268 
Mac Dougal, 
as terrestrials were placecl in the water. Also cuttings including several 
internodes were tlirown into tanks in which they floated freely. The 
rejuvenescence of these cuttings was characterized by the development 
at first of two or three ovate, serrate leaves, which passed through 
dissected stages into the filamentous types (Fig* 5). If small cuttings 
were used the nepionic leaves were broadest, but were still not so broad 
Fig. 3. Mature leaf of Neobeckia of the terrestrial type. 
Fig. 4. Mature leaf of Neobeckia of the aquatic type. 
Fig. 5. Plantlet of Neobeckia from cutting floating freely in water. 
Fig. 6. Rejuvenation of small cutting of Neobeckia. 
as those of terrestrials in rejuvenescence (Fig. 6). The rejuvenescence 
of lateral buds attached to stems of some length was characterized by 
nepionic leaves which were still narrower, being oblong-linear, more or 
less remotely serrate, and passed quickly into the finely dissected type 
(Fig. 9). m 
In June 1912, a number of cuttings were made from the radish- 
like Underground members, which are probably a combination of roots 
