A Monogmpli of the Genas Alai-ia, 37 



them to be a kind of " excretory organ." Miyabe^) found a similar 

 organ in Undaria pinnatifida Sur., and the present writer^) in 

 Hirome undarioides Yendo. Afterwards, I described the cells iu 

 detail^) and expressed the view that these cells, are mucilage glands. 

 Sauvageaü*) noticed quite similar cells in the embryonal fronds of 

 A. esculenta Geev. and was inclined to regard them as a I'eservoir 

 of fucosan grains, but stated at the same time that it is a notice- 

 able fact to find them in the lacunae-wanting members of Lami- 

 nariaceas. 



I have also noticed the presence of the mucilage glands in 

 various species of Alaria in the course of the present study. The 

 glands have been carefully examined on A. crassifolia Kjellm., as 

 its fresh material is most easily accessible to me. Sauvageau's 

 observation on the glands of A. esculenta Geev. is by no means 

 exhaustive. The following remarks on those of A. crassifolia will 

 not be unnecessary for future investigators on the subject. 



The smallest specimen of A. crassifolia with the mucilage 

 gland, as far as I have observed, was 2.2 mm. in total height. 

 The frond was lanceolate with a cylindrical stipe of moderate 

 length, and the blade measured 0.61 mm. at its broadest part. 

 The upper part as well as the marginal area of the blade remained 

 still in the monostroraatic state. The mucilage glands were mostly 

 found at the boundary between the monostromatic and the poly- 

 stromatic area, in a few but irregular rows. Surface views of the 

 glands were mostly circular, but some in the upper part of the 

 blade more or less longitudinally stretched. The apartures of the 

 small ch'cular glands were little more than the size of single 



1) Yendo : Three New Mar. .AJgae. from Japan, p. 102. 



2) I'^ENDO : 1. c. 



3) I'entdo : On the Mucilage Glantls of Undaria. 



4) Sauyageau : Sur les " Glandes a Mucilage " ile certaines liaminaires, j). 12. 



