PLATE XII. 



Nitella mucronata Miquel. 



1. Plant, natural size, from R. Ouse, Bedford. 



2. Apex of branchlet showing 2- and 3-celled dactyls. 



X c. 20. 

 3-5. Apices of dactyls, x c. 30. 



6. Fruiting branchlet. x c. 20. 



7. Oogonium, . x c. 40. ' 



8. Oospore, x c. 40. 



