CURRENT LITERATURE. 475 
iated with a massive integument. In Houstonia the ovules have no 
nent, the archesporium becoming deeply imbedded by growth of the 
llar tissue. In the Spermacoceae an outgrowth derived from the funi-— 
; is described as a “‘strophiole,” and contains the vascular supply of 
ovule. Throughout all the forms the archesporium contains seven to 
cells, the larger numbers occurring among the Galieae. Each spore 
er cell forms the usual tetrad of four megaspores in linear series, but 
are there any walls. In some cases two or more megaspores begin to 
ion, sometimes in the same tetrad; ordinarily, however, the innermost 
spore of a central tetrad finally becomes the ‘single sheragas sac. The 
sas ten antipodals; while in other forms they are ephemeral. Among 
eae there is a remarkable suspensor, the cells elongating: laterally 0 or 
ST strocomes are to be found. In Crucianclla aid | Asperl, wine 
al features were carefully studied, the reduced number of Cescmaghe 
ten and twelve respectively ; but after counting a aie number of : 
writer believes that the number is not comma In Aspens? in = 
hase of the first division, the second ] splitt: ) 
is et ie evident. In Crucianella this beers takes 
Spore, are fheictnty pic. ‘Judged tot a pce oT 
which give rise to the row of four cells are true sami divisions, 
re spores. 
‘Memoir closes with a decerictie ok the bchation: - the pollen tube 
. Richardsonia, special stress being | laid — the determ 
of the _omee tube. a M ~ 2 4 
