628 Benson and Weis ford.- — The Morphology of the Ovule and 
appendicular but parietal and anatropous. With this conclusion we entirely 
concur — even though for purely descriptive purposes it may be convenient 
to call it basal and orthotropous. 
Possibly if we knew more of the phylogenetic history of the basal ovule 
in other families it might be equally clearly demonstrated that it admitted 
of the same interpretation. 
The Ovule. 
The placentation has already been dealt with in the previous paragraph. 
We wish now to discuss the integumentary structures, as they some- 
what resemble those of Myrica Gale , on which E. M. Kershaw 1 has 
made some interesting observations. In the first place we note that the 
nucellus is free from the integument, a character which, contrary to 
E. M. Kershaw, we regard as almost universal among Angiosperms. In 
the second place, although the integument appears single, there are 
indications of a dual origin. Judging from the almost universal presence 
of two integuments in Angiosperms 2 and from the fact that among the 
Amentiferae we find all stages from the two completely free integuments 
(e. g. in Fagaceae ) 3 to two more or less fused integuments (e. g. in 
Casuarinaceae and Corylaceae) 4 we feel justified in regarding the ovule of 
Juglans as bitegumentary. The integuments are however very nearly 
completely merged. 
Vascular Supply of the Ovule. 
Van Tieghem 5 not only accepts the dual nature of the integument but 
makes the following statement with respect to the distribution of the 
vascular supply ‘ Parvenu sous la base du corps de l’ovule, ce faisceau 
penetre dans la membrane externe sans envoyer aucune branche a la mem- 
brane interne ; le siege exclusif, en profondeur, du systeme vasculaire du corps 
de l’ovule est done la membrane externe.’ 
As in Myrica Gale y the placental strand on entering the ovule of Jtiglans 
gives rise to a number of bundles which lie symmetrically about the ovule, 
but the number is much larger than in Myrica. The number is approximately 
twenty and they appear to be as numerous in the rarer case where only one 
placenta feeds the ovule as where two placentae contribute. 
Crenate Form of Transverse Section of Micropyle. 
This phenomenon, which is not uncommon among the more primitive 
Angiospermic ovules, e. g. Rheum , reaches a remarkable development in 
Juglans regia. It occurs in young ovules before fertilization and is well 
1 E. M. Kershaw, The Structure and Development of the Ovule of Myrica Gale. Annals of 
Botany, 1909, p. 357 2 V. Payer, Organog&iie de la fleur ( undique ). 
3 Benson, Contribution to the Embryology of the Amentiferae, part i, Trans. Linn. Soc., 1894. 
4 Benson, Sanday, Berridge, Contribution to the Embryology of the Amentiferae, part ii, Trans. 
Linn. Soc., 1905, pp. 68 and 69, pp. 48, Plate 6. 
5 Van Tieghem, loc. cit., pp. 415-16. 
