GRANTIA. 297 
it is curious that their embryo has a greater affinity to that of 
the grand division in question, than any other Monocotyledon. 
Indeed in appearance they are almost exactly alike, but if my 
views are correct, they differ only in reality in the plumule 
being centrical not oblique. 
Lemna has spiral vessels, as well as stomata, in some species 
even the filament is vascular. The induration of the foramen 
secundine is in my opinion an induration of the apex of the 
nucleus. 
Neither is there a lateralslit for the emission of the plu- 
mule. 
Grantia microscopica, Pl. CCLXVI. 
l. Flowering frond. 
2, Same after removal of the flower, shewing the nature of 
the fissure and its regular edges. 
3. Long section of no. 1. 
4. Flower separated. 4a, mobile granules of very irregu- 
lar sizes, abounding in the tissue of the frond about the. 
base of the flower. 
Stamen before dehiscence. 
Anthers just after dehiscence. 
Pollen. 
Pistillum, or rather female flower. 
Ovulum at the time of dehiscence of the anther. 
. Same, testa halved. 
- Young ovule. 
. Do., more advanced. 
. Flower some time after fecundation. 
. Seed of do., testa removed. 
. Long section of do., a testa, b nuclery membrane, 
with its concealed apex, c albumen, d embryo. 
16. Embryo of do., under slight pressure, 
TRON оромо о 
