JoC's picture

Polysiphonia elongata thallus

Observed: 20th September 2013 By: JoCJoC is knowledgeable about PlantsJoC’s earned reputation in PlantsJoC’s earned reputation in Plants
Polysiphonia elongata thallus
Polysiphonia elongata cells
Polysiphonia elongata cortication

Original post 26.9.13. Red Seaweed on Preston beach
Tag edit 20.12.14

Species interactions

No interactions present.


dejayM's picture

pretty good

Origin 27th Sept 2013
As well as your obvious expertise and pretty good pictures, there's a wealth of Web-evidence. Example -
P.elongata also appears the Sesearch book as Elongate Siphon Weed, is well described and has a micro-photo, mimicking part of P3 - what more for an agreement? Nowt!
I love the 'cells' picture but where are they, in the whole and how do I separate them? (briefly!)
I have just embarked on the interstellar journey of low power microscopy and have clean and healthy seaweed pastures just outside my garden - watch out!
EDIT - removed my rude comment! (you'll have to guess what it was)

JoC's picture

cutting sections

The 'cell' pictures are cross sections of the stem and I use a razor blade to cut very thin sections. These are needed for ID in the the Polysiphonia as the first question in the key is 'periaxial(=pericentral) cells 4? or 5 or more?
Is that what you meant by 'where are they in the whole and how do I separate them?'


dejayM's picture


Origin 27 Sept.2013
Yes, thanks..
ð (apprentice)
Much later -
What a nice post, well up to the demanding criteria set in the Project.
Please tag it MarineA1 - and let's hope it will immediately appear in the project.
ð (no longer an apprentice but.....)
and PS thanks. I had to renew the Tag in the Project before it would Upload - a small bug then.
Not many of us appreciate your note in Description - I ðo.