1 126 
Notes . 
The aerial leaf also presents no distinctive features. It is bifacial, with one or 
two rows of palisade parenchyma, and four to six of spongy parenchyma. Stomata 
are found on both surfaces, rather more abundantly on the lower. Hairs of the same 
character as those on the stem are found on both surfaces, the large simple hairs 
being always sharply bent backwards towards the apex of the leaf. In the transition 
to the tooth-like subterranean leaves, the mesophyll becomes less in amount and the 
palisade parenchyma is no longer differentiated. The stomata and hairs become 
much less frequent, and, as in the subterranean stem, the simple hairs are here thin- 
walled and point in any direction. 
The root bears no root-hairs, which are seldom or never found on the roots of 
the Personate parasites . 1 The vascular bundle is diarch in structure; secondary 
thickening sets in very early. For figures showing the general structure of the root, 
those given by Hovelacque for the root of Melampyrum cristatum 2 may be consulted, 
as these show in all respects the same structure as that of Striga. I have been 
unable to demonstrate sieve-tubes in the root, though elongated parenchymatous cells, 
having the appearance of sieve-tube initials, are present. It is possible that these are 
sufficient for the purposes of translocation in the delicate tissues of the root, though 
of course it is equally possible that they may later on develop into sieve-tubes which 
have escaped notice. 
It will be seen that Striga in its anatomical structure shows a general resemblance 
to other members of the order, and a close resemblance to certain other members of 
the section Rhinanthoideae. Its most distinctive feature is the comparatively feeble 
development of mechanical tissue, which may be correlated with its small size and 
partially subterranean habit. 
EDITH L. STEPHENS. 
South African College, 
August , 1912. 
1 Hovelacque, loc. cit., p. 496. 2 Hovelacque, loc. cit., pp. 473, 475. 
