966 Thoday and Ber ridge.- —The Anatomy and Morphology of 
The nucellus becomes very thin and papery in the seed, except at the 
apex, where it is still possible to distinguish the remains of the remarkably 
deep pollen-chamber, which has already been described in detail by other 
Text-fig. xi. 1-4. E. altissima ovule. 1. Longitudinal section showing general structure. 
N = nucellus ; Pr — prothallus ; pc = pollen-chamber ; ii = inner and oi = outer integument ; 
Muc. = mucilage ; fs = fibrous strand accompanying vascular bundle ; fl = fibrous layer on 
inner edge of outer integument ; P = papillae ; Mt — micropylar tube ; B = hypodermal tissue ; 
c = cup ; vb = vascular bundle ; tt = transfusion tissue. 2. Base of fused nucellus and inner integu- 
ment, showing sharp line of demarcation. 3. Transverse section through apex of micropylar tube, 
closed by hardened mucilage, and part of edge of inner integument showing lignified papillae attached 
to micropylar tube. 4. Free region of inner integument, showing coiled micropylar tube and 
reticulately thickened strengthening cells. 
authors 1 (Figs. 9 and 12, PI. LXXXV). In the seed of some species the walls 
of the cells surrounding the pollen-chamber become thickened and lignified, 
1 Strasburger, 1872, Fig. 54, Taf. XVI ; Jaccard, 1894 ; Land, 1904; Berridge and Sanday, 1907. 
