PLATE XXIV. 



Nitelhpsis obtusa J. Groves. 



FIG. 



1. Plant, natural size, from Norfolk Broads. 



2. Young whorl. X c. 8. 



3. BrancUet-node with antheridium. X c 10. 



4. Branchlet-node with oogonium. X c 10. 



5. Apex of oogonium with coronula. X c. 30. 



6. Oospore. X c. 20. 



7. Stelliform bulbil. X c. 4. 



8. Do., further enlarged. X c. 8. 



