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Chondrus elatus Holmes. 



Nom- Japi : Kotodzi-isunomata or Naga-tsunomata. 

 PL. CLX, Fig. 6-14. 



Chondrus elatus Holms On Mar. Alg. fr. Japan, 1895, p. 252, t. IX, I ; 

 De Toni Syll. Alg. IV, p. 182. Chondrns platynus $ elongatus Martens 

 Preus. Exped., Tange, p. 118? 



Fronds caespitose rising from callous disc, tereti-compressed, 

 rather linear, 3-4 mm thick, ca. 15-25 cm high, many times (5-6 

 times) distantly dichotomous above the halfway of the whole length, 

 with widely parted and roundish axils. Branches obtuse or bifid 

 at apex, equally broad or slightly narrow at base, with or without 

 short, simple or mostly once forked ramuli which arise from both 

 margins in almost horizontal direction, sometimes solitary, some- 

 times seriated in some number. Segments bearing fruits become 

 sometimes slightly torulose, but mostly remain entire. Cystocarps 

 usually formed in upper branches, slightly prominent on both 

 surfaces, large, elliptical and ocellate. Tetrasporic sori forming small 

 oval specks densely scattered over the terminal branches, immers- 

 ed beneath cortex. Color dark .purplish red with brownish tinge. 

 Substance cartilaginous and the plant becomes rigid in drying. 



Hab. : On rocks between tide marks. Pacific coast from 

 Prov. Totomi to Prov. Rikuchyu. 



Martens describes in his /. c. Chondrus platymis $ elongatus 

 get at Yokohama with the diagnosis : " fronde basi tereti, dicho- 

 toma, angusta, elongata." This I think most probably to be same 

 as the present plant, though I do not see any specimen of it. ' 



PL. CLX, fig. 6-14 Fig. 6: sterile frond of Cliondrus elatus Holm., 

 \. Fig. 7: tetrasporic fronds, \. Fig. 8: cystocarpic branch, \. Fig. 9: 



