5 : procarp (trichogyne is not bent in natural state), s f- 7 . Fig. 

 7-8 : portion of longitudinal and cross sections of cystocarp, dia- 

 gramtic. 



Plocamium costatum (J. Ag.) Hook, et Harv. 



Nom. Jap. : Kizami-yukari. 

 PL CXCVIII, Fig- 1-4- 



Plocamium costatum (J. Ag.) Hook, et Harv.; Yenclo Notes 

 on Algae New to Jap. VIII, (Bot. Mag. Tokyo, vol XXXII, n. 

 376, p. 68, 1918); Harv. Ner. Aust. p. 122 partim ; Kg. Sp. Alg. 

 p. 886; Id. Tab. Phyc. vol. XVI, t. 52, f. d-e; }. Ag. Sp. Alg, II, 

 p. 403 ; Id. Epicr. p. 344 ; De Ton! Syll. Alg. IV, p. 597. 



Only one specimen now before us. Frond flat, linear, thin 

 membranaceous, about 7 cm. high, scarcely i mm. broad, gently 

 flexuose. Branches distichous, 2-4 times decompound pinnate, alter- 

 nate and erecto-patent, the lower ones longer than the upper and 

 gradually becoming shorter above, so that the outline is somewhat 

 corymbose ; they are throught alternate in geminate manner (/. e. 

 two on one side and as many on the other), of which the lower 

 one is always simple, while the upper decompounded ; the simple 

 one 2-3 mm. long, tapering to a fine point from broader base, 

 widely parted in lower or middle ones, and more or less incurved 

 in upper oies. The lower simple lacina of geminate ones fur- 

 nished with microscopically minute teeth-like serrations along the 

 outer margin. Sporophylls forming divaricato-dichotome stellate 

 clusters provided with a short pedicel composed of sublanceolate 

 or linear ramuli, which is transformed from lacinulae. 



Hab. : Kotosho (Taiwan). 



