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62 | Blades

Pacific Seaweeds

employed by the local canine population, and in one case with a pole behind a pub. Check your neighbourhood watering holes for this telltale species.

Habitat & Distribution

Species of Prasiola in our area are found growing on wood or rock above the high tide level or along freshwater streams. A unique aspect of their distribu-tion is their association with guano of marine birds. Locally, these plants are distributed from Alaska to central California.

Ulva Sea lettuce

Class Ulvophyceae Order Ulvales Family Ulvaceae

Number of Species

Ulva (Latin=marsh plant) contains a stunning 128 species and forms world-wide. Locally, it is represented by about 15 species, of which at least 8 develop into flat blades. Common species in our area include U. californica, U. “lactuca,” U. lobata, U. rigida, U. stenophylla and U. taeniata.

Description

In 2003, molecular studies collapsed Ulva and Enteromorpha into one genus: Ulva. We retain two entries for the genus here; see p. 66 for discussion of cylindrical forms.

Bladed species are two cells thick, and the blade may be long and narrow

Ulva sp.