218 LEMNACEZ, 
nucleus to the inner coat, and I must not omit to mention 
the appearance as if this was composed of two coats. If such 
were the case, the inner would of course represent the nu- 
cleus, but examination ata very early stage is sufficient to 
shew that it does not depend upon this. 
Lemna—Germination of. Pl. CCLXII. Fig. I. 
1. Lateral view of germinating seed just commenced to 
float, a testa, б albumen, c cotyledon, d apex of nucleus ? 
e radicle, f fissure by which the plumule is to escape. 
2. Same viewed in front, a body of seed, d e f have 
same references. 
3. Same laid open to shew the plumule detached from the 
seed, a cotyledon, d e f have same references, g plumule. 
4. Apex of nucleus. 5 Do. vertically, less radiated than 
in Grantia. 
6. 6, plumula separated, a a gemmule. 
7. Gemmule separated. 
8. 8. More advanced, the plumule has taken its exit 
through the fissure, Ва same separated from the seed. 
9. More advanced, front view. 
10. More advanced the plumule is now much exserted, a 
body of seed, d e f g same references. 
105. Plumule separated, at а its attachment, b gemmule. 
10а, Seed etc., detached from plamule, а d e /—same 
references. 
102. Seed laid open, а testa, Б membrane very fine, 
enclosing albumen, it is of a brown colour. 11, lla. 
Plumulz detached at earlier stages than preceding, a a 
attachment, 6  gemmules. 
12. Germinating plant much more advanced, a body of 
seed, 6 radicle, с upper edge of MN d plumule, e 
young frond with its root, a a chalaz 
12a. Same, young frond detached, a dei of seed, 5 
lower lip of fissure "and neek of radicle, c fissure and 
plumule by which the plantule exists, d young frond or 
