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fresh Pond (brackish), Stratford, Connecticut.

On stipes of Alaria fistula, Unalaska, Alaska.

On shells, stones etc., at low water mark, sometimes slightly mixed with A. crenulata, but mostly confined to a higher zone. Key West, Florida.

On shore at low water mark, South Harpswell, Maine.

On sandy bottom in half a meter water at low tide, associated with Penicillus capitatus and Halimeda triens, Key West, Florida.

On old Laminaria, Newport, Rhode Island.

On somewhat sandy bottom in 6 dm. water at low tide, Key West, Florida.

Cast ashore in entangled masses, Unalaska, Alaska.

On rocks, lowermost litoral zone, Unalaska, Alaska.

floating, Jupiter Inlet, Florida.

On Codium tomentosum, at low water mark, Anastasia Island, Florida.

On attached Sargassum pteropleuron, usually floating at surface at low tide, Key West, Florida.

Lying loose among plants, on mud, at high water mark, Cape Rosier, Maine.

On Helminthocladia purpurea, San Pedro, California.

In dense tufts, floating Mattapoisett, Massachusetts.

Forming a pale green sediment in water of a pool above high water mark, but reached by the spray, Pemaquid Point, Maine.

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

On a muddy shore, near high water mark, Mettepoisett, Massachusetts.

On bark of piles, Blake's Point, Maine.

On perpendicular and overhanging rocks, Marblehead Neck, Massachusetts.

In a gutter, mixed with other Cyanophyceae, Berkeley, California.

In slightly brackish water, in pond by Penn's Cove, Whidbey Island, Washington.

Warm Sulphur Springs, Banff, Canada.

On mud by roadside, La Conner, Skagit County, Washington.

In a greenhouse, Mount View Cemetery, Oakland, California.

Floating on a small pond near Penn's Cove, Whidbey Island, Washington.

Forming a turf, one cm. thick, on rocks just below low water mark, Key Wesy, Florida.

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

In fresh water rivulet, Farralone Islands, California.

In pale, short, silky, light yellow tufts, on smooth rocks wet with spray from cascade, Unalaska, Alaska.

In a stream, San Leandro, California.

On moss and grass, side of rill, Unalaska, Alaska.

On a dripping water pipe, Seattle, Washington.

On partially dry cow dung, in shade, Berkeley, California.

Among Spirogyra, etc., in pool in old slate quarry, Somerville, Massachusetts.

In a water trough fed by a spring, San Juan Island, Washington.

In pool, Warm Sulphur Springs, Banff, Canada.

On stones at low water mark, outlet of fresh water brook, but within influence of tide, Cape Rosier, Maine.

Forming blood-red gelatinous patches on smooth, wet, vertical rocks, Cascades, near Illiliuk, Alaska.

On woodwork of old tide mill, So. Harpswell, Maine.

Forming blackish-brown felt-like mats in shallow running water, Unalaska, Alaska.

In swampy place by roadside, Melrose, Massachusetts.

In salt marsh, Whidbey Island, Washington.

In a pond, Oak Bay, Victoria, British Columbia.

In pond, Whidbey Island, Washington.

Forming soft and slippery dense tufts in rapid water, South Harpswell, Maine.

In rocky pools, lower litoral, Marblehead, Massachusetts.

In pool in slate quarry, Sommerville, Massachusetts.

Forming a coating on sloping rocks, exposed to the full force of the surf, Pemaquid Point, Maine.

In pool near Illiluik, Alaska.