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On a submerged board, with Calothrix Braunii Born. & Flah., etc., in a small pond, Nonamesset, Elizabeth Island, Massachusetts.

On submerged wood, among other algae, in a small pond, Nonamesset, Elizabeth Island, Massachusetts.

Floating in mats on the surface of pools, Sunken Meadow, Eastham, Massachusetts. At the station where this material was collected (see note to No. 1611) the salinity of the water is quite low; Spirogyra species are abundant, and the Cladophora fronds are

Endophytic in Iridaea laminarioides Bory, Fort Point; San Francisco, California.

In Laminaria Sinclairii (HHarv.) Farlow, Fort Point, San Francisco, California.

Epiphytic on Iridaea laminarioides Bory, Land's End, San Francisco, California.

On Dictyoneuron californicum Rupr., Pacific Grove, California.

In sphagnum, Lost Pond, Brookline, Massachusetts.

Epiphytic on Enteromorpha in pools in salt marsh, near Berkeley, California.

Floating in Lake Merced, San Francisco, California.

On moist sand, Mountain Lake, San Francisco, California.

On dripping rocks, Mount Tamalpais, Marin County, California.

Among other algae in a coating on stones in a brook, Arlington, Massachusetts.

In the shade on a bank of very soft sandstone, Lake Merced, San Francisco, California.

On dripping rocks, Mill Valley Works, Marin County, California.

On Cladophora in a fountain, Campus, University of California, Berkeley, California.

On moist soil, Lake Lagunita, Marin County, California.

Salt marsh, Oakland, California.

In a copper tank, Saint Louis, Missouri.

In salt marshes, Eastham, Massachusetts.

On rocks moistened by ocean spray in a shady place, Land's End, San Francisco, California.

Foaming sheaths on stalks of plants in shallow water, Great Pond, Eastham, Massachusetts.

Similar station, Eastham.

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

Floating in pools of salt water in marshes, Oakland, California.

On moist ground and in salt water, Oakland.

Growinf on overhanging rocks and in shaded pools, Pacific Grove, Californis.

Missouri Botanical Garden, Saint Louis, Missouri.

Growing on Halidrys dioica N.L. Gardner ms., White's Point, west of San Pedro, California.

In a pond, Weston, Massachusetts.

Growing on various, species of algae, middle litoral zone, Redondo, California.

Growing on Eucalyptus globulus, San Fransisco, California.

In a pool, Waltham, Massachusetts.

Growing on logs near high water mark, Camano Island, Eashington.

On Chaetomorpha aerea forma Linum (Fl. Dan.) Collins, Atlantic City, New Jersey.

Growing in pools, middle of litoral zone, San Pedro, California.

Growing on Amphiroa tuberculosa forma Californica (Decne.) S.& G., in rock pools near low tide, Moss Beach, San Mateo County, California.

Growing on a stone wall, just above high water mark, with fresh water running over it, Fort Point, San Francisco, California.

On stones and grass in Lake Merced, San Francisco, California.

On Scytosiphon lomentarius (lyng.) J. Ag., near high water mark, Land's End, San Francisco, California.

Growing on the necks of pholiads, in the upper sublitoral zone, Port Defiance, Tocoma, Washington.

East Sound, Orcas Island, Washington.

On Cystoseira osmundacea (Menz) Ag., San Pedro, California.

On rocks, middle of litoral zone, Laguna, Orange County, California.

On rocks moistened by ocean spray, Land's End, San Francisco, California.

Forming a layer on a glass aquarium jar, Physical Laboratory of the University of California, Berkeley, California.

On moist ground, Pine Banks Park, Melrose, Massachusetts.

On window of conservatory, University of California, Berkeley, California.

Growing on a claybank, along a railroad, Mount Tamalpais, Marin County, California.

Forming a thin layer of erect filaments on moist claybank. Mount Tamalpais, Marin Vounty, California.