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On Ascophyllum, Little Harbor, Wood's Hole, Mass.

In stream formed by melting ice, Boulder Creek, Colo.

Bridgeport, Conn.

On leaves of Phyllospadix, Duxbury Reef, Marin Co., Cal.

On submerged leaves, etc., in quiet water, Bridgeport, Conn.

On stonework, of dam at Moody's Pond, Bridgeport, Conn.

On wooden fence running down below low water mark, West Beach, Eagle Island, Penobscot Bay, Maine.

Floating on the surface, forming a verdigris-green scum; Twin Lakes, Salisbury, Conn.

Peck's Mill Pond, Putney, Conn.

On shells, Twin Lakes, Salisbury, Litchfield Co., Conn.

In tangled felty strata and disseminated among Scytonema crispum; pool in North Haven, Conn.

On leaves of Potamogeton, etc., Ithaca, N.Y.

Growing in dense masses in high shallow pool, Spectacle Island, penobscot Bay, Maine.

On the under side of rocks between tides, Carmel Bay, monterey Co., California.

In shallow tide pools, Bar Harbor, Maine.

In tufts on muddy bottom of shallow pool, Spectacle Island, Penobscot Bay, Maine.

In tidepools, Newport, R.I.

In rapidly flowing water on the rocky bed of a small stream which becomes dry early in the summer; hills about two miles southwest of Bloomington, San Bernadino Co., California.

On rocks near high water mark, Carmel Bay, Monterey Co., California.

On the piles of wharf of the U.S. Life Saving Station near Fort Point, San Francisco, California.

On the piles of the wharf of the U.S. Life Saving Station near Fort Point, San Francisco, California.

On the rocky side and edges of upper tide pools, San Diego, California.

On Laurencia paniculata and other algae, La Jolla, California.

On corals, Tortugas, Florida.

Abundant on other algae and on Phyllospadix, in quiet water, San Pedro, California.

On piles of wharf of the U.S. Life Saving Station near Fort Point, San Francisco, California.

Abundant upon rocks between tides, Golden Gate, California.

Washed ashore, Edgartown, Mass.

Penfield Reef, near Bridgeport, Conn.

Bottoms of small ponds just drying up, Black Lands east of Tulare, Tulare Co., California.

On shells of Spirobis, on Fucus, Spectacle Island, Penobscot Bay, Maine.

On Zostera in 1 to 2 m. depth at low tide, Edgartown, Mass.

On old warf logs, about one meter below water mark, Edgartown, Mass.

On the sandy bottom of a winter pond which becomes dry in summer, San Bernadino, California.

In dead shells, Cape Rosier, Maine.

On algae, Fresh Pond (brackish), Stratford, Conn.

On muddy bottom, attached to various algae, at two meters depth, Edgartown, Mass.

On Chorda, attached to an old wreck, Edgartown, Mass.

In shallow pools, Spectacle Island, Penobscot Bay, Maine.

In rock pools, Woodmont, Conn.

On rocks between tide marks, Eagle Island, Penobscot Bay, Maine.

On sand-covered rocks, in upper tide pools, San Diego, California.

Reduced form, on woodwork, Atlantic City, New Jersey.

In tide pools, Cape Rosier, Maine.

On stones between tide marks, Bridgeport, Conn.

Forming irregularly bullate, thick-walled, yellowish brown bladders, on Ascophyllum nodosum; Wood's Hole, Mass.

Growing below low water mark, Revere Beach, Mass.

On Fucus and other algae in shallow tide pool, Spectacle Island, Penobscot Bay, Maine.

From deep water, La Jolla, California.

Growing in lower tide pools, or cast up from deep water, La Jolla, California.