Bostrychia Andoi Okam. n. sp. 



Nom. Jap. : Tani-kok'emodoki. • 



PL. XXII， Fi-s. 14-22. 



Bostrychia Andoi 岡 村， Fl 本 藻類 名彙 p. 232. 



troncis filiiorm, densely tufted rising from prostrate creepm?" fila- 

 ments with vaguely branched sep-ments which are entangled top'ether 

 by means of root-fibres emitted from the places where branches come 

 in contact with one another. Plant attains a heip"ht of 10 20 mm. and 

 its thickness measures So- 120 in thicker portion, while 60-72 "- for 

 the most parts and 40 ！丄 at the apical portions. Pericentral cells 

 which are throup-hly ecorticated vary from 4 to 5 accordinp- to the 

 thickness of branches and two pericentral cells correspond to one 

 central cell. Younp^ ramuli and apical portions of thicker branches 

 remain monosiphonous, colour dark vinoso-brown. Substance soft 

 and membranous and the plant does not adhere to paper In ciryinp*. 



hath ： On stones in a torrent in a hilly district 5 miles from the 

 sea ； Riukiu. 



This distinctly new fresh-water species of Bostrychia was collect- 

 ed by Mr. K. Ando, 4 Oct 1901, in a torrent in a hilly district 5 miles 

 from its mouth at Daikumata in Kunchan District in Riukiu. He 

 wrote to me as follows : — " this plant grows on stones in a quiet 

 stream below a cascade and it does not o^row either on too small 

 stones or on too anovular ones. It abounds in shady places. Although 

 it is found in still water, the tuft of frond does not'stand erect but bends 

 with stream. 



