Algae
Lack of expertise means that the tables below only represents of some of the species that are present, and in some cases uncertainty is indicated by brackets and a question mark.
Below is a list of Algae, presented in alphabetical order. A photograph (where available) of a specimen found somewhere in the area may be viewed by clicking on the scientific name.
| Species | Common Name | Location |
| Achnanthes sp. | Diatom | Alexandra Lake 08/01/2018 |
| Achnanthes sp. | Diatom | Alexandra Lake 08/01/2018 |
| Ankistrodesmus gracilis (poss.) | Colonial alga | Perch Pond 18/04/2018 |
| Cladophora sp. | Green alga | Capel Road garden 09/11/2015 |
| Closterium sp. | Desmid | Alexandra Lake 08/01/2018 |
| Coelastrum sp. | Colonial alga | Capel Road garden pond, 09/04/2018 |
| Cosmarium sp. | Desmid | Harpenden Road garden pond 01/01/2018 |
| Cylindrocapsa (?) | Green alga | Capel Road garden pond 18/12/2017 |
| Cymatopleura sp. | Desmid | Harpenden Road garden pond 01/01/2018 |
| Cymbella sp. | Diatom | Harpenden Road garden pond 01/01/2018 |
| Desmidium sp. | Desmid | Harpenden Road garden pond 01/01/2018 |
| Diatom | Diatom | Alexandra Lake 08/01/2018 |
| Diatom | Diatom | Capel Road garden 01/12/2015 |
| Enteromorpha sp. | Gut Weed | Wanstead Flats, Jubilee Pond 13/07/2011; Wanstead Park, Heronry Pond |
| Eudorina sp. | Colonial alga | Perch Pond, Wanstead Park, 18/04/2018 |
| Euglena sp. | Euglena Flagellate | Harpenden Road garden pond 01/01/2018 |
| Euglena sp. | Euglena Flagellate | Capel Road garden, 29/03/2018 |
| Gonium sp. | Colonial alga | Perch Pond, Wanstead Park, 18/04/2018 |
| Gymnodinium sp. ? | Flagellate | Capel Road garden pond 27/12/2017 |
| Navicula sp. | Diatom | Harpenden Road garden pond 01/01/2018 |
| Nitzschia sp. | Diatom | Capel Road garden 29/11/2015 |
| Pediastrum sp. | Green Algae | Harpenden Road garden pond 01/01/2018 |
| Peridinium sp. | Flagellate | Capel Road garden 19/11/2015 |
| Phacus sp. | Euglena Flagellate | Alexandra Lake 08/01/2018 |
| Scenedesmus sp. | Green Algae | Harpenden Road garden pond 01/01/2018 |
| Scenedesmus sp. | Green Algae | Harpenden Road garden pond 01/01/2018 |
| Spirogyra sp. | Green Algae | Harpenden Road garden pond 01/01/2018 |
| Staurastrum (natator?) | Desmid | Harpenden Road garden pond 01/01/2018 |
| Staurastrum sp. | Desmid | Harpenden Road garden pond 01/01/2018 |
| Trachelomonas sp. | Euglena | Harpenden Road garden pond 01/01/2018 |
| Trentepohlia aurea | Green Algae | Bush Wood 07/11/2007 |
| Trentopohlia (abietina?) | Green Algae | St. Mary's churchyard, Wanstead 07/02/2016 |
| Ulothrix sp. | Green Algae | Harpenden Road garden pond 01/01/2018 |
| Ulotrichales (Order) | Green Algae | Harpenden Road garden pond 01/01/2018 |
| Volvox | Volvox | Capel Road garden 17/12/2017 |