ANNOTATIONS AND ADDITIONS. 291 



by the first founder of the cathedral, Ludwig the Pious ; and an 

 original document of the llth century says, "that when Bishop 

 Hezilo rebuilt the cathedral which had been burnt down, he enclosed 

 the roots of the rose-tree with a vault which still exists, raised upon 

 this vault the crypt, which was re-consecrated in 1061, and spread 

 out the branches of the rose-tree upon the walls." The stem now 

 living is 26 feet high and about two inches thick, and the outspread 

 branches cover about 32 feet of the external wall of the eastern 

 crypt ; it is doubtless of considerable antiquity, and well deserving 

 of the celebrity which it has gained throughout Germany. 



If extraordinary development in point of size is to be regarded 

 as a proof of long-continued organic life, particular attention is due 

 to one of the thalassophytes of the sub-marine vegetable world, i. e. to 

 the Fucus giganteus, or Macrocystis pyrifera of Agardh. According 

 to Captain Cook and Greorge 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. (Dar- 

 win, Journal of Researches into Natural History, 1845, p. 239 ; and 

 Captain Fitz-Roy in the Narrative 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. 1, 7, and 

 178 } Camille Montagne, Botanique cryptogame du Voyage de la 

 Bonite, 1846, p. 36.) The immense length to which the bands or 

 ribbands and the cords or lines of the cellular tissue of the Macro- 

 cystis attain, appears to be limited only by accidental injuries. 



( 13 ) p. 236. " Species of phcenogamom plants already contained 



in herbariums" 



We must carefully distinguish between three different questions : 

 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 



