MONOGRAPH OF THE LABOULBENIACE^. 225 
> 
I 
I 
* 
> 
spends very closely in all the genera, up to the formation of the procarpe, with certain 
differences of detail ; and in all cases the mature procarpe consists, as in Stigma- 
tonij^ces, of the three essential parts above mentioned. The carpogcnic and tri- 
chophoric cells are practically identical in all cases ; but the trichogyne is subject to 
A^ery considerable variations, even in the same genus. In its most simple form it is 
unicellular^ as in the case of Stigmatonij'ces, Avithout branches, and of no great length. 
Other unicellular trichogjmes may be more or less brnnched, consisting of an nbruplly 
enlarged portion from which radiate more or less irregular short lobes or branches, 
which are the receptive portions, sometimes quite numerous, as in the genera Ainor- 
phomyces and Dimorphomyces (Plate V, figs. 4, 5, 20, and 21), Camptomyces (Plate 
VI, fig. 4); and, to a less extent, in PeyritscbiL'lla and Dicliomyces, both of which 
have trichogynes which arc nearly simple c>r but slightly lobed (Plate VI, figs. IC and 
32). A similar trichogyne appears to be characteristic of Dimeromyccs (Plate IV, 
fig. 17) ; but sufficient material is needed to determine this point. 
The multicellular trichogynes, which are the more numerous, may be branched or 
simple, even in the same species, and sometimes reach a very remarkable degree of 
development; becoming many times septate and copiously branched, the free extrem- 
ities being either straight or more or less definitely spirally twisted (Plate II, figs. 1-5, 
t r, and Plate XXI, fig. 15). The terminal portion of the trichogyne alone is receptive, 
and it is this part which is subject to the spiral twisting, the most striking instance of 
whicli occurs in the genus Compsomyces (Plate XI, figs. 9 and 10), w^ell developed 
specimens of which, like that represented in fig. 9, producing more highly developed 
trichogynes than are found elsewhere In the family. In all cases the receptive tips 
have the same refractive appearance when mature that is noticeable in the correspond- 
ing organs of the Florideae, and the continuity of the protoplasm of successive cells is 
readily demonstnited, as in other parts of the plant. However liighly the trichogyne 
may be developed, it disappears with great rajiidity as soon as fertilization has been 
accomplished, collapsing and breaking off, its point of insertion sometimes remaining 
as a scar-like prominence (Plate II, fig. 14, tr); while less frequently its base becomes 
somewhat indurated and persists even In the mature individual (Plate XXI, fig. 12 
and Plate XVII, fig. 18). In a majority of cases, however, all signs of it have disap- 
peared at an early stage in the development of perithccium after fertilization. 
The process of fertilization, in so far as concerns the adherence of the antherozoids 
to the trichogyne, has been already referred to ; the former in almost all cases being 
carried to the latter, whether thpy arc discharged directly upon it or make their way 
to it by floating passively through the water, which, as we have seen, is opt in a 
15 
^ 
a 
