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On gelatinous filaments of Schizonema, in lower tide pool, Ragged Island, Casco Bay, Maine.

Among moss in small pools of water, North Berkeley, California.

Floating in small pond, Pine Banks Park, Melrose, Massachusetts.

In brook, Unalaska.

On grasses in pool above high water mark, Nahant, Massachusetts.

On stones, etc., in outlet of fresh water stream; in salt water for a short time each tide, at other times in running fresh water; Cutler, Maine.

On woodwork at extreme high water mark, under old tide mill, Harpswell, Maine.

On Fucus, Seaside Park, Bridgeport, Connecticut.

On stones, middle litoral zone, Land's End, San Francisco, California.

Fairhaven, Washington.

On rocks, middle litoral zone, Unalaska.

On stones, lower litoral zone, Unalaska, Alaska.

On Odonthalia floccosa, Unalaska.

On rocks, upper litoral, Western Head, Cutler, Maine.

Epiphytic on Desmarestia aculeata, west coast of Whidbey Island, Washington.

A low water mark, La Jolla, California.

In crevices of sea wall, litoral, St. Augustine, Florida.

At half tide level, La Jolla, California.

On rocks near low water mark, Jupiter Inlet, Florida.

On pneumatophores of the black mangrove (Avicennia nitida) near low water mark, Key West, Florida.

Forming a thick, stratified mass, warm sulphur spring, Banff, Alberta, Canada.

On sand-covered rocks of a jetty, litoral, Anastasia Island, Florida.

On rocky sides of a tide pool at high water mark, Cape Rosier, Maine.

Forming a very slippery but firm, brownish black stratum, and also scattered among other algae, warm sulphur spring, Banff, Alberta, Canada.

Not immersed, but forming gelatinous masses on steep bank above the shore, So. Harpswell, Maine.

Near Iliuliuk, Unalaska, Alaska.

On pebbles in rather shallow water, Suntaug Lake, Peabody, Massachusetts.

Pool near Bow River, Laggan, Alberta, Canada.

In rock pools at and above high water mark, Friday Harbor, San Juan Island, Washington.

In tide pools in rock at high water mark, Griday harbor, San Juan Island, Washington.

On Gymnogongrus Norvegicus, in tide pools, Bailey's Island, Casco Bay, Maine.

Floating on Lake Chabot, San Leandro, California.

Iluliuk, Unalaska, Alaska.

In outflow from a sulphur spring, Mt. Diablo, Contra Costa County, California.

In fresh water creek emptying into ocean, but water never other than fresh, San Leandro, Alameda County, California.

On ground damp with urine, Unalaska.

In running water, Pocasset River, Johnstown, Rhode Island.

In mill racke below Moody's Pond, Bridgeport, Conn.

On pebbles wet by spray of small waterfall, Spot Pond Brook, Virginia Wood, Middlesex Fells, Massachusetts.

In a viaduct, strictly fresh water, San Leandro, Alameda County, California.

Forming dense masses in rapid water of brook, Medford, Massachusetts.

In small pond near Tufts College, Medford, Massachusetts.

Newport, Rhode Island. Similar locality as 1076a [Growing below low water mark].

Growing below low water mark, Bridgeport, Connecticut.

In floating masses in pools, Ragged Island, Casco Bay, Maine.

On rocks between tide marks, ocean shore, St. John's, Newfoundland.

On rocks at low water mark, Grand Bay, near Channel, Newfoundland.

On shells, etc., St. Augustine, Florida.

Growing just below the water mark on ferry slip, Marblehead Neck, Massachusetts.

Growing at low water mark, Tortugas, Florida.