﻿PLATE XX. 

 Chorda Filum (L.) La 動 ur. 



LAMINARIACE/E. 



Norn. Jap. : Tsuru-vw. 



Chorda Fihun Lamour. Essai p. 26 ； Ivjellm. in Eneler u. Prantl's 

 NatCi に Pflanzenfam.， I Teil 2, p. 254, fig. 171 ； Harv. Phyc. Brit., tab. 

 CVII; Farlow Mar. Alg. of New Engl" p. 91， 1)1. VI， fig. 1 ； De Toni 

 Syll. Alg., Vol. Ill, p. 318 ； Ha uck Meeresalg., p. 394， fig. 172 ； Kuetz. 

 Sp. Alg., p. 548 («. o-enuina) ； Kuetz. Tab. Phyc, Vol. VIII, tab. 14 a. ― 

 ScytosipJion Fihnn J. Ag. Sp. Alg., Vol. I， p. 126. — Funis Filum L. in 

 Turn. Fuci, tab. 86. 



Root a small circular disc. Fronds sincrle or tufted, simple, 

 chord-like, sometimes twisted in age, 3-4 mm. in length and 

 3-5 mm. or more in diameter in the middle, very much attenuated 

 to a filiform stem at the base, and gradually tapering to a rather 

 acute point at the apex, everywhere covered, when you no-, with 

 scattered, pellucid or light-yellowish, gelatinous hairs ； when old, 

 these mostly disappear, the frond becoming more harsh and less 

 lubricous and traversed by an internal tube which is divided at 

 different intervals by diaphragms, not indicated by any external 

 constriction or swelling". Frond consist of three layer き.： the in- 

 nermost, of longitudinally running slender thread-like cells which 

 form so-called sieve-tube in the vicinity of diaphrap-m ； the in- 

 termediate, of long, cylindrical or polyhedral cells becominp- more 

 slender outward, being covered by a few layers of epidermal 

 cells i.e. the outermost layer. Paraphyscs clavate with slender 

 neck， protruding above unilocular sporanoia which are minute 

 and oval or elliptico-oblono-. oize of sporagia 27 ！ 1 by 9 一 10/ ノ； 



