114 - 



hairs, '= i j. Fig. 5: cortical cells at geniculus, ^f--. Fig. 6: root-fibre, 

 :; -. Fig. 7 : tetraspores, -^-. 



Cerainium paniculatum Okam. 



Norn. Jap : Hari-igisu. 

 PL. CLXXIX, Fig. 8-16. 



C. paniculatum Okam. Contr. Knowl. of the Mar. Alg. of Jap. II 

 (Bot. Mag. Tokyo, Vol. X, 1896, no. Ill), p. 36, pi. Ill, f. 22-23 ; Okam. 

 Alg. Jap. Exsic. n. 2. 



Fronds densely tufted, forming subglobose mass, capillary, ca. 3 cm. 

 high, 130-200 ,"- thick, subdichotomo-alternately decompound, shooting 

 forth lesser sorts of branches in every direction. The basal portion of 

 frond lying on substratum emits from nodes monosiphonous root-fibres 

 which are mostly simple or distantly branched, ending in a blunt apex 

 or expanding into a small conical disc. Branches short, patent, often 

 almost horizontal, of subequal length for the most part, becoming shorter 

 above with short similarly arranged ramuli. The entire ramification is 

 thus a panicle. Ramuli very patent, armed with a subulate, 2-4 celled' 

 coloured spine at each node longitudinally seriated along the external side ; 

 the lower ones often slightly recurved, some forcipated at apex, others 

 simple and straight ; the upper ones often unequally forcipated and a 

 little recurved at extremity, becoming very patent afterwards. Articula- 

 tions little shorter as the diameter in the basal portion of frond, 1J-21 

 times long in the median portion, becoming shorter above. Node 

 corticated and subequal, not being prominent, leaving interstices hyaline. 



