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

Forming sheets on wet limestone, Salisbury, Connecticut.

On birch bark, Chocorua, New Hampshire.

On Postelsia palmaeformis, Land's End, San Francisco, California.

On Fucus evanescens, near Presidio, San Francisco, California.

On Zostera, Edgartown, Massachusetts.

In company with other desmids, forming a green coating on stalks of plants in quiet water, Pine Hill Swamp, Medford, Massachusetts.

On Myriophyllum, etc., in a small pond, Eastham, Massachusetts.

Forming with Phormidium sp. a gelatinous coating on weeds, etc., at the opening of an exhaust steam pipe, water works, marine hospital, San Francisco, California.

In company with other desmids among plants in quiet water, Pine Hill Swamp, Medford, Massachusetts.

Scattered through a mass of mostly fragmentary algae, near water mark, Herring Pond, Eastham, Massachusetts.

Floating in a water trough, San Leandro, California.

Little Nahant, Massachusetts, rock pools in upper litoral.

In the cortical layer of Ceramium rubrum, Eastham, Massachusetts.

Port Royal, Jamaica.

In a shallow bay with P. capitatus Lamarck and P. lamourouxii Decaisne, at the eastern end of Mariguana Island, Bahamas.

On sand in 3-10 dm. of water, with P. lamourouxii Decaisne (P.B.-A., No.1476), Fort George Cay, Caicos Islands.

On sand in 3-10 dm. of water, with P capitatus Lamarck (P.B.-A., No.1475) Fort George Cay, Caicos Island.

In rock pools above high tide line, White's Point, San Pedro, California.

Abundant throughout the year, in the middle of the litoral zone, on Corallines, San Pedro, California.

In small clusters on rocks, low litoral, sometimes mixed with N. Cokeri; Atwood (Samana) Cay.

In shallow water, forming mats on Bostrychia tenella (Vahl) J. Ag., in company with Lyngbya confervoides Ag. Jamaica.

On shaded rocks, low litoral, Great Ragged Island, Bahama.

On Sargassum, etc., with Erythrotrichia ceramicola (Lyng.) Aresch., Beaufort, North Carolina.

On Ahnfeltia plicata (Turn.) Fries, Matunuc Bach, Rhode Island.

On rocks along high tide line, breakwater, San Pedro harbor.

On stones at low water mark, Rose Island, Bahama.

In shallow water, Round Pond, Tewksbury, Massachusetts.

On hard, clayey shore, at high water mark, lying bare all but two or three hours of each tide, Mattapoisett, Massachusetts.

On rocks near high water line, breakwater, San Pedro harbor, California.

On small pebbles in the lower litoral zone, White Point, San Pedro, California.

On rocks along high tide line, White's Point, San Pedro, California.

In cryptostomata of Sargassum filipendula Ag., Wood's Hole, Massachusetts.

In old fronds of Nitella tenuissima (Coss.) Desv., Round Pond, Tewksbury, Massachusetts.

At low water mark, exposed shore, Coronado, California.

On Zostera marina, Bay Shore, Eastham, Massachusetts.

On rocky sides of a salt pool above high water mark, Ragged Island, Casco Bay, Maine, July 13, 1908, in company with Calothrix scopulorum (Web. & Mohr) Ag., Lyngbya subtilis Holden, etc.

On rocks along high water line, Breakwater, San Pedro Harbor, California.

In shallow muddy pond, Eastham, Massachusetts.

Growing on rocks wet with salt water, White's Point, near San Pedro, California.

Forming extensive coatings on sandy shore at high water mark, Mattapoisett, Massachusetts.

On trees, Cinchona, Jamaica.

On earth near Cinchona, Jamaica.

Among other algae in a gelatinous coating on woodwork, side of old mill race, wet by spray byt not submerged, North Saugus, Massachusetts,

In a shallow pool in woods, New Haven, Connecticut.

In masses on ground between tide marks, Eastham, Massachusetts.

Among Utricularia, etc., Round Pond, Tewksbury, Massachusetts.

In a small artificial pond in Middlesex Fells, Massachusetts.

Among mosses, etc., Round Pond, Tewksbury, Massachusetts.

In large floating masses, Lower Pond, Wakefield, Massachusetts.