Plocamium abnorme Hook, et Harv. 



Nom, Jap. : Yukari. 



PL. CI, 



Plocamium abnorme Hook, et Harv. Alg. Nov. Zel. in Hook. 

 Journ. p. 543; }. Ag. Sp. Alg. II, p. 401, Epicr. p. 343; Harv. 

 Ner. Austr. t. XLIII; Kiitz. Tab. Phyc. Vol. XVI, t. 50, f. d-e. 



Fronds numerous from the same base forming a subglobose tuft, 

 attaching to stones, rocks, shells etc. by basal fibrous roots trans- 

 formed from branchlets (sometimes the plant attaches to another 

 alga by upper branches as shown in fig-. 4), compressed, linear or 

 filiform, thin, membranaceous, generally nearly 7 cm. hicrh, but 

 sometimes not above 5 cm. and at others 15 cm. long, their width 

 about 0.5-2 mm., often very fine upwards, everywhere gently flexu- 

 ose, much branched from the very base, or in some robust ones 

 lower portions denudated and furnished with remains of wasted 

 branches. Size of fronds, breadth of parts, density of branches and 

 the substance much vary according to specimens. Branches all 

 distichous, 3-4 times decompound pinnate, alternate and patent, 

 the lower ones longer than the upper and gradually becoming 

 shorter above, so that the ramification is somewhat corymbose ; 

 they are throughout alternate in geminate manner, of which the 

 lower one is always simple and the upper decompounded, and the 

 simple one is 2-3 mm. long, entire, tapering to a fine point from 

 broader base, and more or less incurved. In extreme branches 

 ramuli are also arranged in alternate rows, two on one side (some- 

 times here and there three) and as many on the other, in all of 

 which lower or the lowest one is always simple and the upper with 



PL. CI CV, May. 1913. 



