348 
STRUCTURE AND LIFE HISTORIES 
noted in Chapter XVI, the thallus of a liverwort may be 
chopped fine and every isolated, intact cell will give rise 
to a new plant. 
Growing plants of the liverwort, Marchantia, isolated 
by the dying of older tissue develop new individuals; 
the tips of the leaves of the walking fern may strike root 
FIG. 255. Drosera rolundlfolia. Production of a young plant from the 
leaf of an older plant. 
and originate new plants (Fig. 122), the tips of stolons or 
runners (as in ferns, eel-grass, strawberries, etc.) may 
do the same (Figs. 257-259, and 123), isolated sterile 
branches and "innovation-branches" of Sphagnum moss 
become new individuals (Fig. 144), as may also the familiar 
tubers and bulbs (such as those of the potato and onion), 
