Invasive SpeciesDasysiphonia

Dasysiphonia japonica
FOUND by joe_rw
ID Confirmed
Quality checked by go science
Peer reviewed by
Field Notes
I personally did not go to the field but my teacher did and brought the samples back to the classrooms. It was low tide and it was rocky with lots of seaweed. The samples that my teacher brought back was left outside and frozen by the cold weather. We had to let it thaw for a day but then it started to decompose. It let out a revolting smell and everything was covered in a clear slime from the algae. When we found Dasysiphonia there was about three other people who look at it and also thought it was Dasysiphonia in my class. In the other classes they also found what they thought was Dasysiphonia and were able to confirm it amongst themselves.
Supporting Evidence
Photo of my evidence.
This proves that I found because it shows the multi celled to single celled branches, it also shows the shepherds hooks and finally it shows the axial growth.
Photo of my evidence.
This is a closer image that shows the multi celled to single cell branches. You can clearly see the main multi celled branch and the single celled secondary branches coming off the main branch with no pattern showing the axial growth. You can also see the shepherds hook which is part of the reproductive system.
Photo of my evidence.
This shows the shepherds hook and the multi celled to single cell. You can see the multi celled main branch with multiple single celled branches coming off of it.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Dasysiphonia japonica
Common name:
Sampling method: 
Just looking around
Photo of our sampling method.
Place Studied
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Map this species
N 43.751921 °
W -69.864700 °
Observation Site Information
A photo of our study site.
Coastal - Rocky intertidal
Trip Information
Water Cove
Trip date: 
Sat, 2018-01-27 12:30
Town or city: 
Type of investigation: 
Species Survey
Time of low tide: 
Sat, 2018-01-27 13:09


Great photos!

Hi joe_rw,

Great detailed observation! We want to make sure that you have the right date. Was January 27 the day the sample was taken from Water Cove, or was that the day you made your observation? Please respond to this comment with the correct date (when the sample was taken), and we'll fix it right away.


The VS Team

Hi VS Team

January 27 was day the sample was taken from Water Cove


Hi joe_rw,

Thank you for clearing that up! We wanted to make sure since the date was so much later than the observations that other students from Bath have been posting. Did your teacher go out and collect this sample herself? Keep up the great work!

~VS Team


Your photos - especially the first one - clearly show important diagnostic features for Dasysiphonia.

Thanks for your help in monitoring this seaweed,
Matt Bracken