﻿PLATE XIX. 



Myelophycus csespitosus (Harv.) Kjellm. 



ENCCELIACE/E. 



h 



Norn, Jap. : Iwa - hig" 



Myclopliycus c ce spit o sits Kjellm. in Engl. et Prantl's Natiirl. Pflanzenfam. 

 I Teil, 2, p. 202, fig. 141 ； De Toni Phyc. Jap. Nov. (1895), p. 55 ； Id. 

 Syll. A1q\, Vol. III， p. 484. — Okam. Alg. Jap. Exsic, Fasc. I， no. 44. — 

 Chordaria simplex Harv. in Gray's List of Jap. Plant, (1856), Al^se, p. 

 331， no. 3. 



Fronds densely tufted, gregarious, arising from a common 

 scutate disc, simple and straight, 5-15 cm. hip-h 5 1 mm. thick, 

 filiform, often spirally twisted, gradually attenuating below into a 

 short stem, and ending in a somewhat blunt apex ； solid when 

 young, but becoming hollow in age. Substance cartilaginous and 

 the plant does not adhere to paper in drying. Colour dark 

 brown, turning" to blackish when dried. 



Hab. Gregarious on rocks at liiph tide. Amakusa-jima, 

 i Nagasaki, Nagato, Tosa, Suruga, Idzu， Sagami, Boshu, Ivvaki, 



Rikuzen. 



Plate XIX. r ig. 1 : Myelophycus ccespilosns in natural state 

 and size. ― Fig. 2 : cross-section of the fertile frond, 3 1 °. —- Fig. 3 : 

 portion of a longitudinal section of the sterile frond, 3 ぜ" ^. —— Fig. 

 4 : portion of a cross-section of fertile frond showing assimilatory 

 filaments and sporangia, ~\ -. ― Fig. 5 : portion of a longitudinal 

 section of fertile frond, ヌ ミ . —— t ig. 6 : assimilatory filaments and 

 a sporagium， — p. ― Fig. 7 : sporangia, 2 -^-°. 



