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It is the kelp, or Macrocystis pyrifera. This plant grows on every rock from low-water mark to a great depth, both on the outer coast and within the channels. I believe, during the voyages of the Adventure and Beagle, not one rock near the surface was discovered which was not buoyed by this floating weed.
The local flora was represented by fine floating algae: sea tangle, and kelp from the genus Macrocystis, saturated with the mucilage their pores perspire, from which I selected a wonderful Nemastoma geliniaroidea, classifying it with the natural curiosities in the museum. On January 4, two days after crossing the Coral Sea, we raised the coast of Papua.
It is the kelp, or Macrocystis pyrifera. This plant grows on every rock from low-water mark to a great depth, both on the outer coast and within the channels. Hooker tells me, it extends to the R. San Francisco in California, and perhaps even to Kamtschatka.
We say "so-called" advisedly, for in the Algae are included the largest forms of plant life. The Macrocystis pyrifera, an Algae, is the largest of all known plants. It is a sea weed that floats free and unattached in the ocean. At the same time its structure on examination shows it to belong to the same class of plants as the minute palmellae which we have been studying.
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