184 NAIADACES. 
in a membranous spathe. The pollen is simple, as in 
Naias; it undergoes no change in water except, perhaps 
a tendency to become globular: it is held together by some 
means or other, though not firmly, on its exit from the an- 
thers, it is excessively abundant, and of a large size. The 
mobile granules have a truncate appearance, and are generally 
slightly curved ; they are of irregular but larger size. "The 
females are nake 
The ovarium is membranous and terminated by two stigmata 
which do not however present much stigmatic structure. 
The very young ovula are naked, the ovarium resulting 
from the development of two scales, then distinct, between 
which the nucleus may be seen projecting. The mature ovula 
are erect, consisting of one integument? with a large fora- 
men near the hilum, where they form agibbosity. The lower 
margin of this is fringed generally with clavate cells, the func- 
tion of which is no doubt conductorial. The embryo is mo- 
nocotyledonous with а slit; it is enclosed in the embryonary 
ac. 
The female flowers are propped by a subulate leaf, which 
is opposed to that in whose axilla they are, this has an undi- 
lated base, 
4. Naias seminuda Gr. Pls. CCLIII, CCLIV. 
Alternatim ramosa, internodiis abbreviatis. 
Fol. linearia patentia vel recurva subuncialia ; basin versus 
canaliculata, medium supra planiuscula, margo subrectus den- 
ticulatus, ternis rarius in ramulis binis. 
"l. masculi subaxillares, subsessiles, (I have seen one with 
along stalk) albidi, tunica antherz accreta ! apice biloba, lobis 
concavis, margine quasi incrassatis, intus apertis pori more. 
ntherze apex tantum soluta, bilocularis. Apice dehiscence ? 
parietes membranacei tenuis simi-vix solubiles a parietibus 
perianthii. Pollen magnum oblongum apice utrinque qua- 
si incurvo, 
