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On stones in running water in the Arroyo Seco, Pasadena, California.

In company with Gloeocapsa magma (Breb.) Kuetz., on wet cliff, Middlesex Fells, Massachusetts.

Scattered filaments among A. Gomontiana Setchell, and Oscillatoria species, forming a gelatinous floating mass, Silver Lake, Wilmington, Massachusetts.

Forming films on Chara fragilis Desv., in company with O. tenuis Ag. and O. Splendida Grev., in a mill pond, Danvers, Massachusetts.

Forming a film on leaves etc., in a drying-up swamp, Thomson, McDuffie County, Georgia.

On moist ground, Ithaca Flats, New York.

On trees and earth, Cinchona, Jamaica.

Among Chaetomorpha californica Collins, in shallow rock pools of salt water, above high water mark, Laguna, California.

In a pond near seashorem with Zygnema, etc., Mattapoisett, Massachusetts.

Mill Brook, Middlesex Fells, Massachusetts.

On fronds of Dictyopteris delicatula Lamour., Barbados.

Among Cladophora sp., along high water line on rocks, Land's End, San Francisco, California.

Forming a pinkish scum on marsh pools, Sunken Meadow, Eastham, Massachusetts.

In a small pond, Nantucket, Massachusetts.

In a sulphur spring, Lake Temescal, Oakland, California.

Growing in water rich in organic matter, in a gutter by the roadside, Berkeley, California.

On cement wall of a fountain, Campus, University of California, Berkeley, California

Floating in The Bubble, Tufts College Campus, Massachusetts.

San Leandro Creek, Alameda County, California.

In hot water, Key Route power house, Oakland, California.

Forming a dense coriaceous coating on stumps of Spartina, ect., Sunken Meadow, Eastham, Massachusetts. In company with L.aestuarii (Mert.) Liebm., Microcoleus chthonoplastes (Fl.Dan.) Thuret, etc.

On shaded rocks, Nahant, Massachusetts.

Forming a very thin layer in a glass jar of salt water in the Physiological Laboratory of the University of California, Berkeley, California.

Washed ashore in the form of aegagropila-like bodies, ballshape or more irregular, west coast of the island of St. Croix.

Lying loose on the botten, same locality ( pools, Sunken Meadow, Eastham, Massachusetts).

In a small pond in pasture, Oberlin, Ohio.

In pond in which Japanese plants ewere cultivated, Missouri Botanical Garden, St. Louis, Missouri.

In Lily pond, Tower Grove Park, St. Louis, Missouri.

Washed ashore or epiphytie on other algae, Lime Tree Bay, south coast of the island of St. Croix.

On various algae, Beaufort, North Carolina.

On Halosaccion ramentaceum (L.) J. Ag., Rockport, Massachusetts.

On stones in Arroyo Seco, Los Angeles, California.

On submerged timber at Sweetwater Spring,Thomson, McDuffie County, Georgia.

On stones at 4-8 meters depth, Merriconeag Sound, Casco Bay, Maine.

Black Rock, New Bedford harbor, Massachusetts.

Pacific Beach, San Diego County, California.

On various species of algae, middle of littoral zone, Moss Beach, San Mateo County, California.

Among Utricularia, Winter Pond, Winchester, Massachusetts.

Among other algae, Winter Pond, Winchester, Massachusetts.

Among Zygnema, etc., Herring Pond, Eastham, Massachusetts.

Among filamentous algae, with other desmids, Round Pond, Tewksbury, Massachusetts.

Among various small algae, Cedar Pond, Massachusetts.

In the tissue of a minute animal, in a small pond, Medford, Massachusetts.

In a small muddy pond, Eastham, Massachusetts. In company with more or less abundant Euastrum bidentatum Naeg., and other desmids.

Among mosses and algae, Cedar Pond, Oreans.

Among other algae, Lake Idlewild, Wenham, Massachusetts.

In old fronds of Polysiphonia variegata (Ag.) Zan., Salt Pond, Eastham Massachusetts.

Among other desmids etc., Round Pond, Tewksbury, Massachusetts.

In tissue of dead Zostera marina, in marsh pools, Mattapoiset, Massachusetts.

On stems of Juncus militaris Bigelow, Chebacco Pond, Essex, Massachusetts.