March, 
- 86 The Botanical Gazette. [Mare 
others may be seen to form tracheids which are thus 
ous to the elater cells of Hepatic The latter ee 
the one observed in Casuarina glauca and C. —_ 2 ee e ie 
3. Twenty macrospores nee pe these elong 
he greater axis of the nucellus. 
. Ghecoy lr ends of the macrospores a 
three small cells which are to be considered as hom a 
with the canal-cells of the Eu-archegoniata and not Fe 
gide. Generally only one of the macrospores has pier 
endowed with a cellulose wall and this cell is 
embryo-sac. 
organs. . . 
3 A large number of endosperm nuclei are formed a 
the embryo is developed, thus indicating again the si ee 
of these cytogenetic sequences to those of the Gymnosp 
Archisperme). er 
7 eanarie is therefore believed to occupy a dco 
anomalous position among the Metasperme (Angios Fine 
It is nearer to the Archisperme than any form yet ie highet 
and may be given a place apart from the rest a eee e 
seed-plants. Treub proposes the following classifica 
geeag is re- 
admit Casuarina to its proper place, as indicated by hi 
searches: 
Archisperme, iki tir a 
Chalazagamee :: Casuarina. 
Metaspermze P = Dicotyledonee. 
orogamee :: | Monccotyledanal 
. - ? : out 3° 
Casuarina, the only genus of its family, contains about 9 
species. The 
Australasia. A very 
