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  




Desmidium swartzii  1  2 3


filamentous Desmid: cells are triangular in end view with a notch in side view, cells joined at a slight angle to each other so that the third corners form a spiral. SCO366 Camphill resr.

?Diadesmis sp.  1

filamentous Diatom: rectangular cells joined side-by-side forming a ribbon.
Kindrogan Pond
  Diatoma ehrenbergi 1 filamentous Diatom: rectangular cells joined at the corners by mucilage pads forming a zig-zag colony. Ends capitate R. Yarrow
  Diatoma vulgaris   1   2 filamentous Diatom: rectangular cells joined at the corners by mucilage pads forming a zig-zag colony. Not capitate. Douglas Water
R. Yarrow
  Dicellula 1   2   3   Chlorophyte: coenobium of 2 ovoid cells joined along long axis, with many long spines; parietal chloroplast(s) Green Lochan
  Dichothrix  1   2   3   4 filamentous, colony-forming Cyanobacterium: false-branching taperiing filaments with basal heterocysts in a yellow-brownish sheath, ending in multicellular hairs. Differs from Calothrix in that it may have many filaments in a common sheath. SCO172
Kilchiaran L.
  Dichotomococcus  1   colonial Chlorophyte (coenobium): cells are united by mother cell-wall remnants in a mucilage sheath. Cells elongated, spindle-shaped. Loch Gorm
  Dictyosphaerium  1  2 3  4 colonial Chlorophyte (coenobium): cells in multiples of 4 towards outside of a mucilage sheath. The spherical cells are at the ends of dichotomously branching threads, with cup-shaped chloroplasts. Loch Gorm
L. Conailbhe
  Dictyosphaerium pulchellum  1   2 Loch Uigedail
  Didymosphenia geminata 1   2   3   4
Diatom: attached to surfaces by stalks, with the cells in pairs; cf. Achnanthes and Gomphonema, but cells much larger, a distinctive shape, and with clearly visible markings on the frustule. Kindrogan Pond
R. Yarrow
  Dinobryon  1   2   3
colonial Chrysophyte: cells in flask or funnel-shaped loricas forming a branched colony: flagella visible in fresh material. Loch Skeen
Loch Chon
Loch an Eilein
  Diplostauron sp.  1 flagellate Bemersyde
  Dispora   1 (Prescott) colonial Chlorophyte: oval cells in irregular groups of 4, forming a flat plate - (possibly Crucigenia ?) Shewington
  Draparnaldia  1   2   3 filamentous Chlorophyte (Chaetophorales): branched, with main axes a larger diameter than the short, tufted branches which arise from main axis cells. Branches end in pointed cells, or hairs when phosphorus is scarce. Chloroplast is a parietal band. Loch Skeen


  Ellerbeckia arenaria  1 Diatom:forms chains of large cells R. Creran
    Diatom:cells with a curved dorsal and more or less straight ventral margin, can be solitary, motile, but frequently found in mucilage tubes. Frustule markings fairly readily visible  
  Encyonema caespitosum  1 Douglas Water
  Encyonema minutum 1 R. Creran
  Encyonema prostratum   1  2 R.Yarrow
  Encyonema silesiacum   1 Loch Fada
  Enteromorpha sp. 1 2 3 Branched filamentous Chlorophyte: macroscopic filaments forming hollow tubes, characteristic of nutrient enriched marine/brackish water Ravenglass
Craiglockhart Pond
  Epithemia sp.  1 Diatom: Loch Chon
  Euastrum: desmid, cell composed of 2 symmetrical semicells with relatively flat aspect in face view ( polar view elliptical).
Compare with Cosmarium, which lacks an apical notch.

  Euastrum ansatum   1 2   Loch Gorm
L. Conailbhe
  Euastrum bidentatum   1 2  3 4     SCO172
Loch Skeen
L. Conailbhe
Lower L. Glenastle
  ?Euastrum binale v. gutwinski   1     L. Tallant
  Euastrum crassum   1 2 3   SCO172
Loch Chon
  Euastrum denticulatum  1 2  3    L. Ruime
L. Chon
  Euastrum didelta   1  2   L. Skeen
Loch Trool
  Euastrum dubium  1  2   L. Conailbhe
Kilchiaran L.
  Euastrum elegans   1  2     SCO172
L. Conailbhe
  Euastrum inerme   1   L. Chon
  Euastrum insulare   1  2   L. Conailbhe
Loch Trool
  Euastrum insigne   1  2    Beinne Sholum
Loch Trool
  Euastrum oblongum   1  2  3   L. Fada
L. Conailbhe
R. Creran
  Euastrum pectinatum 1   SCO140
  Euastrum pinnatum  1 2   Loch Trool
  Euastrum verrucosum 1   2   3   4  5   SCO172
L. Gorm
L. Chon
Lower L.Glenastle
Loch an Eilein
  Eucapsis alpina  1 2 3 4 5  6 7  8 colonial Cyanobacterium: spherical cells in groups of 4 in a cubical arrangement within a colonial mucilage. L. Gorm
Ardnave L.
L. Chon
  Eudorina   1 2 3 4  5
colonial Chlorophyte (flagellate): spherical / oval colony with round cells slightly separated; 2 flagella from each cell projecting through mucilage sheath. Colony motile in a tumbling, rolling motion. Shewington
L. Gorm
L. Chon
  Euglena acus 1 unicellular Euglenophyte: flagellate cell with variable shape. Bemersyde
  Euglena oxyuris 1  2 Bemersyde
  Euglena tripteris 1  2 Bemersyde
  Euglena viridis  1  2  3 4
Benhaar bing
  Eunotia bilunaris 1 2 Diatom: rectangular in girdle view; narrow, curved in valve view; various shapes, attached to surfaces or to each other by mucilage pads. SCO067
  Eunotia flexuosa 1 R. Creran
  Eunotia minor 1 2 Shewington
Stac Pollaidh
  Eunotia robusta  1 L. Ruime


  Fragilaria sp.  1  2  3  4  filamentous Diatom: cells linked by valves to form long ribbons. SCO067
R. Creran
Millport resr.
Yarrow Water
  Fragilaria capucina  1  2  3  4   Yarrow Water
R. Creran
  Fragilariaforma virescens   1 2  3  4   5 Diatom:rectangular in girdle view, may form chains R. Creran


John Kinross