114 THE BOTANICAL MAGAZINE. [Vol. xxix. Xo. afe. 



characterized by having always two indifinite branches in an 

 internode. In the present paper the specific limitation is taken 

 after J. Agardh. The other form found mixed among the 

 authentic specimens of P. leptophyllum Kutz. is undoubtedly a 

 forma of P. coccineum. 



P. leptophyllum in J. Agardh's sense has often the definite 

 branches curved downward. P. hamatum J. Ag. is nothing but 

 such form which has this sort of branch markedly pronounced. 



Locality. Mikawa Prov. (!); Hizen Prov. (K. Oshima, No. 16). 



Distribution. Norfolk Island ; New Zealand ; Tasmania. 



Plocamium coccineum var. flexuosum Hary. 



Ner. Austr. p. 124, PI. 43, fig. 2.— Id.: New Zealand Alg. No. 

 356J. 

 =P. leptophyllum var. flexuosum J. Ac Spec. II, p. 396. — Id.: 



Epicris, p. 339— De Toni : Svll. Alg. IV, p. 589. 

 =P. oviforme Ok am.: in De Toni : Svll. Alg. IV, p. 590.— De Toni : 



Nouva Notarisia, 1897, p. 26.— Oram.: Icon. Jap. Alg. Ill, PI. 



CIII, fig. 1-5. 

 =P. ovicornis Okam. Contrib. Mar. Alg. Jap. II, p. 23, PI. Ill, fig. 



3-4, 

 = P. leptophyllum Kutz.: Tab. Phyc. XVI, Taf. 45, fig. a-c. 



The type specimen of the present variety at Dublin and the 

 original of P. leptophyllum var. flexuosum J. Ag. at Lund 

 (authentic specimen of Harvey's) have the indefinite branches 

 invariably three. This character proves a close affinity to P. 

 coccineum and not to P. leptophyllum Kutz. Hence, the name 

 proposed by Harvey shall be better restored. 



The present variety has very often small adventitious 

 ramulets on the opposite side of the normal branches. This 

 form has been illustrated by Kutzing as Tab. Phyc. XVI, Taf. 

 45, fig. a-c under P. leptophyllum and by Okamura in the re- 

 ferrences above mentioned under P. oviforme or P. ovicornis. 



The report of P. coccineum and its variety from Japan and 

 adjacent regions seem to have been based on plants either refer 

 rable to this or to the preceeding species. 



