ANNOTATIONS AND ADDITIONS. 97 



or Macrocystis pyrifera of Agardh. According to Captain 

 Cook and George Forster, this sea-plant attains a length of 

 360 English feet ; surpassing, therefore, the height of the 

 loftiest Coniferae, even that of the Sequoia gigantea, Endl., 

 or Taxodium sempervirens, Hook and Arnott, which grows in 

 California. (Darwin, Journal of Researches into Natural 

 History, 1845, p. 239; and Captain Fitz-Roy in the Nar- 

 rative of the Voyages of the Adventure and Beagle, vol. ii. 

 p. 363.) Macrocystis pyrifera is found from 64 south to 

 45 north latitude, as far as San Francisco on the north- 

 west coast of America ; and Joseph Hooker believes it to 

 extend as far as Kamtschatka. In the Antarctic seas it is 

 even seen floating among the pack-ice. (Joseph Hooker, 

 Botany of the Antarctic Voyage under the command of Sir 

 James Ross, 1844, pp. 7, 1, and 178; Camille Montague, 

 Botanique cryptogame du Voyage de la Bonite, 1846, 

 p. 36.) The immense length to which the bands or rib- 

 bands and the cords or lines of the cellular tissue of the 

 Macrocystis attain, appears to be limited only by accidental 

 injuries. 



( 13 ) p. 17. "Species of phanogamous plants already 

 contained in herbariums." 



We must carefully distinguish between three different 

 q&sstions : How many species of plants are described in 

 printed works ? how many have been discovered, i. e. are 

 contained in herbariums, though without being described ? 

 how many are probably existing on the globe ? Murray's 

 edition of the Linnean system contains, including crypto- 



VOL. II. H 



