412 



It can survive getting dry during summer (Rosenvinge, Norman); 

 in sucli cases its leaf-segments become oval in transverse 

 section. 



This species appears to occur especially frequently in 

 Greenland, Iceland, northern Scandinavia and Finland (Gelert). 



С В 



Fig 50. Bafrachium confervoides. 



J., Base of nectary-leaf with nectary (Greenland; 12/1). B, Portion of the transverse section 



of a stem (Iceland; ^"li). ep, Epidermis; c, cortex; I, lacuna; s, collapsed tissue. C, Apex 



of leaf with hair and water-stomata (Iceland; ""/i). D^ Transverse section of segment 



of an aquatic leaf (Iceland; "°/i). E, The epidermis of an aquatic leaf (Iceland; ^"/i). 



Anatomy. The adventitious roots which arise upon the 

 ascending stems resemble in structure those of the examined 

 species of Ranunculus. The epidermis and the exodermis are 

 suberized; the former shows a tendency to collapse, the latter 

 has slightly-undulating radial walls. The greater part of the 

 coxtex breaks down at an early stage. The endodermis is 

 suberized. The central cylinder is diarch; the woody masses 

 are not in contact with each other. — Mycorrhiza was absent. 



