explanation of the plates. 
271 
PLATE THE TWENTY-FIRST. 
Asphyllous Plants . 
Fig. 1. Conjugata decimina. Hydrophytes . Two plants 
coupled together, and very much magnified. 
m The several cells that are coupled together. 
1. A cell throwing out a tube to meet that of the op- 
posite cell, of the other plant. 
c. Cells in which small grains are to be perceived, dis- 
posed in a spiral form, as they appear before the coupling 
of the plants. 
d. Grains passing out of the cell of one plant into the 
conjoined cell of the other plant. 
e. The cell that is being emptied. 
f. The cell into which the grains are passing. 
g. Semin ules that have arisen from the union of the 
grains of the two plants. 
Fig. 2. A seminule of the same, which has ruptured its 
cell, and is in a; state of germination. 
Fig. 3. Conferva rivularis. Hydrophytes. Part of the 
plant very much magnified, as it floats in rivulets : the cells 
filled with an immense number of small grains, appearing 
to be seminules, which by enlarging rupture the mother 
plant and disperse. 
Fig. 4*. Fucus vesiculosus. Thalassiophytee. Part of the 
frond. 
a. Tubercles terminal, containing a great number of 
ostiolated conceptacles. 
I . Mouths, or ostioles of the conceptacles. 
c . Starlike hairs sprinkled over the surface of the frond, 
called stamens by Reaumur, and considered by him as ex- 
cretory organs. 
d. Bladders, globular, frequently in pairs. 
Fig. 5. A part of a tubercle of the same, containing a 
conceptacle cut through vertically, and very highly mag- 
nified. 
a. The conceptacle. 
1. Elytrm ovoid, floating in a mucilage. 
c. Ostioie, or mouth of the conceptacle. 
Fig. 6. Sphserophoron coralloides. Idiot halamecz. A part 
of the plant magnified. 
a. Podetium solid, cylindrical, branched. 
1. Branches divaricated. 
c. A cistule. 
