PLATE XV. 



Nitella hatrachosperma Braun. 

 Fia. 



1. Plant, natural size, from I. of Harris, Hebrides. 



2. Branch, x c. 20. 



3. Fruiting branchlet. x c. 30. 



4. Branchlet-node with antheridium and young oogonium. 



X c. 60. 

 5, 6. Apices of dactyls, x c. 150. 



7. Oogonium. X c. 60. 



8. Oospore, x c. 60. 



9. Membrane of oospore, x c. 375. 



