28 Vol. XLIII., Art. 1— K. Yen do : 



compactly interwoven together. Its general outline becomes tall 

 conical, measm^ing, in a full-grown specimen, 30-40 cm. in height 

 and 15-20 cm. in diameter at the base (Plate I, fig. 1). Except- 

 ing these few cases, the holdfast of Alarla may be said to be as 

 in the typical form of Laminariaccœ. 



The tissue elements of the rhizines are quite simple in com- 

 parison with the stipe. Their inner part is constructed of filiform, 

 less branching, narrow tubes, septated at various lengths. These 

 tubes run longitudinally but undulating. In the axial part they 

 are somewhat loosely disposed, without any definite rule, but are 

 very compact around it. There is no apparent diflferentiation in 

 size or foriii in them and, so far as I have observed, the trumpet 

 hyphae are entirely wanting. The outer part agrees in important 

 points with the epidermal layer of the stipe, but is thinner. Cfr. 

 also, Wille : Beiträge z. physiol. Anat, der Lamin., p. 22. In 

 some species, abundant mucilage glands are found there, even in 

 those species which lack tliem in the blades of the adult stage. 



Crifptosfoniata, 



The cryptostomata found in some members of Alaria are not 

 pit-form as in the Fucaceous plants, but shallow depressions of 

 merely one or two cells deep on the surface of frond. In A. esculenta 

 Geev., a. crassifolia Kjellm., A. graucUfolia J. Ag., etc., they 

 appear as a conspicuous organ scattered on the blade especially in 

 an early post-embryonal stage of frond. In A. prœlonga Kjellm., 

 A. tceniata Kjellm., A. marglnata P. et R., etc., they are entirely 

 wanting. It is, however, not advisable to separate all Alaria into 

 two groups, cryptostoraated and non-cryptostomated, and to place 

 too much importance upon the organ for specific distinction is 



