402 Hill.- — The Morphology and Seedling Structure of the 
similar in general outline, being more or less oblong, but the absorbent 
cotyledon has only a single median vascular bundle, whilst the other has in 
Text-figs, of Peperomia Seedlings. 
pt — wall of the seed ; s = the remains of the style and micropyle pushed to one side ; 
pm = perisperm ; e = endosperm ; c — cotyledons ; lc L — lamina of absorbent, lc 2 = lamina ot 
assimilating cotyledon ; h — space left in the endosperm by the removal of c 2 ; wt = water-storing 
tissue ; pi = palisade-tissue ; p — plumule ; hyp — hypocotyl ; R — primary root. 
Figs, i and 2. P. pelhicida (after Johnson). 
1. A young seedling in median longitudinal section. The two cotyledons are being withdrawn 
from the endosperm. 
2. The seed in transverse section, showing the two similar cotyledons surrounded by the 
endosperm. The perisperm forms the bulk of the reserve tissue of the seed. 
Figs. 3-5. P. peruviana. 
3. A seedling in median longitudinal section, showing the seed with one slightly peltate 
cotyledon lying in the pouch of the endosperm. The other cotyledon {c 2 ) has been withdrawn 
from the endosperm, leaving a hollow space, and will form an assimilating organ. The palisade- 
tissue {pi) is indicated beneath the water-storing tissue {wt) on the upper surface of the lamina. 
The hypocotyl is becoming swollen to form a corm. 
4. A seed in transverse section in an earlier stage of germination than Fig. 3. The laminae of 
both the cotyledons are still within the seed. The two laminae show dissimilar structure ; that of the 
absorbent cotyledon, lc x , remains undifferentiated with a single median vascular bundle, whilst 
the lamina of the cotyledon which will become the assimilating organ shows a trace of water-storing 
tissue and of the palisade-layer on its upper surface ; also there are three vascular bundles. 
5. A seed like that in Fig. 3 in transverse section ; the assimilating cotyledon has been with- 
drawn, leaving a hollow space ( h ) within the endosperm ; the other cotyledon {lc x ) is left in the seed 
as the absorbent organ (cf. Fig. 16, PI. XXIX). 
addition a lateral curved bundle on each side bending towards the median 
one near the apex of the lamina (Fig. 8, PI. XXIX, and Text-fig. 4, lc 2 ). 
