Invasive SpeciesDasysiphonia

Dasysiphonia japonica
NOT FOUND by Moss Boss
Cape Elizabeth
ID Confirmed
Quality checked by self
Peer reviewed by
Field Notes
A quart sized bag of various filamentous red algae was collected at the water line. That sample was then taken back to our lab to be checked under a microscope by a team of teachers. We are preparing to examine a bunch of samples brought up by Maine DMR's fall suction survey. There were many different types of algae but we were mostly interested in finding Heterosiphonia japonica - an invasive red algae.
Supporting Evidence
Photo of my evidence.
Unlike the suspected HJ in our sample, this algae has heavier, multi celled branches. That rules out H. japonica. The color is also more brown than the algae we thought was HJ. A little under half the sample looked more like this species.
Photo of my evidence.
Here you can see that the main branched and the side branches look similar to each other with multicell thickness and a sort of 'node' structure you might see in bamboo (though algae and bamboo are not closely related whatsoever) That is not like HJ at all.
Photo of my evidence.
With the naked eye you can see that this algae has a "bushier" texture that is less feathery. It also holds its shape out of water more than what we thought was H. japonica.
Species Observation: Species Looked For
Did you find it?: 
I think I did not find 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 43.559779 °
W -70.217053 °
Observation Site Information
A photo of our study site.
Coastal - Rocky intertidal
Trip Information
Kettle Cove
Trip date: 
Fri, 2015-09-18 09:28
Town or city: 
Cape Elizabeth
Type of investigation: 
Species Survey
Time of low tide: 
Fri, 2015-09-18 08:46


Hello Moss Boss,
Your data is really high quality! You are a very active vital signs poster and a true Moss Boss. Your photos and evidence are very excellent!

Thanks! I appreciate the compliment! I find that doing VS observations is a nice excuse to go outside for a walk... and help people out at the same time :) My favorite thing is seeing other people's data though. I'm always curious to see what is going on around Maine... even if it is sometimes sad (like no seastars in Kettle Cove).

Happy observing!