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Generally attached to stones in running water: found thoughout the yar in nearly all streams of the vicinity. Pequonnock River, Bridgeport, Conn.

On stones just below low water mark, shores of Buzzard's Bay, Wood's Hole, Mass.

Near high water mark, at the base of Spartina, Salicornia, etc.; commonly associated with Delesseria Leprieurii Mont. Bridgeport, Conn.

Fruiting in late summer and autumn. Bridgeport, Conn.

Growing in pools in caves, also washed ashore, La Jolla, California.

Forming irregular, firmly gelatinous balls on stones in rapid water of a brook, Mount Carmel, Conn.

Epiphytic on the fronds of Nemalion multifidum: Woods Hole, Mass.

Forming small, pubescent patches of a dirty light yellow color, (which soon dissappears after drying) on white oaks among pines, Ledyard, Conn.

On submerged plants in still water, Bridgeport, Conn.

In ditches in salt marsh, near Linden Station, Malden, Mass.

On trees, Cambridge, Mass.

On dripping rocks of Pequonnock River dam, Bridgeport, Conn.

In brackish water, mostly between tide marks, on stones and submerged plants, and floating in long, stringy masses. Bridgeport, Conn.

In patches on stones in shallow water, Bridgeport, Conn.

Forming small isolated blackish tufts (1-3 mm. in diameter), on smooth stones, in shallow water of Trading Cove Brook, Norwich, Conn.

Clay Pit, Medford, Mass.

On Zostera, commonly associated with Halothrix lumbricalis, Ectocarpus confervoides, etc., and sometimes with Punctaria latifolia. Bridgeport, Conn.

Floating in light green, woolly masses on Fitch's Pond, New Haven, Conn.

On piles between tide marks, Narragansett Bay, Newport, R.I.

Closely covering sandy, calcareous bottom, in shallow water, Port Antonio, Jamaica.

In brackish marsh pools, Bridgeport, Conn.

In dark patches in stones and woodwork, also epiphytic on Enteromorpha, etc., mostly near high water mark, Bridgeport, Conn.

In dark patches on stones and woodwork, also epiphytic on Enteromorpha, etc., mostly near high water mark, Bridgeport, Conn.

In deep pool, Ithaca Flats, N.Y.

Forming dark brownish patches on submerged limestone rocks, Twin Lakes, Salisbury, Conn.

Forming small tufts or extended of a blackish green color on stones on the swiftest currents of Roaring Brook, Cheshire, Conn.

Investing grasses, Utricularia etc., in still water, Bridgeport, Conn.

Forming a brownish or bluish green gelatinous layer on the floating leaves of Ruppia maritima in brackish water, Watch Hill Pond, Watch Hill, R.I.

Forming a reddish, closely adherent crust on rocks wet by spray, by dam across Still River, Brookfield, Conn.

Forming rather gelatinous, rusty or dirty green patches on wet vertical faces of trap rock, East Rock, New Haven, Conn.

Pequonnock River, Bridgeport, Conn. With occasional filaments of O. limosa Ag.

Forming irregular, firmly gelatinous balls on stones in rapid water of a brook, Mont Carmel, Conn.

Forming verdigris-green gelatinous sheaths, later becoming chartaceous, on stones and on leaves of Ruppia maritima in brackish water, Watch Hill Pond, Watch Hill, R.I.

In running brooks, winter and spring, Bridgeport and Stratford, Conn.

On sticks and stones in still and in running water, Bridgeport, Conn.

On dead sticks in still water, Bridgeport, Conn.

In Willow Brook, Norwich, Conn.

In running brooks, spring, Bridgeport, Conn.

Brook in Middlesex Fells, Mass.

Very abundant all winter on Potamogon, etc., in swift water in Huron River, Ann Arbor, Mich.

Massapoag Brook, Sharon Mass.

On stone walls of brook, Wakefield, Mass.

On submerged alder stems in still water. Bridgeport, Conn.

Echo Lake, Franconia Notch, N.H.

Cedar Pond, Lynn, Mass.

Running brook, Bridgeport, Conn.; found mostly in Autumn, Winter and Spring; more rarely in Summer.

Forming expanded masses, of a dark green color, at the edge og a ditch of brackish water, Quinnipiac marshes, New Haven, Conn.

On Ceramium rubrum and Cystoclonium purpurascens, off Buttler's Point, Wood's Hole, Mass., at a depth of from one to three meters.

Washed ashore, Lake Quannapowitt, Wakefield, Mass.

Grew's Pond, Falmouth, Mass.