in Myzodendron punctulatum, Banks et Sol. 201 
may be fertilised, though only one embryo forms at all. The 
embryos have no suspensor. The placental embryo-sac tube 
is present before fertilisation, elongating afterwards, but not to 
the same extent as in Myzodendron. Guignard describes a 
fusion of two such tubes to give a common one descending the 
placenta, a phenomenon reminding one of Van Tieghem’s 
observation of Viscnm album. Guignard agrees with Van 
Tieghem as regards the appendicular nature of the placenta 
and its ovules. This view is not supported by Guignard’s own 
observation of The slum divarication , in which the floral papilla, 
after giving off sepals, stamens, and carpels, persists as a papilla, 
and as it becomes covered in by the carpels elongates, simul- 
taneously with the formation of the inferior ovary, to become 
the ovuliferous placenta. In this case the placenta appears to 
be axial in its origin. The egg-apparatus of Santalum album 
is, as described by Strasburger in his latest paper, normal. 
As the species observed by Guignard were, in the cases of 
The slum and Osyris , hitherto unexamined, and as the results 
obtained were, though much more complete, not specially 
different from those acquired by the previous examination of 
other species, it would seem that there is not such a great 
difference between species of the same genus in the Santalaceae 
as in the Loranthaceae (e. g. between Loranthus sphaerocarpus 
and L. pentandrus as examined by Treub). 
Mature Embryo. 
The mature embryo of Myzodendron punctulatum (Fig. 20) 
agrees in most of its features with that of M. brachystachyum 1 . 
There is no more peculiar embryo than that of Myzodendron 
known. The viscid tissue described by Sir Joseph Hooker in 
M. brachystachyum occurs in M . punctulatum too, in the same 
position. In addition to two very small consolidated coty- 
ledons the plumule shows a distinct projecting apex, beneath 
which, passing towards the radicular end, there is a well- 
marked procambial strand. The whole embryo is provided 
J. D. Hooker, op. cit. p. 301. 
