Gracilaria Chorda Holm. 



Nom, Ja'5, : Tsttm-shimtno^ 

 PL. CLXI. 



Gracilaria Chorda Holm. On Mar. Alg. fr. Japan 1895, 

 p. 253 ; La Nuova Notarisia 1897, p. 23; De Toni Syll. Alg. 

 IV, p. 454. 



Fronds caespitose rising from a large circular scutate 

 disc, elongated, 60-100 cm. long, cylindrical with more or 

 less traceable main segment, thickened at the middle portion 

 into the thickness of 2-2.5 mm. in diameter, attenuated 

 below into the slender stem and tapering above into filiform 

 apex, furnished on all sides with alternate and similarly 

 shaped branches. Branches elongated often 60 cm. or more 

 'long, not densely arising, but scattered and strongly atte- 

 nuated gradually toward the base and apex; they are mostly 

 simple and naked, sometimes loaded with a few short and 

 slender, filiform branchlets. Frond internally consists of large 

 almost empty thin-walled cells, covered with sharply defined 

 thin layer of cortex which consists of a few layers of thick- 

 walled cells, arranged parallel to the surface. Cystocarps 

 sessile, prominent, hemispherical, not crowned with beaks ; 

 neucleus simple, not lobed and there is no filament connecting 

 pericarp and placenta. Tetraspores scattered among cortical 

 layer. Colour deep purplish red. Substance-spit cartilaginous ; 

 the plant becomes much collapsed and imperfectly adheres 

 to paper in drying. 



I'l.. CLXI-CLXV, Mn ch I >lS. 



