Invasive SpeciesDasysiphonia

Dasysiphonia japonica
FOUND by saltyslippers
Cape Elizabeth
ID Questioned
Quality checked by Kristina M
Peer reviewed by ninjacrabs
Field Notes
We started our search for Asian red algae for the Vital Signs research program at 9:15 am. It was a cloudy, windy day with hints of blue sky in the distance. I saw the ocean, the beach, lots of seaweed, tide pools, and people. I smelled salt from the water. I felt sand, seaweed and rocks. Some problems I ran into were: the seaweed was slippery so it was a little bit hard to search for what we were looking for. Also, it was windy, our specimen and the piece of paper it was on, continually flew away. I was surprised at how much Asian red algae was there. The Asian red algae is all over the beach.
Supporting Evidence
Photo of my evidence.
This picture shows that the algae's growth pattern is axial (all branches come off of a main stem), not dichotomous (meaning split into two parts), which can help distinguish this species from other species of algae. The species is hair- like and feathery to the touch. According to the species Asian red algae ID card from Vital Signs, the species has a round thallus cross section (where two branches come together) where most other species have a flattened cross section.
Photo of my evidence.
This picture is taken on the shore. When Asian red algae is under water, it appears reddish brown. When washed up on the shore, the Asian red algae appears reddish pink. Asian red algae is also very bushy under water or when dry. This is a common feature of the Asian red algae. This is not another algae because lots of other algaes have green colors, for example, Dead man's fingers.
Photo of my evidence.
This picture shows the single celled side branches and the stem that is multiple cells thick. Also, as pictured Asian red algae has a round stem. Τhese are signature features of Asian red algae according to the Asian red algae species ID card from Vital Signs. The cell stucture of Asian red algae can help distinguish this species from look-a-like red algaes.
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 43.560482 °
W -70.217335 °
Observation Site Information
A photo of our study site.
Coastal - Beach or dune
Trip Information
Kettle Cove Cape Elizabeth
Trip date: 
Tue, 2014-10-28 09:08
Town or city: 
Cape Elizabeth
Type of investigation: 
Species Survey
Time of low tide: 
Tue, 2014-10-28 08:25


The hooks on the branches suggest Bonnemasionia, not Dasysiphonia.

Nice job getting those microscope photos! I'm really curious what the species expert thinks it is.

Happy observing and thanks for posting,