196 MISS WINIFRED SMITH ON THE ANATOMY 
agrees with Payena Leerii in the venation of the cotyledons, the transition from stem 
to hypocotyl, ‘and the orientation of the vascular bundles. The tetrarch root-structure 
is found about 1 mm. below the node in a specimen measuring about 20 mm. from node 
to root-apex. I found no thickened zone and saw no foliar traces in the hypocotyl 
(Pl. 26. fig. 19). Mimusops Schimperi has the peculiarity of showing two accessory 
bundles near the root-apex besides the usual four. In other respects it agrees with 
M. Elengi and M. Kauki (text-fig. 10). 
In Chrysophyllum Cainito also there is a general agreement with the type. The 
cotyledons are more bulky and the endosperm thinner. The embryo is less mature in 
the ripe seed. In the six seedlings examined no zone of thickening like that in the 
hypocotyl of P. Leeríi was seen. The smallest of these measured 6:5 mm. from node 
to root-apex, the largest 145 mm. The latter was thickened throughout. Root- 
characters were observed in the primary groups up to the node, so that the transition 
An aN — 
o e ; 
Cmm M, 
a 
SIZ Qs men 
8 mm. above apex of root. 3 mm. below node. 6 em. below node, 
near apex of root. 
\ 
CY 
e CN 
4 
ee 
Pa 
Palaquium petiolare. —A. Mimusops Schimperi. 
takes place in and above the node. The protoxylem only becomes internal at the base 
of the cotyledons. The whole of the outer halves of the double bundles go off in the 
cotyledons as lateral veins, and the midrib is thus formed by a fusion of the two inner 
halves; not, as in Payena Leerii, of these and of parts of the outer halves also. 
Chrysophyllum Roxburghii is also in general agreement. The embryo shows no xylem 
except at the distal end of the cotyledons. These are thinner than those of C. Cainito 
and the endosperm is bulkier. In the seedling root-structure is found close up to the 
node as in C. Cainito. A zone of the axis about 1 cm. deep and about halfway between 
the node and the root-apex was considerably enlarged, but the internal structure 
included no secondary thickening, only lignified parenchyma which reduced the pith to 
half its diameter (P1. 26. fig. 17). 
Chrysophyllum oliveforme has a smaller seed than the other species I have examined 
| ofthe genus. Tracheids only appear in the upper half of the cotyledons, in the embryo 
of the ripe seed. Latex is first seen near the surface of the cotyledons which abuts on 
the endosperm. The anatomy of the seedling agrees with that of P. Leerii, but, in à 
specimen measuring 8 cm. from node to root-apex and with a shoot 1 em. above the 
