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Ochrophyta · Brown Seaweed

Elachista sp.

Phylum
Ochrophyta
Class
Phaeophyceae
Order
Ectocarpales
Family
Chordariaceae

Elachista sp.

Rockweed tuft

Thallus is a tuft of mostly unbranched, pigmented, uniseriate filaments growing on Fucus, up to 0.7 cm (0.28 in) tall. Large, elongate unilocular sporangia commonly occur on colorless branched basal filaments, but these can be seen only with a microscope. This species can co-occur with Pylaiella sp., which is usually much longer and is always branched.

Habitat

This species usually occurs on Fucus or Palmaria in the mid intertidal of moderately protected shores in mid to late summer.

North Pacific Distribution

Arctic Ocean and Alaska Peninsula, Alaska to northern California; Russia

Former scientific names

misidentified as Elachista fucicola

Similar taxa

Pylaiella, Ectocarpus

References

Last updated December 26, 2010

Photos