1) Fragile branching stoneworts 2) Genus nitella 3) Genus of stoneworts 4) Protoctist genus 
Nitella is a genus of alga in the family Characeae. == Species == Some species in the genus include: ...
Characean alga that has giant, multinucleate internodal cells. These show cytoplasmic streaming at rates of up to 100 m/sec and have been used as models for motile phenomena in cells and in studies on ionic movement. ... (18 Nov 1997) ... 
Characean alga that has giant, multinucleate internodal cells. These show cytoplasmic streaming at rates of up to 100 m m/sec and have been used as models for motile phenomena in cells, and in studies on ionic movement.
[n] - fragile branching stoneworts
genus Nitella noun fragile branching stoneworts