814 SEED-STRUCTURE OF RAFFLESIACEH AND HYDNORACES. 
sides, but the thickening is confined chiefly to their side and 
inner walls, which are likewise perforated with a number of slender 
branched radiating pore-channels, with a round cross section. 1he 
outer wall remains thin, and the cavity is now always full o 
an opaque, homogeneous, dark reddish-brown substance. ’ 
T 
a single integument, and at the bas funicle there is & 
number of irregular scale-like appendages, which may perhaps 
compared to the chalazal swelling in Raffesia and the outer coat- 
ing of Apodanthes. Hofmeister was the first to thoroughly investi- 
gate its structure and development. It matures into a small oval 
seed,* having a hard, brittle, straw-coloured testa, consisting of 
polygonal flattened cells, strongly thickened all around, and 
furnished 
oval form. The first ayer or stage contiguous to the embryo st 
wall consists of much smaller cells than the others, and ma aie he 
the embryo-cord. The second and third stages are usually 
outer face of a square cell is turned upwards so that the line of 
cells. Fig. 12 best illustrates what we Have just dese “ay 
all th have under consideration prese ne 
close relationship in regard to the structure of their s; but W 
we come to treat of the Brownian group of Hydnoracea, we cane 
They . yd 
(fig. 15) on the pendulous placentas of the ovary. After having alt 
ra h 
* I received ripe seeds of this plant some time ago from Montpellier pean 
my friend Prof. Planchon. 
