91 



Setch. and Gardn. Alg. of N. W. Amer. p. 3Q7.--Fucus f>alinclla, Gmelin, 

 Hist. Fucorum, Taf. XXIII. 



* 



Fronds membranaceous, irregularly parted into di-polychotomous or 

 subpalmately lobed blades, which again may become lacerated into ir 

 regularly shaped minor segments ending in blunt apices, with entire or 

 minutely spinulated and undulato-sinuated margins. The basal part of a 

 blade often becomes more or less thickened as if provided with evanescent 

 midrib, but no sort of rib or vein is fo bs founj, and, by gradually 

 wasting away of the membr;ine in the lower portion of frond the plant 

 often appeares to have more or less elongated ancipito-compressed stem 

 which often measures 3-10 cm. in length. Thus the frond is sometimes 

 irregularly lobed simple leaf, sometimes provided with branches, each 

 of which terminates with an irregularly clefted or longitudinally splitted 



blades having fan-shaped, cordale or reniform outline, and they arc spread 







'n one plane with some lobes overlapping to each other. Frond consists 

 of 3 layers ; epidermal, cortical and medullary. The epidermal layer 

 consists of a single layer of vertically arranged small cells ; corticaU 

 of a few layers of almost globular cells. The medullary layer which 

 forms the main portion of the thickness of frond consists of large and 

 elongated elliptical ceils, accompanied by subglobulur ones, which are 

 longitudinally arranged in rather loose aggregation without any definite 

 order, as if composed of anastomosing hyphal cells. A peculiarity in 

 the structure of the present plant is the presence of a yellowish homo- 

 genous hyaline substance in some of the medullary cells ; those 

 containing it are more elongated than the others, in most c:;r-es 

 having rod-like or fusiform shape of irregular outline, and have no 

 definite position. Colour of the peculiar contents is mostly yellowish, 

 but sometimes milkv or colourles;. Fruits unknown. Colour purplish- 



