dejayM's picture

Sea Lace

Observed: 20th June 2013 By: dejayM
Biological Recording In ScotlandHighland Biological Recording GroupOrkney Biodiversity Records Centre
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Can be confused with Himanthalia elongata which can have a lot of similarities
(I changed the ID twice before deciding)
Picture four is taken at a different time and in a different location,
Core Edit
I have removed picture 1 as it was, actually, Chorda filum (I'm as sure as I can be!!)

Species interactions

No interactions present.


dejayM's picture

good enough but..

Your opinion should be good enough for me Trudy.
But I had read and read that H.elongata was strap-like (flattened).
And, AND I read this "...using a small discoid holdfast.." here
and similarly here
"..the holdfast is disc-shaped..".
I am old enough to know that the internet is not the best place for these things.
But to top it all, the lovely Seasearch book is clear about holdfasts in both cases - one (C.filum) "..on discs.." the other (H.elongata) "starts as small green globules"

Lastly my pictures show no branching - only bifurcation near the base.
So - SHOULD I agree with you?

trudy-russell's picture

Hi Derek, sorry for the delay

Hi Derek,

sorry for the delay I have been in mcz planning world!

Please don't just take my word for stuff I am learning just as much as you are and have only started taking on seaweeds in the past year. I was confident about the difference until your reply so have had a look in various places.

The buttons in the forth picture could definitely be himanthalia see pictures here The picture in the seasearch book is very early development. What I cant find is any pictures of the holdfast of chorda!

I am still convinced however I have had a good look and can see a couple of branches either side of the 20p piece.

At the weekend I took photos of both in the same sites see and have a look and compare your photos I think the fronds look more like my thongweed photos but mine are taken in the water

Hope this helps

Trudy Russell
Marine Advisor
Natural England

To find out about what's going on in the south west check out

JoC's picture

Holdfast of Chorda filum
The holdfast is relatively small compared with H. elongata buttons.


dejayM's picture


Trudy and anyone else who comes here.
I really HOPE that I've made amends via the two postings here -