THAXTER. — MONOGRAPH OF THE LABOtJLBENIACFJK. 220 
seems to be entirely so as far as the oell relations in development are concern* I, a single instance has 
been found among the recently discovered genera in which the antheridial evils, nit hough they almo* 
certainly originate as in typical compound antheridia, become ultimately free in a compad group, each 
discharging independently; the cell below which they were formed ml through which they would nor- 
coinm 
opment. The genus Dutichomyces in which the conditions just described ap|>ear to exist, is so closet 
allied to Rickia that it might almost be included in it, vet in Rickia highly specialized compound antheridia 
are present." Moreover the close relationship of both these genera to the group of genera assembled 
about Peyrifschiclla, and possessing typical compound antheridia, cannot for a moment 1 questioned 
If therefore, one makes an absolute distinction based on the characters of the matu antheridium, as has 
been done in the tentative key to the genera herewith appended, the genus Dutichomycei Would naturalb 
be sought among the "Laboulbeniaeese" where it certainly doe not belong. 
The type of the simple antheridium is in genera] a very constant one. although there may be a rather 
wide variation in the minor characters, the form of the venter, length and curvature of the neck, and 
the relative proportions of its two parts. The relations of the simple antheridia to one another, when 
formerly 
gmat 
many species have recently been added, illustrates this condition very clearly, although in this highly 
differentiated appendage, the antheridial cells are not always, or even usually, as was formerly stated, 
superposed in a single row, as is the ease in 8. riresccu.% or S. purpuras, Plate XI .VI. fig. 36; but I leiie 
of sympodia is formed, each antheridial branehlet separating a basal cell, which in turn grows ont directly 
to form a second anthe 
port 
Plate XLIX, fig. 13. The lowest groups may even produce more than two antheridial cells, as in 8. 
constrict™, Plate XLVI, figs. 1-2. This last condition tends to break down the distinction Ik d mi 
antheridial series between this genus and Arthmrhynekus, Plate XLVII1, in one species of which, fig. 3, 
>ry similar. A single type in which the antheridia are strictly intercalary, like those 
of Carethromyces, has been added in the genus Sywplrrtmn, !r . Plate L, figs. 11 10, but this relation ap- 
the arrangement is v 
associ 
iefinite in certain eases. In a majority of the specie* of SUgmUomgc*, for d mple, this character seems 
spe 
the antheridial branch is also a monopodium, there is absolute irregularity in this leap ... A new and 
very individual type of appendage somewhat similar to that of SUgmriomjfeet is seen in I Dflipomyost, 
and another less well defined in Acallom;^; these appendag. * being in general Simpler and tending to 
(f, > 
dial cells, and those in which the latter are irregularly placed. A few instanc OC«ir in which the group- 
condition best 
genus Laboulbenia, by such species as L. Oezeme, Plate I AIII, fig. 1 1, or L. mM&». 
The transition between simple, but distinctly differentiated, antheridial ells, and the undilL r- 
rpose 
bee 
i« 
although they discharge their contents in a similar fashion, arc evidently variable in size aval form, 
