Landoltia punctata
Spotted Pondweed at suppressed
Identify this sighting
| Landoltia punctata | JaneR | 24 Feb 2022 | |
| Lemna disperma | Mike | 19 Feb 2022 |
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User's notes
Multiple roots.
4 comments
19 Feb 2022
The reliable way of distinguishing between Lemna and Spirodela, which are both tiny floating plants, is by checking the number of roots per thallus.
Lemna has 0 to 1, whereas Spirodela has 2 to 18 roots per thallus.
Less reliable (harder to apply consistently) is the number of plants in a group. Spirodela tend to form smaller groups (of 2 to 5 plants) whereas Lemna can form bigger groups (up to 10 plants).
The photo is not conclusive either way, but Lemna is plausible.
Lemna has 0 to 1, whereas Spirodela has 2 to 18 roots per thallus.
Less reliable (harder to apply consistently) is the number of plants in a group. Spirodela tend to form smaller groups (of 2 to 5 plants) whereas Lemna can form bigger groups (up to 10 plants).
The photo is not conclusive either way, but Lemna is plausible.
24 Feb 2022
Thanks @JaneR for the information on ID. I have added photos showing the multiple roots. Plants in groups of 2-5. Leaves purplish underneath. I can't distinguish veins.
24 Feb 2022
CNM lists Spirodela punctata (renamed) but NSW Flora Online lists Spirodela polyrhiza. Are they the same?
24 Feb 2022
great photo of the roots: a very nice addition to the sighting. This makes it a Spirodela (now known as Landoltia), rather than Lemna. PlantNet has Spirodela polyrhiza and Landoltia punctata.
it is relatively easy to check for the roots, if you have a stick and the plants are within reach: lift some out, and the roots are apparent draped over the stick.
it is relatively easy to check for the roots, if you have a stick and the plants are within reach: lift some out, and the roots are apparent draped over the stick.
Sighting information
- 1,001 - 10,000 Abundance
- Mike Recorded by
Collections
Species information
- Landoltia punctata Scientific name
- Spotted Pondweed Common name
- Highly Sensitive
- Local native
- Non-invasive or negligible
- External link More information
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Synonyms
Spirodela punctata
Record quality
Quality score
5 / 7
- Images or audio
- More than one media file
- Verified by an expert moderator
- GPS evidence of location
- Description
- Nearby sighting(s) of same species
- Additional attributes