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Forming tufts in an old brickyard, Baltimore, Maryland.

Forma confluens, on ground between tide marks, Cape Rosier, Maine.

On submerged stones in a pond at the foot of Windsor Lake, near St. John's, Newfoundland.

On dripping, vertical faces of the cliff, just above high water mark, Carmel Bay, Monterey County, California.

On rocks at the entrance of the harbor of St. John's, Newfoundland.

Growing densely crowded together upon rocks near high water mark, Land's End, San Francisco, California.

On reefs at extreme low water mark, Barbados.

On Dictyota dichotoma (Huds.) Lamour., Fort Macon Breakwater, Beaufort, North Carolina. U.S. Bureau of Fisheries, Beaufort Station.

On rocks at low tide, Barbados.

Forming a closely adherent reddish brown stratum on rocks at low water mark, Jaquish Island, Casco Bay, Maine.

On Dictyota dentata, Barbados.

On exposed rocks at extreme low water mark, Bathsheba, Barbados.

On stones at 4-10 meters deth, Harpswell Sound, Maine.

On bark, etc., Cinchona, Jamaica.

In rock pools near low water mark, rather exposed shore, Harpswell, Maine.

On decaying leaves, in a small pond, Wakefield, Massachusetts.

On rocks at low water, in tide pool, Woodmont, Connecticut.

Key West Florida.

Forming a dense coating on rocks at water mark in a large pool above high water, Ragged Island, Casco Bay, Maine.

In a tank, in which were kept specimens of Necturus maculosus Raf., which had been brought from Sandusky, Ohio.

On Zostera, in company with Pringsheimia scutata and other epiphytes, Salt Pond, Eastham, Massachusetts.

In rocky pools, South Harpswell, Maine.

On Zostera, Salt pond, Eastham, Massachusetts.

On bark, Cinchona, Jamaica.

In sheltered places, near low water mark, Barbados.

Washed ashore, Barbados.

In sheltered localities at low watermark, Barbados.

In shallow water, Meeting-House pond, Eastham, Massachusetts.

On Rhodymenia palmata (L.) Grev., in lower tide pools, exposed rocky shore, Ragged Island, Casco Bay, Maine.

Forming a red-purple stratum in company with Planococcus, under a mass of Phormidium, etc., Herring Pond, Eastham, Massachusetts.

On Pylaiella and Ectocarpus filaments, Harpswell, Maine.

Among submerged moss, with C. acerosum (Schrank) Ehrenb., C. Ehrenbergii Menegh., and other desmids, in a small pond, Eastham Massachusetts.

Among various floating algae in a warm pool above high water mark, Ragged Island, Casco Bay, Maine.

Forming a red-purple stratum in company with Micrococcus, under a mass of Phormidium, etc., Herring Pond, Eastham, Massachusetts.

Among algae in a small pond, Wakefield, Massachusetts.

On sandy soil, Mazapil, Zacatecas, Mexico.

In old and decaying water plants, pond near Pine Hill, Medford, Massachusetts.

In cells of Sphagnum, Chamaecyparis bog near Wood's Hole, Massachusetts.

In a sulphur spring, Iowa Falls, Iowa.

Forming rather firm films on plants and boards in a ditch, Eastham, Massachusetts.

Among various algae, in a small pond, Harpswell, Maine.

On a moist ground among various plants, but especially under Sabal glabra (Mill.). Sargent, Thomson, McDuffie County, Georgia.

Living symbiotically with Ophrydium versatile O.F. Muller, in a small pond, Eastham, Massachusetts.

In sheltred pools, north shore of Lake Superior, Two Harbors, Minnesota.

Among other floating algae in a pond near Pine Hill, Medford, Massachusetts.

Scattered colonies, whith other minute algae, among sterile Mougeotia, in a small pond, Wakefield, Massachusetts.

Among aquatic plants, in a pond near Pine Hill, Medford, Massachusetts.

Kingston Harbor, Jamaica

Mystic River Marshes, Malden, Massachusetts.

Cape Rosier, Maine.