still smaller ramelli on their upper sides. Tetrasporangia are 

 formed in sporophylls which are seriated along the axils ; sporo- 

 phylls are in some almost simple or sparingly branched, in others 

 much branched in stellate manner or dichotomo-dccompound, with 

 sublanceolate or linear ramuli and sustained with a short pedicel 

 and contain double rows of zonate tetraspores. Cystocarps glo 

 bular and sessile formed on the sides of branches. Colour a 

 beautiful red. Substance thin membranaceous, somewhat soft car- 

 tilaginous in robust ones and the plant adheres to paper in drying 

 except robust ones. 



Remarks: In making the identification of the p.^sent plant I 

 have not been able to see any reliable specimens except the lit- 

 erature quoted above. Plant enumerated in Martens' Preus. Exped* 

 n. Ost-Asien, Bot., p. 119 under the name Plocamium affine Kg 

 which was collected on Capca Richardiana at Yokohama is most 

 probably same as the present plant. So also Plocamium botryoides 

 determined by Heydrich (Einige Algen von den Loo-choo- oder 

 Riu Kiu-Inseln p. 103; Kuroiwas No. 57) from Ryukyu specimen 

 sent by Kuroiwa, who put many specimens under my disposal in 

 common with Heydrich, as I judge from the identity of the num- 

 ber denoting his specimens. 



Forma uncinatum Okam. n. f. 

 PL. CII, Fig. 1-2. 



Fronds more or less loosely branched with ramuli recurved and 

 uncinated. 



Hab. : On rocks, stones etc between tide marks in calm 

 places and in the depth of 3-16 fathoms. Ko-tosho (Tai-wan), 



Correction . PL. CII : for Plocamium abnonne If. et H. var, uncinatum 

 read PI, nbnonne II. et II. f. uncinatum. 





