PLATE XIV. 

 Nitella tenuissima Kutzing. 



FIG. 



1. Plant, natural size^ lax form, from near Mullingar, 



Westmeath. 



2. Plant, natural size, compact form, from Wicken Fen, 



Cambridgeshire. 



3. Branchlet. x c. 10. 



4. Portion of branchlet showing secondary, tertiary, 



quaternary and quinary rays, x c. 20. 

 5-10. Apices of dactyls, x c. 40. 



11. Oogonium, x c. 40. 



12. Coronula. x c. 200 (after Migula). 



13. Oospore, broad view, x c. 40. 



14. The same, viewed edgewise, x c. 40. 



