REGENERATION IN LOWER PLANTS
131
(days)
o 20Y
^
i
^
75
P
Q:
g W
O
O
£
5
20
40
60
80 th
basal
apical
CELL
NUMBER
FIG. 5a. Pteris vittata. Time necessary for beginning of regeneration of isolated single
cells. P, formation of a new protonema cell. R, rhizoid formation. Abscissa: cell number
from basal to apical in a series of isolated single cells. (Redrawn from Ito, 1962.)
o
o
{^)
200
100
30
60
9 0
30
20
10
th
basai
apical
UJ
o
a:
CELL
NUMBER
FIG. ob. Pteris vittata. Length of the filamentous part ( · ) and number of cells in a
prothallium ( o ) 5 days after regeneration of isolated single cells. Abscissa: cell number
from basal to apical in a series of isolated single cells. (Redrawn from Ito, 1962.)