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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  Tabellaria fenestrata var. asterionelloides  1  2  3  4 Diatom: colonial/filamentous, attached to each other by mucilage pads at the corners to give stellate or zig-zag colonies; valves linear, sometimes inflated in the centre, but cell usually seen in girdle view, square or rectangular with obvious septa (long ribs extending up to half way across the cell) L. Skeen
  Tabellaria fenestrata var. fenestrata  1 L. Skeen
  Tabellaria flocculosa 1   2  3 L. Skeen
  Tabellaria quadriseptata 1  2 L. Conailbhe
L. Ballygrant
  Teilingia granulata  1 2  3 4  5 Filamentous "Saccoderm" desmid, consisting of small, cosmarium-like cells linked by 2 button-like protrusions. Kilchiaran L.
L. Conailbhe
L. Dhomhnuill
R. Creran
  Tetmemorus brebissonii  1 Desmid Loch Trool
  Tetmemorus granulatus 1   R. Creran
  Tetracyclus lacustris 1 chain-forming diatom Millport
  Tetraedriella polychloris  1 Xanthophyte Lily Loch 
  Tetraedron caudatum  1 unicellular Chlorophyte, 5-sided, deeply indented; with marginal processes armed with spines Kilchiaran L.
  Tetraedron minimum  1   2  3 unicellular Chlorophyte, 4-sided, marginal processes armed with 1-5 teeth Kilchiaran L.
  Tetraspora  1 2 colonial Chlorophyte: spherical cells in a gelatinous sac, with pseudocilia extending through the sac.
  Tetraspora gelatinosa  1 2  3 4 cells in 4's or 2's. Pseudocilia not visible in these images
Physgill, Galloway
  Tolypothrix  1 2 3 filamentous Cyanobacterium: trichome not tapering, cells in a thich sheath (often brown), showing false branching with a heterocyst at the base of the branch. Stac Pollaidh
Lower L.Glenastle
  Tortitaenia luetkemuelleri 1   2 "Saccoderm" desmid, cylindrical tapering at both ends (spindle-shaped). Chloroplast with spiral ridges (cf. Spirotaenia which has a spiral chloroplast) L.Chon
  Trachelomonas 1 unicellular flagellate with a flask-shaped lorica Bemersyde
  Tribonema 1   2  3  4 5 filamentous Xanthophyte: cells usually slightly swollen in the centre, with walls consisting of H-pieces (cf. Microspora), multiple disc chloroplasts. Shewington
Loch Allan


  The genus Ulothrix , with descriptive notes

filamentous Chlorophyte: unbranched, attached by holdfast cell (cells near holdfast usually narrower than those further along), single parietal band chloroplast, complete or incomplete, occupying 80% or more of the cell surface; no mucilage  
  Ulothrix 11Ám.  1  2 Glencorse
  Ulothrix 14Ám.   1  
  Ulothrix 14Ám. sporulating  1  
  Ulothrix 32Ám.   1  2  3 R. Creran
  Ulothrix 48Ám.  1 Douglas Water
  Ulothrix 70Ám. 1   2   3 R. Ardle
  Uronema  1  2  3 filamentous Chlorophyte: unbranched, attached by holdfast disc, terminal cell swollen / pointed; chloroplast Ulotrichoid. Shewington




  Vaucheria   1  2 3  4 5  Branched filamentous Xanthophyte, filament a coenocytic tube (no individual cells), with numerous small chloroplasts, and specialised structures for sexual reproduction. Grows subaerially forming a felty mass on damp surfaces (river banks, etc.) Shewington
  Volvox   1  2  3  4 
Colonial Chlorophyte; flagellate cells forming a hollow spherical colony with cells spaced out from each other.


  Wolozynskia tylota 1  flagellate Pyrrophyte Kilchiaran Lochan
1  2  3  4   5  6  7   8  9   10  11   12
colonial Cyanobacterium: oval cells in spherical mucilage; concentrated in outer layer, each with a stalk (just visible in images 2 and 3). Hard to distinguish from Coelosphaerium if stalks can't be seen. (10: showing stalks; 11: cells squeezed out under pressure)
Lower L.Glenastle
Ardnave Loch


  Xanthidium 1   2
unicellular Desmid: semicells dorsoventrally flattened without lateral incisions, with marginal spines and a central process. Green Lochan
L. Skeen
  Xanthidium antilopaeum  1   2   L. Tallant
L. Skeen
  Xanthidium antilopaeum v. depauperatum   1 2  3 4   L. Chon
Camphill resr.
  Xanthidium antilopaeum v. hebridarum 1  2 3  4   Lower L.Glenastle
R. Creran
L. Ballygrant
  Xanthidium armatum 1   Loch Trool
  Xanthidium cristatum 1  2  3  4   L. Tallant
Lochan an Daimh
L. Gearach
  Xanthidium octocorne  1   L. Conailbhe
  Xanthidium subhastiferum  1   L. Shiel


  Zygnema 1   2   3 filamentous Chlorophyte: unbranched; cylindrical cells with 2 stellate chloroplasts; undergoes conjugation - without finding zygospores it is not possible to distinguish species, also possibility of confusion with Zygnemopsis (and Zygogonium). Islay
Zygnema 20Ám. 1  2  3
L. Chon
Ardnave Loch
  Zygnemopsis desmidioides 1   2 filamentous Chlorophyte: unbranched, cells long-cylindric with rounded ends, axile plate chloroplast, 2 pyrenoids. Other species of Zygnemopsis are indistinguishable from Zygnema except for their zygospores.
L. Skeen
  The genus Zygogonium filamentous Chlorophyte: unbranched. At first glance it may appear like Microspora, as the cells can look bulbous or barrel-shaped, and the ends of filaments appear H-shaped, but the filament does not break up to release H-pieces and there are 1 or 2 stellate chloroplasts; the cell wall can be thick and chloroplast shape hard to see.  

Z. ericetorum  1   2  3  4  5  6  7  8  9  10  11  12   13


L. Uigedail


John Kinross