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On Cladophora glaucescens, in tide pools, Cape Rosier, Maine.

Robust form on mussels near high water mark, also on rocks; Bridgeport harbor, Connecticut.

On stones about high water mark, Bridgeport harbor, Connecticut.

Upper tide pool, Cape Rosier, Maine.

Lynn marshes, Massachusetts.

Attached to gravel in shallow water, brackish pond in Seaside Park, Bridgeport, Connecticut.

On culms of Spartina, Lower Bay, Weymouth, Massachusetts.

On pebbles of beach, between tide marks, Spectacle Island, Penobscott Bay, Maine.

On beams of an old barge, in brackish water, Charles River, Cambridge, Massachusetts.

Narrow form, attached to firm sandy bottom between tide marks, Bridgeport, Connecticut.

On gravelly bottom of pool at low water, Spectacle Island, Penobscot Bay, Maine.

On stones and shells Fresh Pond (brackish), Stratford, Connecticut.

On stones and shells, Fresh Pond (brackish), Stratford, Connecticut.

On muddy rocks, below low water mark, Black Rock Beacon, near Bridgeport, Connecticut.

On sandy bottom below low water mark in Bridgeport harbor, Connecticut.

Mill River, Fairfield, Connecticut.

On old trunks of Cupressus macrocarpa, Cypress Point, Monterey, California.

On muddy rocks, at and below low water mark, Newport, Rhode Island.

Great Falls of the Husatonic River, near New Milford, Connecticut.

In creek in marshes, Malden, Massachusetts.

On Corallina officinalis at and below low water mark, Newport, Rhode Island.

On Zostera marina, Newport, Rhode Island.

In tufts on larger algae, St. Ann's Bay, Jamaica.

On rocks near low water mark, Land's End, San Francisco, California.

Forming dense mats on exposed rocks near high water mark, Fort Point, San Francisco.

Forming tufts on Zostera marina, Bridgeport, Connecticut.

On Graciliaria confervoides, thrown ashore, Santa Cruz, California.

In pools on Duxbury Reef, Marin County, California.

On stones at or near extreme low water mark, Fort Ross, Sonoma County, California.

On stones etc., Cromwell Harbor Brook, Bar Harbor, Maine.

Forming an incrustation in a tide pool, York Island, Penobscot Bay, Maine.

In roadside pool, Valley St., Medford, Massachusetts.

Forming a Phormidium-like coating on iron pillars between tide marks, at Black Rock Beacon, near Bridgeport, Connecticut.

In small pools in company with Micrasterias denticulata Ralfs.; Ridge Hill, Massachusetts.

Lying loose on the ground, salt marsh, Mystic River, Massachusetts.

Attached to pebbles or floating, Fresh Pond, (brackish) Stratford, Connecticut.

In small pools near Chestnut Hill, Massachusetts.

Attached to sedges, fresh water swamp, Falmouth, Massachusetts.

Fresh Pond, Cambridge.

On rocks between tide marks, Pacific Grove, California.

On rocks, forming a distinct zone in the upper third of the litoral region; Pyramid Point, Monterey County, California.

In a rock pool, just above high water mark, Easton's Point, Newport, Rhode Island.

On woodwork of a wreck, on a sandy beach, St. Ann's Bay, Jamaica.

On rocks at low water mark, San Pedro, California.

Floating, Monterey, California.

On rocks, forming an interrupted zone near high water mark, Land's End, San Francisco, California.

On rock, forming a distinct zone in the middle zone of the litoral region, Pyramid Point, Monterey County, California.

On Phyllophora Brodiaei, Newport, Rhode Island.

Washed ashore, Key West. Florida.

On stones at and just below low water mark, Fort Point, San Francisco, California.