38 



Ceramium japonicum sp. no v. 



* * \ ¥ * mm 



Diagnosis. Fronds erect, tufted, cylindrical, throughly corticated, 

 alternately decompound, branching in every direction, subcorymbose 

 with branches elongated and subnaked, decompounded a little above 

 the half way length in sterile frond, which is larger than fructified 

 plant, densely clothed with short ramuli in fructified plant. Braches 

 and especially ramuli often arise fasciculately, with slightly narrowed 

 base, tapering to apex. Cystocarps sessile along the side of ramuli, 

 surrounded by a few involucres, not extending much beyond the 

 neucleus. Tetraspores verticillate around node, immersed, often scat- 

 tered. Articulations almost equal or shoter as the diameter. 



Hab. et Loc. I collected many fructified and sterile plants on 

 the frond of several algaa growing between tide marks, at Noto in 

 April 1895. This plant seems to have a wide range of its distribution, 

 as many specimens were brought from several localities, both along 

 the Pacific side and the coast of the Japan sea, viz. Shima, Totomi, 

 Idzunio, Noto, Otaru. 



Description. Roots fibrous, monosiphonous, branching and expand- 

 ing at extremity, forming a small conical disc. Frond epiphytic on 

 larger algas, tufted, erect, cylindrical, thronghly corticated, tapering 

 and rooting at base, 6-11 cm high in sterile frond, 2 5-5 cm in fructi- 

 fied plant. Ramification is more or less irregularly and divaricately 

 pinnato-deconi pound. Branches arising on all sides, alternate, here and 

 there subsecund, much elongated in sterile plants, usually branching 

 toward apex and the whole ramification is in some measure corymbose. 

 In plants bearing cystocarps, branches are not so elongated as in 

 sterile fronds and are similarly branched toward apex in subcorymbose 

 manner ; and the whole frond is densely clothed with short, subulate 

 ramuli, often arising fasciculately. All the sorts of branches are very 

 patent, more or less constricted at base tapering to apex, which is 

 straight, never being forcipated. Tetraspores immersed beneath cortex, 

 verticillate around the node of unaltered branches, afterward scattered. 

 Cystocarps sessile along the side of ramuli, single or often two seriated 

 longitudinally along the same side of longer ramuli; neucleus, surrounded 

 by 5 or more involucres which are not much longer than neucleus. 

 Articulation subequal as the diameter in the main portion, i-J shorter 



