PHILYDRIUM. 231 
The pileus of the inner membranne is just like that of 
Lemna!. The Embryo reguires more examination as well as 
the venation of the stamens. | 
I do not understand the coalescence of cells at the apex, - 
in young states 
The pollen чи from the period which the mass is dis- 
tinctly cellular, are measured, so as to be proportional. 
Philydrium stages of development. Pl. CCLXX. 
[1. Each cell is filled by a membronous bag, crowded with 
grumous matter already beginning to be nucleary and 
aggregated, the aggregation is I think, irregular. 
2. Anterior posterior and lateral. 
3. Pollen grains forming a mass in each cell, simple, im- 
bedded, in reddish mucilaginous tissue, each grain con- 
tains a number of knife-like parts—raphide-bundles, no 
common cellular membrane. 
3’.d, Anticous sepal, c e petals, 6 stamen, a pistil, part next 
the stamen very faintly marked. 
4. Stamens etc. more advanced, a anterior sepal. 
5. Pistil etc. more advanced. 
6. Ditto more advanced. "Together with Pollen. 550. M. 
taken from an anther when the grains were slightly 
coherent, and now almost all are quaternary, so that 
the irregular aggregation of the earlier stage seems to 
be accidental. Whence it follows that all compound 
grains are not structurally so. 
7. Plan of vascularity of the style. 
The above sketches of development are numbered pro- 
gressively from 2 to 7. According to the stages of develop- 
ment.] 
Philydrium lanuginosum. Pl. CCLXIX. 
1. Apex of spike. 
9. Flower nat. size. 
