Other Fresh Water Plants

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These are plants that grow in fresh water, such as in rivers, lakes and swamps. But this category excludes Rushes & Sedges, Lilies & Irises, Daisies and Ferns which have their own categories.

Other Fresh Water Plants

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JaneR

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Discussion

MazzV wrote:

20 Feb 2025

Great photos, JaneR!

I've been thinking of setting up a 'Terraquarium' for observing some of the local frogs, basically a glass tank, with back & front separated to a middling height, so that the back section has terrestial plants and the front is a water environment. That would work brilliantly for these types of photos.
Thanks for the references. Some interesting differences between the 2 plants depicted at sightings 4197436 and 4424808, though they share the same botanic name. I guess another illustration of that is Brassica oleracea which, as edible plants go, comes in all shapes, forms & sizes, from kale to brussels, cauliflower to broccoli; notwithstanding thousands of years of human influence in this example.

All the best Jane, and thanks for all your info, it's been great to 'meet you',

Cheers,

MazzV

Landoltia punctata

JaneR wrote:

20 Feb 2025

From what I can see of rootlets and venation, it looks like Landoltia punctata (also known as Spirodela punctata). True, it doesn't have a purplish underside but according to PlantNet the underside of Landoltia punctata is "often purplish". Thanks for effort in taking underside and rootlets. Observations (text) would have worked too (I should have made that clear). Here are two sightings (4197436 and 4424808: just put number into Quick Search) with ideas on ways to photograph rootlets.
"Duckweed" is a general term for Lemna, Landoltia, Spirodela and Wolffia.

Landoltia punctata

MazzV wrote:

20 Feb 2025

Hi JaneR,

Thank you for those suggestions, I've learnt more from those than I did trying to find out more about it independently. I've just gone to find some more lemna (the original lot has since disappeared!) So I've managed a few hopefully helpful close-ups, along your suggested lines. They were tricky beasts to separate & place for the exercise and I wasn't highly successful in doing that! I've just posted them so hope they provide the appropriate information.

Cheers,
MazzV

Landoltia punctata

JaneR wrote:

19 Feb 2025

this needs a bit more information to work out which of three possible genera this is.
Are you able to check the following:
Q: Is underside of the thallus green; occasionally purplish; or tinged red ?
Q: how many roots are dangling from each thallus: just 1; up to 12; or up to 18 ?

A clear close-up of thallus taken vertically from above would be a help too.

Landoltia punctata

JaneR wrote:

17 Feb 2025

i you can (perhaps other photos ?) count the number of leaves per whorl: a very useful character, helps to trim down to a few species, sometimes even just one ! .

Myriophyllum sp.