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Abundant in quiet brackish water, often forming felt-like sheets, Bridgeport, Conn.

On perpendicular cliffs, forming sheets of considerable size, Saugus, Mass.

On stonework of dam, Saugus, Mass.

Chiefly buoyed up in nebulous masses in quiet waters, Bridgeport, Conn.

Forming dark bluish purple gelatinous patches, often considerable extent on rocks in swiftly flowing current, Quinebaug River, Lisbon, Conn.

In similar locality, Bridgeport, Conn.

Forming bladders on stems of old Fucus vesiculosus L., Quamquisset Harbor, Falmouth, Mass.

On Entermorpha intestinalis (L.) Link, in ditches in salt marshes. Woods Hole, Mass.

Berkeley, California.

Among Mougeotia in a pool in a pasture, Exeter, Rhode Island.

Among Utricularia, Shiner Pond, Middlesex Fells, Massachusetts.

Among other algae in Shiner Pond, Middlesex Fells, Massachusetts.

With other algae among Sphagnum in small pool, Eastham, Massachusetts.

On Zostera, Juniper Point, Salem, Massachusetts.

In a small pool in a garden, Chocorua, New Hampshire.

In Lily Pool, Mountain Park, Mount Tom, Massachusetts.

Among Sphagnum in a small pond, nearly dried up, Eastham, Massachusetts.

Among Oedogonium, with other small algae, Hemlock Pool, Middlesex Fells, Massachusetts.

Among mosses, etc., small pool, Eastham, Massachusetts.

Washington's Pond, Cranston, Rhode Island.

Among Sphagnum, Lost Pond, Brookline, Massachusetts.

Among aquatic plants, in a clay pit, West Cambridge, Massachusetts.

Among water plants in small pond, Eastham, Massachusetts.

Among Myriophyllum, with other desmids, Shiner Pool, Middlesex Fells, Massachusetts.

With various other small algae among submerged moss, Hemlock Pool, Middlesex Fells, Massachusetts.

Among submerged moss, Hemlock Pool, Middlesex Fells, Massachusetts.

Among other algae, in a small pool, Stoneham, Massachusetts.

Among submerged moss, with various other algae, Hemlock Pool, Middlesex Fells, Massachusetts.

On the shady side of a dripping water tank, Berkeley, California.

On rocks just above high water mark, Cape Rosier, Maine.

On stones in rapid trout brook, Round Pond, Maine.

On Rhodomela lycopodioides, Harpswell, Maine.

With other desmids, among water plants in a small pond, Eastham, Massachusetts.

Among submerged moss, with other desmids, Hemlock Pool, Middlesex Falls, Massachusetts.

Adhering to stones, at mouth of trout brook, Round Pond, Maine.

Central Park Pond, Dover, New Hampshire.

In a stone drinking fountain, Providence, Rhode Island.

Among submerged Sphagnum, Lost Pond, Massachusetts.

Among Utricularia, Hemlock Pool, Middlesex Fells, Massachusetts.

Among mosses in company with other desmids, Hemlock Pool, Middlesex Fells, Massachusetts.

On bowlders in a shaded waterfall in a small stream flowing into Lake Temescal, Oakland, California.

In fronds of Ralfsia Borneti Kuckuck, on shells, Cape Rosier, Maine.

Growing on damp boards and soil, Juneau, Alaska.

Cap á l'aigle, St. Lawrence River, Canada.

On rocks in a small artificial cascade, West Lake Park, Los Angeles, California.

On rocks and in tide pools in the upper titoral zone, Lagoona, California.

On and in mud barely under water, Central Park Pond, Dover, New Hampshire.

Among Cladophora expansa, etc., in brackish pool, near Harrington Sound.

Forming a reddish film on decaying algae in a small pond near Harrington Sound, in company with L. lutea, L. semiplena, Chroococcus turgidus, etc.

In a gelatinous mass in brackish pool, near Harrington Sound, with O. Bonnemaisoni, Chroococcus turgidus etc.