Cape Species of Passer ina, with some Notes on their Anatomy. 601 
outside the chief bundles and spread laterally under the outer epidermis. 
In surface view, in macerated preparations, the hypodermal fibres are seen 
wandering like hyphae between the bundles, taking an irregular course, 
growing apically and occasionally branching. Indications of similar apical 
growth were found also in the other species, where there is, however, no 
hypodermal sheath of wandering fibres and the palisade is continuous. 
6 . The seedlings of both species have juvenile leaves which are slightly 
concave but not grooved, and are glabrous, with a waxy bloom. The 
stomata are not raised but sunk, and most of the epidermal cells have thick 
mucilaginous inner walls, as in adult leaves of species of most genera of the 
Thymelaeaceae. 
7. The cotyledons of P. filiformis are convex above, have palisade 
tissue on the upper side, not as in the juvenile and adult leaves on the 
under side, and the stomata, though confined to the upper side, are neither 
raised nor sunk. 
