Identify that alga:
Web-based key to genera -14: attached, sheathed colonies with chloroplasts

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filaments

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branched
+chloroplast
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unbranched
+chloroplast
(search4)
 
 
Colonies and coenobia
+chloroplast
(search10)
planktonic,
with sheath  
(search11)
planktonic,
without sheath  
(search12)
 attached
cushion
(search13)
 attached,
 flat plate
(search13) 
attached,
sheath
(search14)
 
 
Colonies and coenobia : Cyanobacteria
(search21)
planktonic,
with sheath
(search21)
 
 
 
 
 
Unicells

(under development)
 + chloroplast(s)
(search31)
(under development)
Desmids

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non-flagellate cells
without case
(under development)
 in silica case
= diatoms
(under development)
flagellate cells

(under development) 
 
 
  

no chloroplast:
Cyanobacteria
(search31)
 
  
 
 

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  Attached, in a sheath   Click on the thumbnail for a larger image
     
 

sheath sac-like, cells with pseudocilia extending through the sheath

  
  [Pseudocilium = flexible , but not motile, projecting fibre]
 

(a) colony normally attached at 1 end

  
  Apiocystis
 

(b) colony attached, or planktonic

 
  Tetraspora?
     
 

cells spherical; single or in groups of 2,4,8 in a mucilage sheath; each cell has 1 or 2 long pseudocilia. Has cyanelles rather than chloroplasts, but it is hard to see their shape.

  
  Gloeochaete
       

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John Kinross