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Off Butler's Point, Wood's Hole, Mass., on rocky bottom at depth of three or four meters.

On rocks, Chondrus, etc., near low water mark, Port Jefferson, Long Island, N.Y.

On Zostera marina, Revere Beach, Mass.

On rocks at low water mark, Butler's Point, Wood's Hole, Mass.

Floating off the south shore of Cuttyhunk Island, Mass.

On Fucus vesiculosus, just below low water mark, Wood's Hole, Mass.

On stones and earth in water flowing from a spring, Ithaca, N.Y.

Washed ashore in large, entangled masses, Wood's Hole, Mass.

Floating in clay pits, Medford, Mass.

Mostly on aquatic mosses in summer and autumn, in quiet water, Pequonnock River, Bridgeport, Conn.

In company with other species of algae forming a scum on pools and ditches, Middlesex Fells, Mass.

Middlesex Fells, Mass.

At first forming gelatinous sheaths on Zostera, Ruppia, etc., afterwards floating masses, in warm water of tidal basin, Goose Cove, Cape Rosier, Maine.

On stones at the water's edge, usually in company with Dichothrix, etc., Suntaug Lake, Peabody, Mass.

Forming black gelatinous tufts on Ascophyllum nodosum, Wood's Hole, Mass.

Forming extended patches on mud left bare at low tide in the bottom of a creek, Cold Spring Harbor, N.Y.

At and below low water mark, just within the entrance to the harbor, St. John's, Newfoundland.

On rocks overhung by Fuci, at low water mark, growing in dense tufts, near Sea Wall, Mount Desert Island, Maine.

In tide pools at low water mark, Newport, Rhode Island.

Dredged in one to eight meters depth, Penfield Reef, Long Island Sound, near Bridgeport, Connecticut.

On Ahnfeltia plicata Fries, growing between tide marks, Pacific Grove, California.

On stones and woodwork at low water mark, Monterey and San Francisco, California.

On stakes and wharf logs, Edgartown, Massachusetts.

Anastasia Island, Florida.

On vertical faces of rocks between tides, Pyramid Point, Pacific Grove, California.

Near New Haven, Connecticut.

Floating in a pond, Medford, Massachusetts.

In yellowish green, cloudy masses, in a small pond, Norwich, Connecticut.

Middlesex Fells, Massachusetts.

In shallow pool in the woods, Among fallen leaves, Orange, Connecticut.

Pine Banks Park, Melrose, Massachhusetts.

In a cold spring, just above high water mark, Eagle Island, Penobscot Bay, Maine.

Pine Banks Park, Melrose, Massachusetts.

In a ditch, Falmouth, Massachusetts.

Los Angeles, California.

On Laminaria saccharina, Newport, Rhode Island.

Growing in stalks of plants at low water mark, Jupiter Inlet, Florida.

Forming yellowish green masses, in a small brook, Foxon, Connecticut.

On small stones, just below low water mark, Edgartown, Massachusetts.

Floating in a pond, Falmouth, Massachusetts.

On grasses, etc., in a sluggish brook, Wakefield, Massachusetts.

Floating in a small pond, Wakefield, Massachusetts.

On grass, roots, etc., Pequonnock River, Bridgeport, Connecticut.

Bridgeport Harbor, Connecticut.

Moshassucks River, near Woodlawn, Rhode Island.

On old logs in a salt marsh, Eagle Island, Penobscot Bay, Maine.

On sides of rock pools, Marblehead, Massachusetts.

In stagnant pool, near Pasadena, California.

Forma confluens, on turf of Spartina roots, Charles Island, near Milford, Connecticut.

On Zostera, etc., Goose Creek marshes, Cape Rosier, Maine.