Invasive SpeciesHeterosiphonia

Dasysiphonia japonica
FOUND by jmiller33
Not Yet Reviewed by Expert
Quality checked by Jeremy Miller
Peer reviewed by
Field Notes
On about Christmas day, my next door neighbor, Gary Sredzienski - known as "The Creekman" - reported seeing considerable amounts of an orange-red plant over a wide area in Spruce Creek. He swims in Spruce Creek (and other spots in the region) at least 300 days per year. He reported never seeing this phenomenon before. I got him to bring in a specimen, which he did, and which appears to be Heterosiphonia japonica: heavily corticated main branches, 4-pericentral cells forming secondary branches, single-cell ultimate branches with no "lobster-claw" tips. It appears to match on-line photos of the species (and not other local Rhodomelaceae).
Supporting Evidence
Photo of my evidence.
microscope photos taken at Wells NERR. Sample may have been bleached by sun/preservative.
Photo of my evidence.
attempt at close up. Sample may have been bleached by sun/preservative
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Common name:
Scientific name:
Dasysiphonia japonica
Sampling method: 
Just looking around
Photo of our sampling method.
Place Studied
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Map this species
N 43.092427 °
W -70.720410 °
Observation Site Information
A photo of our study site.
Coastal - Mudflat
Trip Information
Spruce Creek, Kittery, ME
Trip date: 
Fri, 2017-01-06 09:22
Town or city: 
Type of investigation: 
Species Survey
Time of low tide: 
Fri, 2017-01-06 10:54
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