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Answer for the clue "Green seaweed having a thallus two cells thick sea lettuce ", 4 letters:
ulva

Alternative clues for the word ulva

Word definitions for ulva in dictionaries

Wikipedia Word definitions in Wikipedia
Ulva is an island in the Inner Hebrides, Scotland. Ulva may also refer to: Ulva Island (New Zealand) New Ulva, on Danna, Scotland , an island in the Inner Hebrides Sea lettuce , the genus Ulva

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Ulva \Ul"va\, n. [L., sedge.] (Bot.) A genus of thin papery bright green seaweeds including the kinds called sea lettuce.

Usage examples of ulva.

The annual fluctuation in natural phytoplankton density appeared to be very slight, providing a good set of parameters to begin studying the curious interaction between Ulva morina and Thiouni.

Junko tinkered with the new computer long into the evening while Garner continued his experiments using the Ulva culture and the Thiobacillus collected by Medusa.

Bedford Institute of Oceanography just across town here but I think Ulva morina will be your best and only bet.

As I mentioned, one of my graduate students was describing Ulva morina and its epiphytes.

As the researchers watched, the Ulva cells, seeded onto an ordinary ice cube and pushed slowly through the solution, collected the Thio-uni cells.

The ice will be scooped into the nets and the Ulva seeded onto the ice by bombing and spraying.

Once the slick was captured and the Ulva and Thio-uni-saturated ice pieces were securely corralled, the ice would still have to be neutralized and disposed of as quickly as possible.

The smaller pieces not only increased the total surface area available to receive the Ulva, but also kept the larger pieces from rolling against each other and destabilizing the load in the nets.

Roland Alvarez called from Dalhousie and described to Carol what he believed would be the most likely place to find surface concentrations of Ulva morina.

If anything, he suggested hopefully, the spring conditions and the breakup of the pack ice greatly improved their chances of finding Ulva spores floating freely in the surface waters of the Atlantic.

Three bombers would collect the Ulva from the waters offshore of Nuuk, then head almost directly west some seven hundred miles to the corridor of ocean containing the slick.

Together, the three planes could douse nearly twelve acres of the surface with the Ulva solution, dropping more than twenty-one thousand gallons of the displaced seawater onto the site in less than a minute.

The phytoplankton cells were too small to be killed by the two-hundred-foot drop from the belly of the bombers, but no one was willing to bet that the Ulva would not be destroyed by sudden changes in salinity, temperature, or air pressure.

This was a planned overshoot--the Ulva was to be dropped west of the vessels so that the current could carry it back over the slick and past the collected ice.

About a mile to the west, the third Mars bomber finished releasing its load into the ocean from there, the surface currents would allow the Ulva to mix with the contaminated Thio-uni.