PHYTOGENY. 251 



wall of the testa secretes. The albumen stands in no 

 organic connexion with the parts of the seed. That 

 therefore which has become connate with the kernel or 

 nucleus cannot be albumen. 



1324. The arillus can be none other than bud-seeds 

 of the testa, because it is placed under the phyllodiura. 

 It corresponds to the floral involucrum or bracteal scales. 



1325. As the seeds are none other than leaves that 

 have remained stationary in the condition of root, so 

 must they pass through the three leaf-stages. There can 

 be therefore only three principal differences in the seed- 

 formation. 



1326. The seeds of plants with reticular leaves consist 

 of several leaves arranged symmetrically or in pairs. 

 They have necessarily two seed-lobes Dicotyledones. 



1327. The seeds of plants with spathose leaves consist 

 too only of the latter, i. e. the seed-leaves remain encased 

 in each other. They have consequently only one seed- 

 lobe, which also incloses only one plumule Monocoty- 

 ledones. 



1323. This seed-lobe is a phylloidal leaf, whose pa- 

 renchyma has been superabundantly filled with farina- 

 ceous matter or flour. 



1329. That which is named vitellus can be none other 

 than the succeeding counter-leaf. 



1330. What in the Monocotyledons, at least in most 

 of them, and in the grasses, is called albumen, is not so, 

 but only the flour of the seed-lobe. 



1331. The germination of these seeds is nothing else 

 than an elongating of the spathiform seed-lobe into a 

 culm, from the bottom of which radicles spring forth, as 

 out of a bulb. A monocotyledonous seed is in its 

 structure none other than a small bulb with undivided 

 coverings, 



1332. Lastly, the third form of seeds makes its ap- 

 pearance in those plants which have only scale-like leaves. 

 The seed-lobe is wanting in them, and they elongate 

 themselves directly into the. plumule or little stalk 

 Acotyledones. 



