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Symphyocladia angusta Okam. Algae Jap. Exsicc. No. 22 (\\~fc% 



M 



i in 



Fronds caespitosely rising from fibrous roots, narrow linear, i- 

 1.5 mm rroad, attaining the height of 5-15 cm. They divide near 

 the base giving rise to many main divisions, and are many times 

 more or less irregularly pinnated in disticho alternate manner. Main 

 divisions often appear somewhat dichotomous and pinnately branch- 

 ed assuming pyramidal outline in some specimens ; or branches 

 standing in patent axils reach an equal height, and the entire frond is 

 somewhat flabellate in outline. Pinnae are linear in outline, very 

 patent, straight and not inrolled at apices, and taper to fine points ; 

 they are alternate, regularly pinnulated, and are here and there of- 

 ten very stunted and spinose, either pinnulated or naked, being 

 especially so in lower ones on the stem and main branches. Pinnulae 

 are short, subulate and alternate, and younger ones carry fibrillae at 

 apex ; they are mostly simple, but some are again pinnated with pin- 

 nellae. Stichidia are transformed from pinnulae being aggregated on 

 a short stunted upper pinna and are flabellato-dichotomous ; each is 

 lanceolate, often emarginated at apex, embracing a double row of 

 tetraspores. Cystocarps are unknown. Pericentral cells are 6-8, 

 thickly corticated ; midrib is insignificantly visible in wider portion of 

 branches. Colour is dark purplish-brown, and the plant stains the 

 paper purplish, on which it is dried. Substance is membranous ; and 

 the plant imperfectly adheres to paper in drying. 



Hab.: On rocks between tide marks, widely distributed both 

 along the Pacific side of Hondo and the coast of the Japan Sea ; also 

 in Hokkaido. 



PL. XCVII. Fig. 1 : frond of Symphyocladia gracilis (Mart.) 

 Fkbg. in nat. size. Fig. 2 : portion of a smaller frond, -j-. Fig. 3 ' 

 terminal portion of a pinna, =^. Fig. 4- : surface-view ol the apical 



