| County | Township | Location | Institution | Year | Month | Day |
| Sagadahoc | Phippsburg | Bates-Morse Mountain Conservation Area, Phippsburg, ME | University of New Hampshire - Macroalgal Collection (NHA) | 2007 | 9 | 22 |
| Sagadahoc | Phippsburg | Morse Mountain Road on Sprague River marsh, Phippsburg, ME | University of New Hampshire - Macroalgal Collection (NHA) | 2007 | 9 | 22 |
| Lincoln | Alna | Sheepscot River at Sheepscot Road and Dyer Neck Road, Alna, ME | University of New Hampshire - Macroalgal Collection (NHA) | 1997 | 7 | 18 |
| Sagadahoc | Woolwich | Preble Point, at junction of Kennebec and Sasanoa River (Rt. 127-Rt. 1 bridge), Woolwich, ME | University of New Hampshire - Macroalgal Collection (NHA) | 1995 | 10 | 29 |
| Sagadahoc | Woolwich | Sasanoa Point, at junction of Kennebec and Sasanoa Rivers (Rt. 127 and Rt. 1 bridge), Woolwich, ME | University of New Hampshire - Macroalgal Collection (NHA) | 1995 | 10 | 29 |
| Lincoln | Nobleboro | Oyster Creek, within Salt Bay, Nobleboro, ME | University of New Hampshire - Macroalgal Collection (NHA) | 1995 | 8 | 14 |
| Sagadahoc | Bath | North Bath boat ramp, Kennebec River at Washington Street, ME | University of New Hampshire - Macroalgal Collection (NHA) | 1995 | 8 | 12 |
| Lincoln | Alna | Sheepscot River Reversing Falls area, South Alna, Alna, ME | University of New Hampshire - Macroalgal Collection (NHA) | 1995 | 7 | 19 |
| Lincoln | Newcastle | Sheepscot Reversing Falls area, Newcastle, ME | University of New Hampshire - Macroalgal Collection (NHA) | 1995 | 7 | 19 |
| Lincoln | Nobleboro | Oyster Creek, Salt Bay, Nobleboro, ME | University of New Hampshire - Macroalgal Collection (NHA) | 1995 | 6 | 16 |
| Sagadahoc | West Bath | Morse Cove boat ramp, i.e. Kennebec River, West Bath, Maine | University of New Hampshire - Macroalgal Collection (NHA) | 1994 | 8 | 12 |
| Sagadahoc | Bath | North Bath boat ramp at Washington Street, on the Kennebec River, Bath, ME | University of New Hampshire - Macroalgal Collection (NHA) | 1994 | 8 | 12 |
| Knox | Warren | Brooklyn Bridge on St. George River, just above dichotomy of Mill River, off of Brooklyn Height Road, Warren, ME | University of New Hampshire - Macroalgal Collection (NHA) | 1994 | 8 | 6 |
| York | Kennebunk | Kennebunk River at Durrel's Bridge, between Route 35 and Old River Road, Kennebunk, ME | University of New Hampshire - Macroalgal Collection (NHA) | 1994 | 7 | 11 |
| Lincoln | Nobleboro | Oyster Creek causeway, northwest side of Salt Bay, Nobleboro, ME | University of New Hampshire - Macroalgal Collection (NHA) | 1994 | 6 | 15 |
| Lincoln | Damariscotta | Beolw bridge on bottom debirs. Damariscotta River | University of Maine Herbaria (MAINE) | 1965 | 4 | 3 |
| Hancock | Bar Harbor | Thunder Hole, Mount Desert Island, Acadia National Park, ME | University of Massachusetts - Amherst (MASS) | 1953 | 8 | 26 |
| Hancock | Southwest Harbor | Mouth of estuary, near Sea Wall, Mount Desert Island | University of Michigan (MICH) | 1953 | 8 | 25 |
| Sagadahoc | Phippsburg | Fort Popham | The New York Botanical Garden (NY) | 1880 | 8 | 0 |