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".]

Click on a link to view the image; all images now open in a new window,
so you can have more than one open at once to compare them.
Close the window to return to this page.
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  



   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
Ardnave L.
Ard Catchment
R. Creran
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
  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
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
R. Yarrow
  Gomphosphaeria 1  2 3 colonial Cyanobacterium:cells usually seen as heart-shaped, in mucilage at the end of branching stalks. L. Tallant
  Gomphosphaeria aponina   1  2  3   4   Lower L.
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
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
  Gyrosigma attenuatum   1   Algarve,Portugal
  Gyrosigma ?spencerii   1 2   Algarve,Portugal


  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
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
  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
Loch Dhomhnuill
Loch an Eilein
Camphill resr.
R. Yarrow
  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


  Kirchneriella  1   2  3
colonial Chlorophyte: small, crescent- or comma-shaped cells in small groups within a mucilaginous sheath L.Gorm
Loch Gearach
  Kirchneriella aperta  1  
  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.
  Klebsormidium crenulatum  1  2   3 Ard Catchment
  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


  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
Gore Glen
R. Yarrow



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


John Kinross