Seanet High Intertidal

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Mastocarpus papillatus (C.Agardh) Montagne
Phylum Rhodophyta, Class Florideophyceae, Order Gigartinales, Family Phyllophoraceae

Morphology highly variable: thallus <15 cm tall,  flattened; varies in width with tips divided ~dichotomously; flattened faces of thalli covered thickly or sparsely with papillae of various sizes; dark brown to reddish black.  Male plants lack papillae & are light rose to yellowish in color.

Abundant, high to mid-intertidal zones, protected & exposed outer coast; dominant alga of these zones in central Calif., along with Endocladia.

Geo Range: Alaska to Baja
Synonyms: Gigartina papillata
Similar species:

Image: Endocladia muricata (top cntr, top rt, bottom rt),