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On Rhodymenia palmata, in tide pool, Nahant, Massachusetts.

On Chondria flagelliformis and other algæ, in tide pool, Spectacle Island, Penobscot Bay, Maine.

In shallow water, Fresh Pond (brackish) Stratford, Connecticut.

Creeping over corals, near the shore, St. Croix.

In crevices beneath overhanging rocks, at low water mark, Nahant, Massachusetts.

On Dictysiphon foeniculaceus etc., in tide pool, Spectacle Island, Penobscot Bay, Maine.

On rocks between tides, Land's End, San Francisco, California.

Forming a felty stratum, of yellowish or orange tint, on moist limestone rocks, shore of Husatonic River, near Gaylordaville, Connecticut.

Forming extensive dark green wolly masses in stagnant water, North Haven, Connecticut.

Forming a felty stratum, of yellowish or orange tint, on moist limestone rocks, shore of Husatonic River, near Gaylordsville, Connecticut.

On rocks between tides, Fort Point, San Francisco, California.

In still water, West Falmouth, Massachusetts.

Between tide marks, La Jolla, San Diego County, California.

On various algae, Newport, Rhode Island.

In a stagnant pool connected with the lower of Twin Lakes, mostly resting on the bottom, but attached when young to sticks, etc.: Growing to the diameter of about 5 cm.: Salisbury, Lichfield County, Connecticut.

On submerged plants in still water, Bridgeport, Connecticut.

On Polysiphonia fastigiata, in tide pool, Little Cranberry Island, Maine.

On various algae, at low water mark, Nahant, Massachusetts.

On cypress logs floating in Lake Pontchartrain, Louisiana. The lake is quite salt, connecting with the Gulf of Mexico

Growing on roots of Rhizophora Mangle, in lagoons, Island of St. Croix.

In shallow water, harbor of St. Thomas.

On bark of White Oak trees, Gaugus, Massachusetts.

In lagoons, Island of St. Croix.

Floating in a roadside pool, near Spot Pond, Stoneham, Massachusetts.

Growing on sand, etc., in shallow tide pools near high water mark, La Jolla, San Diego County, California.

On Ascophyllum nodosum and Fucus vesiculosus, Cape Rosier, Maine.

On Fuci between tide marks, Buck's Island, Penobscot Bay, Maine.

In brook on stones under falling water, Medford, Massachusetts.

Adhering to bricks and stones, in hot water from condensers of steam engines of the water works, Schenectady, New York.

Forming small patches of a verdigris-green color, in warm water of escape from a steam boiler, Berkeley, Rhode Island.

Fairyland, Bermuda.

Endophytic in Azolla caroliniana, growing in pools in the bed of Los Angeles River, Los Angeles, California.

Among various algae, Jamaica.

On wet cliff, Cascade, Melrose, Massachusetts, among various algae, including some Nostoc microscopicum Carm.

In fresh water, Bath, Jamaica.

In a ditch, Medford, Massachusetts.

On rocks below Cascade, Melrose, Massachusetts. In rapidly running water.

On calcareous rocks in caves by the seashore Bermuda.

On soft crumbling rocks at low water mark, Ochre Point, Newport, Rhode Island.

On stalks of Spartina etc., in shallow water, Long Pond, Mount Desert Island, Maine.

In shallow water, Wright's Pond, Middlesex Fells, Massachusetts.

In pools in the bed of Los Angeles River, Los Angeles, California.

Near Manchioneal, Jamaica.

In slightly brackish water of a clay-pit, Medford, Massachusetts.

In tide pool, Crowninshield Point, Seal Harbor, Mount Desert Island, Maine.

Forming spongy masses, on the edges of small hollows, or sometimes filing these hollows in otherwise smooth rocks, near upper limit of litoral zone, Carmer Bay, Monterey County, California.

On Fucus evanescens forma macrocephalus, near Seattle, Washington.

In conservatory, Golden Gate park, San Francisco, California.

On Stypopodium lobatum, Montego Bay, Jamaica.

On rocks, noth side of Bolinas ridge, Marin County, California.