EUPHYCOPHYTA I53 



Structure, even though the growth is still confined to the apex, 

 marks the highest development of Church's consolidated or cable 

 type of construction. The cells of the cortex are smaller than in 

 other members of the family. The medulla comprises larger prim- 

 ary cells with smaller secondary hyphae interwoven among them. 

 The end cells of the assimilators often have a much-thickened 

 outermost wall. Branching of the axial threads is monopodial as in 

 Mesogloia. The oblong unilocular sporangia are borne at the base 

 of the assimilatory filaments, but plurilocular sporangia are un- 



Fig. 83 Chordaria divaricata. A, plant ( x §). B, apex of young 

 plants showing commencement of cortication. C, apex of older 

 plant of C flagelliformis showing structure of thallus. a =assimi- 

 lator. D, unilocular sporangia ( x 300). (A, D, after Newton i B, C, 



after Oltmanns.) 



