OF SOME SAPOTACEOUS SEEDLINGS. 197 
node, foliar traces were seen at the node on all four sides of the stele. These died out 
above the appearance of root-structure in the primary groups. A swollen zone occurs 
about halfway between node and root-apex, but only extends for about 5 mm., and 
tapers gradually above. Both lignified parenchyma and secondary xylem are present 
in this region. 
I had no seeds of Imbricaria coriacea. The seedlings had thin cotyledons anda bulky 
endosperm, and their radicles were, in three cases out of four, coiled in a spiral. They 
were in general agreement with the Payena Leerii type and had a well-marked zone of 
thickening. The flat cotyledons showed in transverse section a central vein larger than 
the others (which were numerous) and corresponding with external grooves on both sides, 
Table to show the main Features of the Species examined. 
| 
| es bu | Hypocotyl | Swollen Zone Cotyledons xod | pie see 
| | 
Payena Leer .......... tetrarch. md og tetrarch., present. | flat, sessile, epigeal. bulky. | midrib and 
E laterals. 
Achras Sapota ........ do. do. do. absent. do. do. do. do. 0. 
Bassia longifolia ...... do. do. do. present. | fleshy, petiolate. ? small and 
2 scattered. 
BN Vu. do. do. do. do. do. do, ? 
Mimusops Elengi ...... do. do, do. do. thin, sessile, epigeal. | bulky. | midrib. 
oa aaa ee i hexarch.| do. do. do. do. T do. do. 
BE uui. tetrarch do. do. do.slight. do. do. ? present. do. 
Chrysophyllum Cainito .. do. do. do. absent. thick, sessile, epigeal. ^ do. do. 
ERATO -..1.1.:... do. do, do. present. | flat, sessile, epigeal?| bulky. do. 
C. oliveforme ........ do, do. do. do. do. do. a do. do. 
Imbricaria coriacea ....| do. do. do. do. thin, sessile,  ? do. do. 
Bumelia tenax ........ hexarch, do. do. absent. | fleshy, petiolate, very small and 
: olyare ypogeal. slight. scattered. 
Palaquium petiolare ....| hexarch, hexarch,  hexarch, present. | hemispherical, petio- ? do, 
heptarch.| heptarch. heptarch, late. 
B | octarch. 
Palaquium . drca el hexarch.| hexarch.| hexarch.| do. do. do. ? do. 
NEL uS o d 
SUMMARY. 
l. A swollen zone in the hypocotyl, corresponding with a band of secondary thickening, 
or with lignification of the pith, or with both, is seen in ten out of the fourteen species 
examined, Phloem is well developed. Other geophilous features are prominent in 
umelia tenax, 
2. The vascular system of primary root and hypocotyl is typically tetrarch and 
corresponds with two bundles from each cotyledon without change of position. In 
Mimusops Schimperi, however, there is a hexarch root, and Bumelia tenax and two species 
of Palaguium are variable and anomalous, tending to be hexarch. The occurrence of 
s hexarch type might lead one to suspect that a céntral cotyledonary trace had aborted 
dm tetrarch type, as described in some species of Diospyros by Mr. Herbert Wright *. 
ut in the tetrarch types of which I had seeds I could not discover, even in the embryo, 
* Loc. cit. (cf. post, p. 199). 
SE 
Tb SERIES.—BOTANY, VOL. VII, 25 
