Species: 
Cell body (150-)230-400(-650) μm long, (22-)30-45(-65) μm wide, 
L/W=(4-)5-8(-10); pyrenoids arranged in an axial row 
(Coesel & Meesters 2007).  
 | 
Closterium lunula var. biconvexum Schmidle (or C. lanceolata ?), 
cell body 260 μm long, 50 μm wide, L/W=5.2, 
x 400, x 640, Kami-takayanagi, Kisai town, Saitama Pref., Japan, June 2003 by Y. Tsukii
 50 μm
 100 μm
 150 μm; x 400 : 
 31 μm
 63 μm
 94 μm; x 640