RHIZOIDS OF THE HORNWORT 



89 



Guppy found that the shoots were mostly killed by five or six 

 days inclusion in ice. 





B 



FIG. 58. Ceratophyllum denier sum, L. 

 A, single leaf of a rhizoid. B, single 

 leaf of a water shoot (Enlarged.) 

 [After Gluck, H. (1906), Wasser-und 

 SumpfgewAchse, Bd. n, Figs. 27 A 

 and B, p. 195.] 



FIG. 57. Ceratophyllum demersum, L. 

 Part ot an axis, A , which is lying on 

 the soil and bears a normal leaf- 

 whorl, B, and a rhizoid penetrating 

 the soil. The lowest leaf -whorl of 

 the rhizoid, U, has transition leaves. 

 (Slightly enlarged.) [After Gluck, H. 

 (1906), Wasser-und Sumpfgewachse, 

 Bd. II, PI. VI, Fig. 76.] 



The various peculiarities of structure and habit to which 

 we have referred in the preceding pages, are not the only 



