apex. Tetraspores and cystqoarps densely collected in thin and small 

 roundish sporophylls mostly seriated along both margins. 



Hab. vOn rocks, shells and stones in deep water. Sagami, Boshu, 

 Kaclzusa, Hitachi. 



Description : Frond 20-50 cm high, coespitose, linear, ancipito-com- 

 pressed, dichotomo-decompouncL Segments linear, 1.5-2.5 mm in breadth, 



either equally broad for a great distance, or here and there constricted 

 with patent and roundish axils, ending in blunt or bifid apex. Prolifer- 

 ations similar in appearence and substance to the remaining portions, 

 arising from margin and apex. Sporophylls, thin and small, obovate or 

 oblong, tapering at base, seriated along both margins and rarely produced 

 from surfaces. They leave minute prominences after falling away. Sub- 

 stance rio'id-cartilaainous. becoming almost horny in drying. Colour red. 



Bemarl's: Plant closely related to Prionitis august a. as I have 

 remarked under that specie?. Pr. angusta bears both kinds of fruits at 

 the same time in mostll roundish lateral branchlets or sporophylls and in 

 the terminal segments beneath the apex. Cells of the intermediate 

 layer of Pr. data are larger and more roundish and are more distinctly 

 marked out from those of the cortical layer than is the case in Pr. angusta. 



Prionitis articulate Sp. nov. Fig. 3-4. 



Description: Frond plauo-compressed, shortly stipitate, irregularly di- 

 polychotomous by repeated proliferations from apex and sides, 15-20 cm. 

 high. Segments strongly constricted into cuneate, elliptical or clubate 

 internodes, 2-3 cm. long, 3-7 mm. in breadth. Tetraspores forming sori 

 in thin and minute roundish or oblong sporophylls abundantly produced 

 from surfaces and margin?. Cystocarps... Colour deep red. Sub- 

 stance rigid cartilaginous, becoming almost horny in drying. 



Hab. Mikawa, Shima. 



Bemarhs : The external appearence of this plant is in some measure 

 similar to Pr. Andersoniana, on account of the articulated segments. 

 The substance, structure and sporophylls are similar to Pr. data with which 

 the present plant seems to be related. It differs from that species in 

 size, breadth and appearence of frond and in the position of sporophylls, 



