THE FUCACE.E OF JAPAN. 37 



character of tlio species was not satisfactorily advertised. The 

 following remarks ni;iy add something to the present knowledge 

 of the plant. 



Description of the species. Roots are disc-shaped, occasionally 

 attaining 7 cm. in diameter, flat on the lower surface and subhemi- 

 spherical on the upper, from which a stout cylindrical, rugose 

 stem arises. At the lower portion of the stem a number of decom- 

 poundly pinnated branches are given off patently. The upper 

 terminal point of the stem is truncated and complanated, with 

 short "anläge" of the branchlets on both sides. (Cf. PI. III. 

 fig. 7 b. under Cystophyllum Turneri). The lateral branches are 

 distichously pinnately disposed on the principal branches and 

 are exceedingly approximate. The principal branches are, in a 

 manner, a sort of "Kurztrieb." The pinuation of an order is 

 always in a plane at right angles to the plane in which the 

 pinnatiou of the next order lies. 



The lower parts of the stems of the lateral branches are 

 smooth and subcompressed, elliptical in cross section. Near the 

 insertion jwints they are much thickened, forming sub fusiform or 

 not infrequently angulate bases. When a well grown plant is 

 uprooted and beaten upon the shore for many days, the lateral 

 branches wear away from the point just above the swollen region. 

 The result is a robust twig with coarse dentation along both sides 

 of each branch (fig. 8.). 



The lateral branches are transformed either into the definite 

 branchlets (leaves) or into the filiform stems of the indefinite 

 branchlets. The leaves are linear 1.5-2 mm. wide and 10-20 mm. 

 long, occasionally measuring 30-35 mm. Well developed ones are 

 pinnately sected or, more strictly speaking, sympodially divided. 

 A slightly elevated midrib traverses the whole length of each leaf 



