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On rocks about outer spindle, Wood's Hole, Mass.

In dense tufts on stones in shallow water, St. Ann's Bay, Jamaica.

Eagle Island, Penobscot Bay, Maine.

In immense tufts along shore, Port Maria, Jamaica.

In tufts along shore of east harbor, Port Antonio, Jamaica.

Goose Creek, Cape Rosier, Maine.

On Zostera marina, Little Harbor, Wood's Hole, Mass.

On Zostera, below low water mark. Bridgeport, Conn.

On the stone wall of a spring of cold water, Middlesex Fells, Mass.

Spot Pond Brook, Melrose, Mass.

Island Brook, Bridgeport, Conn.

On Digenia simplex and other algae, Key West, Florida.

Forming a crust on stones between tide marks, Fresh Pond, Stratford, Conn.

Forming a floating scum at Jamaica Pond, Jamaica Plain, Mass.

Growing unattached in tangled tufts resting on mud or sand among Spartina, etc.; fruiting most abundantly at or about high water mark in late winter or spring. Receptacles sometimes 7 or 8 cm. long; generally, if not always, exclusively antheridial in thi

On various algae and on stones, La Jolla, California.

On perpendicular wet rock, Middlesex Fells, Mass.

Growing on sand between tide marks, salt marsh, Wood's Hole, Mass.

Forming an incrustation on edge of rocky tide pool, at extreme high water mark, Cape Rosier, Maine.

Forming globular thalli on Ruppia maritima in brackish water, Watch Hill Pond, Watch Hill, R.I.

On Zostera marina, Marblehead, Mass.

Carpeting the muddy bottom in shoal water within the reef at Port Antonio, Jamaica.

Floating in verdigris-green patches, on the pool below Factory Pond, Bridgeport, Conn.

On shells at and below low water mark, Cold Spring Harbor, N.Y.

On Fucus vesiculosus, half tide, Cuttyhunk, Mass.

On Sertularia, etc., Spectacle Island, Penobscot Bay, Maine.

In the gelatinous sheaths of Hyalotheca dissiliens, in ditches in a cranberry bog, Norwich, Conn.

On Zostera marina, Goose Creek, Cape Rosier, Maine.

Among leaves of Utricularia in a cold pool, Cold Spring Harbor, New York.

Mill Pond, Lantern Hill, Ledyard, Conn.

On granite rocks near Shelburne, N.H.

On stones just above the surface of the water of Massapoag Brook, Sharon, Mass.

Forming an uninterrupted coating on submerged limestone rocks in quiet water, Lime Rock, R.I.

On stones in quiet water, Pequonnock River, below Factory Pond dam, Bridgeport, Conn.

On pebbles etc., shores of Pranker's Pond, Saugus, Mass.

When young attached to stones and weeds, afterwards floating free; shore of Cayuga Lake, Ithaca, N.Y.

On smooth red sandstone in running water, Wintergreen Falls, Hamden, near New Haven, Conn.

Spot Pond, Medford, Mass.

In shells of Mya arenaria on a sandy beach below low water mark, Quisset, Mass.

On cliffs at high water mark, Eagle Island, Penobscot Bay, Maine.

On leaves of Zostera marina, Quisset, Mass.

On stones at border of a pond, Newport, R.I.

On Punctaria, Wood's Hole, Mass.

Among various species of Algae, (Enteromorpha, Cladophora, etc.), lagoon, Eagle Island, Penobscot Bay, Maine.

On rocks, mostly below low water mark, winter and spring; Bridgeport, Conn.

On pebbles at low water mark, La Jolla, Cal.

On stones in a small stream of fresh water just above high water mark, head of Vineyard Haven, Martha's Vineyard, Mass.

Floating in masses with Lyngbya æstuarii, Cladophora expansa, etc. ; lagoon, Eagle Island, Penobscot Bay, Maine.

On rocks at low water mark, Marblehead Neck, Mass.

Floating, off Gay Head and Cuttyhunk, Mass.