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Genus (i.e. Fucus)
Species (i.e. Gardneri)
Common Name (i.e. Rock Weed)
Phylum (i.e. Ochrophyta)
All of the above
Green Rock Scum
Rosenvingiella polyrhiza
Authority:
(Rosenvinge) P.C. Silva
North Pacific Distribution:
Aleutian Is., Alaska, to Oregon.
Phylum:
Chlorophyta
Class:
Trebouxiophyceae
Order:
Prasiolales
Family:
Prasiolaceae
Former Scientific Names:
Gayella polyrhiza
Description: Thallus is an unbranched, narrow solid cylinder (to 80 μm wide), ranging in color from light green to dark green. Mature thalli are pluriseriate and reach at least several cm in length (~1 in). They are sometimes constricted at intervals. Reproductive cells, which can contain numerous male (smaller) or female (larger) gametes, can be seen on the thallus surface. Habitat: The species is found on rock at or above high water mark and may occur mixed with species of Prasiola. This species can withstand long periods out of the water in protected to semi-exposed habitats. It is frequently seen as a wide band in the high intertidal of the Aleutian Is. Similar taxa: Urospora, Ulothrix.

Detailed Description >> by Fabio Rindi

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