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Attached to stones in swift water, Housatonic River, below Great falls, near New Milford, Conn.

On sides of basin of a fountain, Marine Garden, Kingston, Jamaica.

Washed ashore in large quantities, Horn Pond, Woburn.

In tufts from sandy bottom, in shallow water, St. Ann's Bay, Jamaica.

Growing on rocks and moss just above high water mark, but wet by spray in rough weather; Cape Rosier, Maine.

In a rapid current of stream Roaring River, St. Ann's, Jamaica.

Thrown up in extensive windrows on the shore of lake Michigan, Evanstown, Ill.

Growing over grass and moss, on wet clay bank, forming reddish-brown gelatinous masses, irregularly lobed, and fusing into layers; Ann Arbor, Mich.

On Zostera marina (common also on various algae and on stones), Bridgeport, Conn.

Growing in abundance in shallow water on dark mud bottom, Port Antonio, Jamaica.

Submerged in running water, Morgan's Mills, R.I.

In a brook, entirely submerged, in dark green masses, Norwich, Conn.

Mostly attached to pebbles on sandy bottom just below low water mark, Bridgeport, Conn.

Washed ashore at Annotto Bay, Jamaica.

On woodwork (common also on rocks) between tide marks, Bridgeport, Conn.

Washed ashore in considerable quantity at Hope Bay, Jamaica.

About half tide mark, on rocks exposed to the full force of the waves, Nahant, Mass.

Forming light-yellow exansions on rocks exposed to the force of the waves, Butler's Point, Wood's Hole. Mass.

In tufts at joints of Cymopolia barbata, Port Maria, Jamaica.

Washed ashore, Revere Beach, Mass.

Growing to the length of 60 centimetres, attached to stones etc., in running water; Pequonnock River, Bridgeport, Conn.

In crevices of rocks, Shelburne, N.H.

On vertical faces of trap rocks, Sargent's River, Woodbridge, Conn.

Running brook in Middlesex Fells, Mass.

On submerged plants and stones, in still water, Parrott's Pond, Bridgeport, Conn.

Kittery, Maine.

Growing on perpendicular rocks or on walls of caves, in places always dripping with water from above; Eagle Island, Penobscot Bay, Maine.

Filaments reaching a length of 60 centimetres, attached to small stones in warm water issuing from a mill; Berkley, R.I.

In rapid water, Huron River, Ann Arbor, Mich.

Abundant in a pool near West Chop, Martha's Vineyard.

Growing singly, attached to stones in deep rapid water, Quinebaug River, Lisbon, Conn.

In stagnant pool, Malden, Mass.

In running water, Alpine Garden, Mt. Washington, N.H.

On rocks below low water mark, Stratford Shoals Light, Long Island Sound, near Bridgeport, Conn.

On pebbles in shallow water, Suntaug Lake, Peabody, Mass.

Glacialis, Cambridge, Mass.

On Potamogeton lucens, Three Lakes, Ann Arbor, Mich.

Forming matted tufts in rocky tide pools, or under Fuci on perpendicular rocks, Buck's Island, Penobscot, Maine.

Growing in tubes of Sertularia, etc., Revere Beach, Mass.

On rocks near Pacific Grove, Cal.

On Rhodymenia palmata, washed ashore, Gay Head, Mass.

On algae and rocks, Pacific Grove, Cal.

On stones at low water mark, Revere Beach, Mass.

Autumn and winter form, growing mostly on stones in open water, Bridgeport, Conn.

On stones at low water mark of spring tides, Magnolia, Mass.

Washed ashore, Magnolia, Mass.

Floating in Little Harbor, Wood's Hole, Mass.

On Polysiphonia fastigiata; Nahant, Mass.

Forming a purplish coating on stones in ditch in salt marsh near Linden station, Revere, Mass.

On woodwork, Wellington, Medford, Mass.