| County | Township | Location | Institution | Year | Month | Day |
| York | Kittery | Seapoint Beach, Kittery, ME | University of New Hampshire - Macroalgal Collection (NHA) | 2015 | 10 | 1 |
| Cumberland | Freeport | Brewer's Marina, South Freeport, ME | University of New Hampshire - Macroalgal Collection (NHA) | 2013 | 8 | 8 |
| Cumberland | South Portland | Spring Point Marina, South Portland, ME | University of New Hampshire - Macroalgal Collection (NHA) | 2013 | 8 | 4 |
| Cumberland | Freeport | Brewer South Freeport Marine, South Freeport, ME | University of New Hampshire - Macroalgal Collection (NHA) | 2010 | 7 | 31 |
| Cumberland | South Portland | Dyer Cove, South Portland, ME | University of New Hampshire - Macroalgal Collection (NHA) | 2010 | 7 | 31 |
| Cumberland | South Portland | Spring Point Marina, South Portland, ME | University of New Hampshire - Macroalgal Collection (NHA) | 2010 | 7 | 31 |
| Sagadahoc | Phippsburg | Bates-Morse Mountain Conservation Area, Phippsburg, ME | University of New Hampshire - Macroalgal Collection (NHA) | 2007 | 9 | 22 |
| Cumberland | Freeport | Brewer South Freeport Marine, South Freeport, ME | University of New Hampshire - Macroalgal Collection (NHA) | 2007 | 7 | 28 |
| Cumberland | Portland | Portland Yacht Services, Portland, ME | University of New Hampshire - Macroalgal Collection (NHA) | 2007 | 7 | 28 |
| York | Kittery | Seapoint Beach, Kittery, ME | University of New Hampshire - Macroalgal Collection (NHA) | 2006 | 7 | 4 |
| Washington | Eastport | Estes Head, at Heritage Salmon Farm off of Broad Cove, Pen 2, ME | University of New Hampshire - Macroalgal Collection (NHA) | 2005 | 8 | 7 |
| Washington | Eastport | Harris Point, At Stott Sea Farms, Eastport, ME | University of New Hampshire - Macroalgal Collection (NHA) | 2005 | 8 | 7 |
| York | Kittery | near tidal rapids site off Seapoint Road, Kittery, ME | University of New Hampshire - Macroalgal Collection (NHA) | 2005 | 7 | 4 |
| Hancock | Winter Harbor | Schoodic Head, Schoodic Peninsula | University of North Carolina at Chapel Hill Herbarium (NCU) | 1979 | 9 | 5 |
| Cumberland | Cape Elizabeth | Cove near lighthouse, Two Lights, Cape Elizabeth | University of North Carolina at Chapel Hill Herbarium (NCU) | 1975 | 9 | 9 |
| Cumberland | Cape Elizabeth | Cove near lighthouse, Two Lights, Cape Elizabeth; 43.55805 -70.20843 | University of North Carolina at Chapel Hill Herbarium (NCU) | 1975 | 9 | 9 |
| Lincoln | Bristol | Below the lighthouse, Pemaquid Point; 43.866667 -69.516667 | University of North Carolina at Chapel Hill Herbarium (NCU) | 1975 | 9 | 4 |
| Hancock | Bar Harbor | Near Thunder Hole, Acadia National Park, Mount Desert Island, ME | University of Massachusetts - Amherst (MASS) | 1953 | 8 | 26 |
| Hancock | Mount Desert | Seal Harbor, ME | New England Botanical Club (NEBC) | 1889 | 24 | 24 |
| Knox | Saint George | Caldwell Island, Knox Co. | University of Maine Herbaria (MAINE) | 1888 | 7 | |
| Washington | Lubec | Comstock Point, at Cook Aquaculture raft, Seward Neck, North Lubec, ME | University of New Hampshire - Macroalgal Collection (NHA) | 0 | 0 | 0 |
| Cumberland | Brunswick | Wharton Point, Brunswick, ME | University of New Hampshire - Macroalgal Collection (NHA) | 0 | | |