'73 



Ahnfeltia concinna J. Ag. 



PL. CXCI, Fig. 1-7. 

 Norn. Jap.: Sainti. 



Ahnfeltia concinna }. Ag. Sp. Alg. II, p. 312 ; Id. Epicr. p 

 207 ; De Toni Syll. Alg. IV, p. 256 ; Yendo Notes on Alg. new 

 to Jap. V, p. 256. Gymnogongrus implicates Kiitz. Sp. Alg. p. 

 789; Id. Tab. Phyc. XIX, t. 69; J. Ag. Sp. Alg. II, p. 312. 



Fronds gregarious, covering a wide range of area, erect, 

 horny, subcylindrical, 5-15 cm high, 1-2 mm in diam., substipitate 

 for a more or less long distance from the base, sometimes quite 

 simple, but more usually divaricately branched upward in a di- 

 trichotomous manner, and provided with proliferous branches, 

 which often arise fasciculately or are arrangad in serund manner. 

 Segments cylindrical or slightly compressed, often corrugato- 

 flexuose, and widely parted with an acute axil. Cystocarps many 

 approximated in upper segments, slightly swollen out forming 

 warty prominences. Colour dark purple or greenish, changing to 

 blackish in drying. Substance horny and the plant does not adhere 

 to paper in drying. 



Hab. : On rocks extending from the mid-tide to little over 

 the high tide mark, covering a wide range of area measuring S-io 

 feet in height. Ogasawarajima, 7 islands of Idzu, Bosyu, Sagami, 

 Ise. 



PL. CXCI, fig. 1-7. Fig. 1 : fronds of Ahnfeltia concinna, J. 

 Ag. in nat. state and size. Fig. 23: cystocarpic fronds in dried 

 state, -J-. Fig. 4 : cystocarpic frond from Saganoseki in dried 

 state, -J-. Fig. 5 : cross-section of branch bearing cystocarp, *. 

 Fig. 6 : portion of the cross-section, ^. Fig. 7 : portion of 

 longitudinal section of branch, 



