288 
Kusäno, Further studies on Aeginetia indicä. 
dry state for two years. It has not yet been ascertained how 
long tbe germinating power can be kept intact in seeds kept moist. 
Tbis is a practically important matter in connection witb tbe pro¬ 
tection of tbe ciiltivated plants (Kusano, 1903), in case tbey sbould 
be invaded by tbis parasite. 
Embryo. 
Tbe embryo is microscopically small and enclosed in tbe 
endosperm packed witb starcb. In Order to take it in toto out 
of tbe endosperm tbe seed was treated a day or more witb a con- 
centrated solution of cbloralbydrate. If such a seed be gently 
pressed nnder tbe cover glass, tbe endosperm would escape easily 
from tbe testa, and tbe embryo from tbe endosperm. Tbe mature 
embryo tbus taken out consists simply of a few isodiametric 
parencbymatous cells of nearly equal size. It is somewhat oval 
in form witb its narrow end directed towards tbe micropbylar end 
of tbe seed. No morpbological differentiation into plumule, radicle 
or cotyledons being in visible, it represents, as it were, tbe younger 
Stage ^ of an embryo of a pbanerogamic plant. Optical section 
sbows tbat at most two but often a single row of cells in tbe 
direction of tbe long axis of tbe embryo is enclosed by tbe epi¬ 
dermal cells (Figs. 1, 2). Very simple as it may be in structure, 
still it is not difficult to point out botb tbe radicular and plumular 
ends in tbe embryo. Tbese become evident in a germinating seed; 
tbe narrow end, wbicb often consists of smaller cells, corresponds 
to tbe radicle, wbile tbe otber end represents tbe plumule. As a 
wbole tbe embryo of Aeginetia bas quite tbe same structure as 
tbat of Orohanche (Kocb, 1878; Smitb, 1901, p. 118). 
Seedling. 
It is a notewortby fact tbat in spite of a great similarity in 
structure of tbe seed in Aeginetia tbe mode of germination is very 
divergent. In Orohanche germination is brougbt about by tbe 
multiplication of cells in tbe embryo, so tbat a filamentous seedling 
of 1—2 mm in lengtb is tbe result. Botb ^ tbe radicular and 
plumular ends are seen to consist in longitudinal section of four 
rows of cells enclosed by tbe epidermis (Kocb, 1878, Figs. 17—19). 
Tbe connection of tbe seedling witb tbe bost is effected by tbe 
tip of tbe radicle. Tbe tip on coming in contact witb any bost 
sends out its epidermal cells in tbe form of papillae (Kocb,A883, 
p. 189), and tbe subjacent initial cells tben commence to proliferate 
and produce tbe tissue of tbe primary baustoriiim. In Aeginetia 
tbe cbanges are quite different. In tbe first place we can scarcely 
recognize multiplication of cells or longitudinal growtb in tbe 
seedbng before it finds out tbe proper bost, and in tbe second 
place tbe development of tbe radicular end is very cbaracteristic. 
Tbe first cbange tbat can be observed as tbe sign of germination 
consists only in tbat two or tbree large, byaline globular cells 
