Identify that alga:
Web-based key to genera -2: Filaments

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filaments

(search2)
branched
+chloroplast
(search3)
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

(searchdesmid)
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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  FILAMENTS   Click on the thumbnail for a larger image
 

Unbranched

 

Branched

 

UNBRANCHED FILAMENTS

 
 

cells in a single series (filament uniseriate)

 
 

cells in more than one series (filament multiseriate)

  Schizomeris
 

Uniseriate

 
    Chloroplast absent (cyanobacterium)*
    Chloroplast an axile band or plate
    Chloroplast a parietal band (circles round periphery of cell)
    Chloroplast(s)disc-shaped
    Chloroplast stellate (star-shaped)
    Chloroplast a dense network*
    *If the chloroplast shape is not distinguishable, there may not be one, or it may be too dense: check all possibilities further  
         

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John Kinross