perithccium all signs of septa have disappeared, and the cavity of tlie stalk-cell and of 
the perithccium are continuous (fig. 3), the single ascogcnic cell with its ascus mass floating 
free within. 
The spores are of the usual type, and arc once-septalc. As in the genus Amorphomyces, the 
members of any given spore pair produce one a male, the other a female individual ; the two 
sexes being thus invariably associated, as in figs. 2 and 5. 
The male individuals are very similar in the two known species, and are often indis- 
tinguishable. Owing to their minute size, I have been unable to obtain material of the youngest 
stages for figuring, the only early condition observed having been unfortunately lost in an 
attempt to mount it. In this specimen it was evident, as could be inferred from an examination 
of the mature individual, that the anthcridlum was developed as a lateral production from the 
sub-basal cell of the receptacle. The receptacle, as in the female, consists of four superposed 
cells, the two terminal ones sterile. The anthcridlum itself consists of a basal cell, above which 
are three small cells, of somewhat unequal size, from which the antheridial cells arise. The 
latter are arranged in three i)airs ; and all six cells discharge the antherozoids formed 
within them into a common cavity, tliat forms the slightly inflated base of the long tubular 
neck througli which they are finally discharged. The formation and discharge of antherozoids 
continues for a considerable period, so that provision is made for the fertilization of as many 
secondary perithecia as may be formed upon the female individual ; and the number of anthero- 
zoids eventually produced by a single individual must be very gi'cat- 
The genus appears to bear no special relation to Amorphomyces, which, in all essential points 
of structure, with the exception of the remarkable similarity of its trichogyne, is widely different 
in both sexes. Yet it is singular that these, which are, with one exception, the only two 
dioecious genera so far discovered, should inhabit the same minute host. 
Scientifically considered, the three dioecious genera, of which this may be taken as a type, 
may certainly claim a position first in importance among the Laboulbeniacese, if not among tlie 
Ascomycetes as a whole, since their morphology and development would seem to settle beyond 
