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On rocks just below low tide mark, San Pedro, California.

Growing on various plants between tide marks, St. Augustine, Florida.

On rocks, shells, etc., Fresh Pond, (brackish,) Stratford, Connecticut.

On shaded rocks, High Ledge, Melrose, Massachusetts.

On a grassy bank, in sandy soil, Loch Raven, Baltimore County, Maryland.

Forming gelatinous tufts on rocks at the base of a dam, Pequonnock River, Bridgeport, Connecticut.

Growing in a fresh water stream, on the surface of a rock frequently washed by salt water, and in a storm practically submerged; Conanicut Island, Rhode Island.

On Codium tomentosum, Jamaica.

On the ground, Castle Point, Bermuda.

On clayey soil in damp Black-jack woods, Chester, South Carolina.

On rocks and epiphytic at about low water mark in The Narrows harbor of St. John's, Newfoundland.

On stone drinking fountain, Revere, Massachusetts.

On stones between tide marks and in pools, Bridgeport, Connecticut.

On stones in swift water, Pequonnock River, Bridgeport, Connecticut.

On Ruppia maritima etc., in a muddy salt marsh pool, Bridgeport, Connecticut.

In tide pools, Magnolia, Massachusetts.

In pools and on rocks, between tide marks, ocean shore, St. John's, Newfoundland.

In shallow ditches by the roadside, North Berkeley, Alameda County, California.

In quiet water, Felsmere, Malden, Massachusetts.

On Cladostephus, at low water mark, Newport, Rhode Island.

In standing water among other Algae, Middlesex Fells, Massachusetts.

In pools at low water mark, Sea Wall, mount Desert Island, Maine.

On shells and stones in tide pools, Spectacle Island, Penboscot Bay, Maine.

On Digenia simplex, Key West, Florida.

Washed ashore, St. Augustine, Florida.

On Agardhiella tenera, Bridgeport, Connecticut.

On Gelidium cartilagineum, washed ashore, Pacific Beach, California.

Pacific Beach, California, in pools at about half tide level.

On wooden piles, Conanicut Island, Rhode Island.

On various algae, Conanicut Island, Rhode Island.

On Scytosiphon lomentarium and other algae, Newport Rhode Island.

On Haloscaccion ramentaceum, near the Narrows, harbor of St. John's, Newfoundland.

In shallow water, Conanicut Island, Rhode Island.

On rocks at low water mark, La Jolla, California.

On rocks at extreme low water mark, Fort Point, San Francisco, California.

Carmelo Bay.

Washed ashore or growing in lower pools, Newport, Rhode Island.

On Fucus Harveyanus, San Pedro, California.

In warm shallow rock pools, near high water mark, on Scytosiphon lomentarium; Nahant, Massachusetts.

On Fucus evanescens, Pacific Grove, California.

On Egregia menziesii and on rocks at and below tide level, Carmelo Bay, Monterey County, California.

On Fucus vesiculosus, growing on woodwork of wharf, Blake's Point, Maine.

On stones, etc., Island Brook, Bridgeport, Connecticut, a short distance above tide water.

Forming patches on rocks between tide marks, Pacific Grove, California.

In great abundance upon rocks between tide marks, Carmel Bay, Monterey County, California.

Floating in clay pits, Glenwood, Medford, Massachusetts.

Island Brook, Bridgeport, Connecticut.

In fresh water, Santa Paula Mountains, California.

In dried ditches in a bog, Campobello, New Brunswick.

On Dilsea Californica, Coupeville, Washington.