Invasive SpeciesDead man's fingers

Codium fragile
NOT FOUND by Marine2
Cape Elizabeth
ID Confirmed
Quality checked by Marine5
Peer reviewed by
Field Notes
Today, I am happy because my team and I didn't find our seaweed species. This is a good thing because this species is invasive, meaning it's not native and shouldn't be spotted near our coast anyway. I see the waves of the ocean and it's extremely gray, cloudy, and rainy outside. I smell the salt water, I hear the waves of the ocean and the drizzling of the light rain. I also smell the seaweed and wet ground that surrounds me. I'm very surprised that we didn't find this species because it's not even supposed to be here. It's invasive so it's not unlikely that we don't see it.
Supporting Evidence
Photo of my evidence.
The first evidence photo is not of codium fragile because even though the growth pattern of the species we found was the same as codium fragile, the thallus cross section was flattened with midrib, not round.
Photo of my evidence.
Codium fragile has a dichotomous growth pattern, this species does not. Also, this specimen has bubbles, while codium fragile, does not.
Photo of my evidence.
This specimen has a round thallus cross section, but the growth pattern was not the same as codium fragile. Also, the specimen had stringy growths off the stock, codium fragile has no growths like this.
Species Observation: Species Looked For
Did you find it?: 
I think I did not find it
Scientific name:
Codium fragile
Common name:
Dead man's fingers
Sampling method: 
Quadrat (user-placement)
Photo of our sampling method.
Place Studied
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Map this species
N 43.560000 °
W -70.210000 °
Observation Site Information
A photo of our study site.
Coastal - Beach or dune
Trip Information
Kettle Cove
Trip date: 
Tue, 2011-09-20 09:31
Town or city: 
Cape Elizabeth
Type of investigation: 
Species Survey
Time of low tide: 
Tue, 2011-09-20 10:49


I heard that you returned to the Kettle Cove area. Did you collect any data using quadrat sampling? Did you see any deadman's fingers on your outing?

Nice work in the rain. In your third evidence description, you mention that your seaweed specimen had a round cross-section. Did you tear a piece in half and examine the cross-section or did the seaweed feel flat?
In the third photo, I noticed the interesting growth on the seaweed. Do you think that this is a "normal" part of this seaweed or another seaweed that has attached to it?

You make an EXCELLENT case while also showing off the diversity of native algae species at your study site.