/ 
MONOGRxirU OF THE LABOULBENIACE^. 295 
AMORPIIOMYCES Thaxter. Plato V, figs. 17-29. 
Troc. Am. Acad. Arts and Sci. Vol. XXVIFT, p. 158. 
Sexual organs borne on separate individuals. 
Male 
individual. Receptacle consisting of two superposed cells, the upper bearing terminally 
a single simple antheridiuui. 
Female individual. Receptacle consisting of a single cell, above which four (?) small cells 
form the base of the solitary terminal perithecium. Spores continuous. Asci four sporcd. 
Ascogenic cell solitary. Trichoirvnc a nearly sessile vcsciclc with short radiate branches. 
¥< 
fiorUanuti, is gcner 
even nearly related to it. The genus is among the most interesting of the whole group, not 
only from the fact that the sexes arc separated on different mdividiials, but from the peculiari- 
ties of its development. It is the only form in which the perithecium is a strictly terminal 
structure, and, unless it be Dimorphomyces, no other genus has a unicellular receptacle. 
The general development of the female is indicated by figures 20-28, the latter showing the 
first two septa which form in the germinating spore, dividing it into three Bujjcrposod cells. 
Of these the lower, which may become partly divided, forms the unicellular receptacle; while 
up|)cr gives ] 
development 
(0 
I 
(fig. 23 at the right) 
As in the case of the female 
2lls. Of these three cells the 
two lower remain unchanged, and may be called the receptacle ; although, from analogy witli the 
female, one might infer that the middle cell was morphologically a basal cell of the antheridium. 
The terminal cell then elongates, producing a long tubular neck through which the antherozoids 
formed in its basal portion make their escape (fig. 20, at the right). 
The spores are unique from the fact that even when fully mature they show no signs of septa* 
and their contents are exceptional in containing a number of large oil glohnles (fig. 29). They 
are always discharged in pairs, the members of which thus develop side by side. It is also an 
invariable rule, the existence of which has been established by very numerous observations, that, 
of the members of any such spore pair, one always produces a male and the other a female. 
Even at the time of discharge there often is observable a slight difference in the size of the two 
(fi 
As 
(fig. 23) 
of development results which has just been indicated. When the female individual is mature, 
if care is taken in removing it from its point of attachment, it will always be found that a male 
individual is attached close to its base, the feet of the two individuals being adherent (fig. 17). 
A similar juxtaposition of the sexes at the point of growth has already been noted in con- 
nection with Dimorphomyces. 
The trichogyne bears a striking resemblance to that of the last mentioned genus, and in some 
instances its radiating branches are furcate, as in fig. 24. The base of the trichogyne, as in the 
case of Stigmatomyccs which has been described in detail elsewhere, is formed from a small cell 
