Invasive SpeciesDasysiphonia

Dasysiphonia japonica
NOT FOUND by RedRiots5
Gulf of Maine
ID Confirmed
Quality checked by Claire j
Peer reviewed by Claire j
Field Notes
We analyzed sample 7a for the dasysiphonia monitoring project on November 2, 2015, and it was collected on 10/19/15. It's location was N 43.0873 W -70.6560, at a depth of 16 feet.
Supporting Evidence
Photo of my evidence.
This species is not Dasysiphonia because this sample has thousands of circular cells along its branches and thallus, whereas Dasysiphonia species branches are one-cell thick and in neat rectangular rows.
Photo of my evidence.
This sample is not Dasysiphonia because thallus of my species is much bigger than the invasive species. There is also no destinctive break between the main branch and the side branches like there is in Dasysiphonia.
Photo of my evidence.
My species is not Dasysiphonia because the branches are completely different. This sample has short, thick branches and structure, whereas Dasysiphonia species has a long thin structure and branches.
Species Observation: Species Looked For
Did you find it?: 
I think I did not find it
Scientific name:
Dasysiphonia japonica
Common name:
Sampling method: 
Quadrat (user-placement)
Photo of our sampling method.
Place Studied
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Map this species
N 43.087300 °
W -70.656000 °
Observation Site Information
A photo of our study site.
Coastal - Rocky intertidal
Trip Information
Dasysiphonia Project
Trip date: 
Mon, 2015-10-19 12:30
Town or city: 
Gulf of Maine
Type of investigation: 
Species Survey
Time of low tide: 


Beautiful photos too! This is why I love microscopy.... :)

Did this one have a almost spongy texture to it? I think this is the same stuff that I've found in the past and it is quite lovely to look at, even without a microscope. I wonder if we'll figure out what it is some day.

Happy observing,

No, it actually felt more like rubber and it was thin :)

Oh, neat! I'll keep an eye out for it then.

Thanks for sharing!

Lovely, possibly native seaweed? I noticed that all of the other RedRiots samples contained Dasysiphonia japonica. Were you surprised NOT to find this species? Any ideas why your area might not have Dj?

When we were looking through our sample we pulled it apart looking for DJ because everyone else in our class found it in there sample. We were positive we did not find it which I guess is a good thing, but was surprising.

Wow, yes, this does look completely different from Dasysiphonia japonica. Nice photos RedRiots5!

We were absolutely positive this wasn't DJ, all of the reds we found in are sample had millions of cells thoughout the branches and body. Glad you like the photos :)