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On rocks near low water mark, Bolinas, Marin Co., California.

On stones in a swift stream running into Lake Chabot, San Leandro, California.

In Scytosiphon lomentarius and Dictysiphon hippuroides, at low water mark, sheltered shore, Harpswell, Maine.

Mixed with Oe. macrandrium var. aemulans Hirn, in a small stream running into Lake Chabot, San Leandro, California.

On rocks in sublitoral zone, Butler's Point, Wood's Hole, Massachusetts.

On Pelvetia fastigiata, Land's End, San Francisco, California.

At the mouth of a fresh water stream where the tide backs up, near Richmond, Contra Costa County, California.

On lamina of Laminaria digitata, Inner Mark Island, Casco Bay, Maine.

Attached in dense tufts to the bottom of a high rock pool, Bailey's Island, Casco Bay, Maine.

Floating in watering trough, No. Berkeley, California.

Young plants from lower pool, Peak's Island, Portland, Maine.

On pebbles in sandy pool somewhat above low water mark, in beach, Marblehead Neck, Massachusetts.

On rocks at high water mark, Land's End, San Francisco, California.

On rocks along high tide level, Land's End, San Francisco, California; abundant the whole year round.

On Laminaria, Chondrus, etc., Harpswell, Maine.

Dredged off Gay Head, Massachusetts, in 14-24 meters depth.

Attached to roots, in a small waterfall, San Leandro, Alameda Co., California.

In masses of Ruppia maritima, salt marsh pool, West Berkeley, California.

On moist earth by roadside, Malden, Massachusetts.

On dripping boards, Lake Chabot, San Leandro, Alameda Co., California.

On dripping mesonry under railroad bridge, in company with Croococcus varius. A. Br., Melrose, Massachusetts.

In a stream at the outlet of Lake Chabot, San Leandro, Alameda Co., California.

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

On sand by roadside, near seashore, in company with Microcoleus vaginatus (Vauch.) Gom., Harpswell, Maine.

On moist claybank, Mountain View Cemetery, Oakland, California.

On grass and weeds, salt marsh, Alameda, California.

On mud in Golden Gate Park, San Francisco, California.

On steep wet rock near Winchester North Reservoir, Massachusetts.

Forming a red coating on sticks and stones in an old reservoir, Hayward's, near Oakland, California.

In a small puddle of water, Italian Cemetery, San Francisco, California.

Medford, Massachusetts.

On stony margin of Fresh Pond, Cambridge, Massachusetts.

Lying loose on the bottom of Winchester North Reservoir, Massachusetts.

In a shallow pond, Presidio, San Francisco, California.

In a ditch by R.R. track, San Francisco, California.

On Charophora fracta, etc., in a small pond, Medford, Massachusetts.

On side of wooden trough, Berkeley, California.

With akinetes, University of California, Berkeley, California.

On cliff about 30 meters above the sea, Farallone Islands, California.

In aquarium, University of California, Berkeley, California.

Floating in Stone Lake, Golden Gate Park, San Francisco, California.

In quiet shallow pool, Berkeley, California.

Floating in a pool of very salt water, Alameda, California.

On a cliff about 30 meters above the sea, Farallone Islands, California.

In a swift mountain stream in the foot hills of the Coast Range, near Forest Grove, Oregon.

In dense masses, floating in a shallow spring, somewhat shaded by rocks, Berkeley, California.

Floating in Little Lake Chabot, San Leandro, California.

On side of an aquarium, University of California, Berkeley, California.

In a brook, San Leandro, California.

Attached to stones and clay in a small waterfall, San Leandro, California.