STEUCTURB AND DEVELOPMENT. 



41 



ii and iii). They vary greatly in shape, being irregu- 

 larly lobed, the lobes rounded in outline and often 

 very numerous, the whole bulbil sometimes measuring 

 more than 6 mm. in its longest diameter. 



The bulbils of G. delicatula are very similar to those 

 of G. fragifera, but are smaller and less frequent. 

 They are usually produced at the lowest stem-nodes. 

 In G. baltica, besides the bulbils of the strawberry type. 



Pio. 14. — i. Enlarged node of underground stem of Chara dilicatula, 

 showing rudimentary whorl of branchlets and numerous starch- 

 bearing cells, ii. Longitudinal section of enlarged stem-node of 

 the same. Both after Kuczewski. ( x u. 24.) 



i. e., those having rounded lobes. Dr. Giesenhagen 

 finds some of a somewhat different type, with more or 

 less acute lobes, their shape being due to several 

 divergent outgrowths of rows of large cells surrounded 

 by smaller ones, producing an irregularly star-shaped 

 process (Fig. 13 i). It is diflBcult to draw any 

 definite line between the multicellular stem-bulbils and 

 the enlarged lower stem-nodes which occur in many 

 species, and which fulfil the same function. Fig. 14 

 shows an enlarged stem-node, in which while stipulodes 



