Gnetum africanum , with Notes on Gnetum scandens. 1113 
(TP, Text-fig. 9) ; the cell-walls of the ‘tent-pole’ are often thickened and 
lignified, to fit them for their supporting function (Fig. 8, PI. LXXXVI). The 
Text-fig. 8. Oldest ovule of G. africanum. Endosperm and adhering nucellar cap from 
which integuments have been removed by dissection, about twice natural size, nc = nucellar cap ; 
PC = remains of pollen chamber; TP = tent-pole; dp => lignified cells in basal projection of endo¬ 
sperm ; c = paths made by pollen tubes. 
Text-fig. 9. Diagram of median longitudinal section through seed of G. africanum. c = 
outermost covering; 0 = outer integument; I = inner integument; F = fused nucellus and inner 
integument ; e = corrugated endosperm; tp = tent-pole ; NC = nucellar cap ; s = closed micropyle ; 
R = down-growing flange of micropylar tube. J 
cells of the nucellus in this region have thick lignified walls and form a sort 
of nucellar cap 1 (NC, Text-figs. 8 and 9) which, being attached at its base to 
1 Griffith, 1859, p. 303, Taf. LV, Figs. 25 and 26 ; Coulter and Chamberlain, p. 383, Fig. 430. 
