OLIVE-BROWN SEAWEEDS. 249 



very young Fucus plants, for example, which may indicate 

 as other facts do, that there is no great gulf separating 

 trichothallic growth from that by an apical cell, or group of 

 equivalent initial cells. 



These few facts not commonly brought together, and 

 apt to be taken for insignificant in themselves, may never- 

 theless help us to think less of the differences that exist 

 and cause confusion in the classification of the orders of 

 PJiceophycece, and more of the points, many of them more 

 obvious than those I have cited, which lead us to group them 

 altogether in one great sub-class. 



BIBLIOGRAPHY. 



(1) Bower, F. O. On the Development of the Conceptacle in 



the Fucacese. Quart, journ. Micr. Sci., p. 36, 1880. 



(2) Oltmanns, F. Beitrage zur Kenntniss der Fucaceen. Biblio- 



theca Botanica, heft 14, 1889. 



(3) Barton, E. S. A Systematic and Structural Account of the 



Genus Turbinaria. Linn. Soc. Trans. Bot., 2nd ser., vol. iii., 

 part v., 1891. 



(4) Barton, E. S. Recent Researches on Olive-brown Sea- 



weeds. Natural Science, vol. iv., Jan., 1894. 



(5) Mitchell, M. O., and Whitting, F. G. On Splachnidium 



rugosum grev., the Type of a New Order of Algae. Murray's 

 Phycological Memoirs, part i., 1892 (Dulau & Co.). 



(6) Mitchell, M. O. On the Structure of Hydrodathrus. Ibid., 



part ii., 1893. 



(7) Murray, George. On the Cryptostomata of Adenocystis, 



Alaria and Saccorhisa. Ibid., part ii., 1893. 



(8) Smith, A. L., and Whitting, F. G. Notes on the Sori of 



Macrocystis and Postelsia. Ibid., part iii., 1895. 



(9) KARSAKOFF, N. Quelques remarques sur le Genre Myrio- 



tricJiia. Journal de Botanique, Dec, 1892. 

 (10) BORNET, Ed. Note sur quelques Ectocarpus. Bull, de la 

 Soc. Bot. de France, 1 89 1 . 



George Murray. 



