Bui. 1417, U. S. Dept. of Agriculture 



PLATETIO 



Longitudinal Sections of Fibrous Rootlets at the Junction with 

 the Taproot of Alfalfa 



A, A well-developed weft of hypha? and the hyphal wedge invading the cork cells (X 116). 

 B. A somewhat later stage, shewing how the hyphae spread out after the wedge pushes 

 through the cork cells. Note also how the hyphae become differentiated as soon as this 

 occurs (X 119) 



