91 



Cerarnium japonicum Okam. 



Norn. Jap. : Ham-igisit. 

 PL. CXXIV, Fig. 14-22. 



Ceramium japaiiicum Okam, Contr. to Knowl. of the Mar. 

 Alg. of Japan II. (Bot. Mag. Tokyo. Vol. X., No. in) p. 38. PL 

 III, f. 24-28. 



" Roots fibrous, monosiphonous, branching and expanding at 

 extremity, forming a small conical disc. Frond epiphytic on larger 

 algae, tufted, erect, cylindrical, throughly corticated, tapering and 

 rooting at base, 6-n cm high in sterile frond, 2.5-5 cm ' n fructi- 

 fied plant. Ramification is more or less irregularly and divaricately 

 pinn'ato-decornpound. Branches arising on all sides, alternate, 

 here and there subsecuad, 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, which often arise fas- 

 ciculately. All the sorts ot branches are very patent, more or less 

 constricted at base tapering to apex, which is straight, never being 

 lorcipated. Tetraspores immersed beneath cortex, verticillately 

 around the node of unaltered branches, afterward scattered. Cystc- 

 carps 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, l /2- l /i shorter in basal portion of frond and in ramuli ; 



