Index

Alphabetical list of algal images (no thumbnails, for fast loading), with brief descriptions.
[NB. IDs have been checked against "The Freshwater Algal Flora of the British Isles":
however some older IDs using "How to Know the Freshwater Algae" (Prescott) do not appear in FAFBI, and are marked "Prescott".]

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Other pages (eg. see links to images sorted by genus) have thumbnail images and descriptive notes.

A   B   C   D   E   F   G   H   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Z  

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G      

   Geminella 1   2   3   4   5  6  7  8  9 filamentous Chlorophyte:cells usually in pairs within a mucilage sheath, with a parietal band chloroplast. Hidden Lochan
SCO330
Ardnave L.
Ard Catchment
R. Creran
Millport
R. Yarrow
 
   Glaucocystis 1 Eucaryotic cell with blue-green cyanelles (normally ribbon-shaped) instead of chloroplasts. Lower L. Glenastle
       
  Gloeocapsa 1   2 colonial Cyanobacterium: cells in a lamellate mucilage, growing attached to surfaces
SCO067
SCO330
 
  Gloeocystis 1  2  3 4 5  6? 7 8 9 10  11 12

Gloeocystis vesiculosa   1  2  3  4 5  6  7  8  9
colonial Chlorophyte: oval or spherical cells in concentrically layered mucilage, chloroplast cup-shaped. Shewington
Kindrogan pond
SCO366
SCO330
L.Gorm
Kilchiaran lochan
R. Creran
 
  ?Gloeotila subconstricta  1 filamentous chlorophyte Loch Gearach
       
  Gloeotrichia   1
colonial Cyanobacterium: tapering filaments with a basal heterocyst, attached to surfaces, vegetation, etc., forming a subspherical tuft SCO172
 
  Gomphonema acuminatum  1  2 3 Diatom: elongated cells, attached to surfaces by a branched stalk, cells broader at distal end. Shewington
R. Yarrow
  Gomphonema subtile  1 R.Yarrow
  Gomphonema truncatum 1 2  3  4 Shewington
SCO140
R. Yarrow
 
  Gomphosphaeria 1  2 3 colonial Cyanobacterium:cells usually seen as heart-shaped, in mucilage at the end of branching stalks. L. Tallant
L.Gorm
  Gomphosphaeria aponina   1  2  3   4   Lower L.
Glenastle
Ardnave L.
Lily Loch
 
  Gonatozygon kinahanii  1  2  3 4  5 filamentous Desmid: elongated cells usually in pairs joined end-to-end, ends slightly swollen, cell surface decorated, chloroplast axile. Millport
L.Conailbhe
R. Creran
  Gonatozygon monotaenium   1 2  3 4 SCO140
Lochan an Daimh
Lower L.Glenastle
Lily Loch
 
  Groenbladia neglecta  1 filamentous Desmid  
       
  Gymnodinium aeruginosum   1 Pyrrophyte with blue-green cyanelles Loch Gearach
       
  Gyrosigma acuminatum 1  2  3  4  5   6  7  8  Diatom: sigmoid, tapering shape L.Gorm
Algarve,Portugal
Bemersyde
  Gyrosigma attenuatum   1   Algarve,Portugal
  Gyrosigma ?spencerii   1 2   Algarve,Portugal
 

H       BACK TO TOP

  Haematococcus  1 2 3 4 5 6
unicellular Chlorophyte: common in bird-baths; green or red flagellate cell in vegetative state, but forms red spherical cysts when the habitat dries out. Shewington
 
  Hannaea arcus 1 2 Diatom: banana-shaped frustule with capitate ends.
Douglas Water
 
  Hapalosiphon 1 2 3 4 filamentous Cyanobacterium: main axis has branches arising at right angles, cells blue-green, sometimes forming more than 1 series; sheath may be darkened SCO172
SCO076
L. Chon
 
  Haplotaenium minutum 1 2 Desmid: straight baton-shaped cell with a median constriction but no basal inflation (unlike Pleurotaenium), 1 ridged chloroplast in each semicell L. Chon
 
  Heterococcus viridis  1 filamentous Xanthophyte: branched filament, cells with numerous bright green plate-like chloroplasts SCO379
 
  Homoeothrix    1 2 3 4 5 6 7   filamentous Cyanobacterium: sheathed, tapering trichome, false branching, no heterocysts (cf. Tolypothrix) SCO076
 
  The genus Hormidium , with descriptive notes filamentous Chlorophyte: long unbranched filaments which tend to kink frequently: cells square- to long-cylindric with a (usually) disc-shaped chloroplast which wraps round about half the cell circumference and nearly as long as the cell, otherwise very similar to Ulothrix.  
  Hormidium (Klebsormidium) 1 2  3  4  5  6  7   8 Comer Burn
L. Ard
L.Chon
  Hormidium subtile  1 Ardnave L.
     
 
  ?Hormotila mucigena   1  2  3  4  5  6 filamentous Chlorophyte: cells at the end of or at intervals along the length of branching mucilage tubes; the tubes may be featureless or show layering. Chloroplasts net-like: this is not evident in these pictures. greenhouse
 
  Hyalotheca dissiliens 1   2   3   4   5   6  7  8 9 filamentous Chlorophyte (Desmid):cells have a median incision, giving the filament an uneven appearance: single stellate chloroplast; the filament can sometimes be seen to have a wide mucilage sheath with radiating fibrils. Stac Pollaidh
Hidden Lochan
SCO366
Loch Dhomhnuill
Loch an Eilein
Camphill resr.
R. Yarrow
R.Creran
  Hyalotheca mucosa  1 R.Creran
 
  Hydrodictyon  1  2 3  4 : inspiration for the 'Algal Web' colonial Chlorophyte: cylindrical cells are linked at each end to 2 others to form a net-like structure; each cell grows larger and eventually a smaller net forms inside. Bemersyde
Craiglockhart pond
 

K       BACK TO TOP

  Kirchneriella  1   2  3
colonial Chlorophyte: small, crescent- or comma-shaped cells in small groups within a mucilaginous sheath L.Gorm
Loch Gearach
Millport
       
  Kirchneriella aperta  1  
  L.Staoisha
 
  Klebsormidium (Hormidium) 1   2  3   4   filamentous Chlorophyte: long unbranched filaments which tend to kink frequently: cells square- to long-cylindric with a (usually) disc-shaped chloroplast which wraps round about half the cell circumference and about as long as the cell, otherwise very similar to Ulothrix.
cultures
  Klebsormidium crenulatum  1  2   3 Ard Catchment
Galloway
       
  Korshikoviella mikhailovskoensis   1  2  3  4 Spindle-shaped green cell, frequently attached at one end with a spine at the other, with a segmented chloroplast. Dunfermline SUDS
 

L       BACK TO TOP

  Lemanea 1   2   3   4   5   6   7   8   9   10  11 filamentous Rhodophyte: grey, olive-green or brown in colour, multiseriate, branching may be infrequent, but filaments are tapering with swollen nodes at intervals. Cells angular with disc-shaped chloroplasts. Meldons
Traquair
Gore Glen
R. Yarrow
       
 

Lyngbya

 

Lyngbya aestuarii 1  2  3  4  5  6  7 

filamentous Cyanobacterium:sheathed, unbranched, no heterocysts, forms hormogonia (short filaments) which can escape from the thin sheath and may show motility. cf Oscillatoria: motile but no sheath, and Phormidium: sheaths form a mat. Trichome (filament not including sheath) colour ranges from olive green to brown or black; sheath colourless or brown when older.
L. aestuarii is a brackish-water species: the examples shown came from water with a salinity value of 9.
(cf. seawater = salinity ~35)
Algarve, Portugal
 


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John Kinross