﻿PLATE IX, 

 Digenea simplex (Wulf.) Ag. 



RHODOMELACE/E. 



Nom. Jap. Makuri, Kaininso. 



Digenea simplex J. Ag. Sp. II, p. 845 ； Hauck Meeresalg. p. 215, 

 fig. 93 ； De Toni Phyc. Jap. Nov. p. 32 ； Heyclr. Beitr. Algenfl. Ost 

 Asien, p. 296 ； Harv. Ner. Bor. Amer., II， p. 30, Tab. XIII. D ； 

 Schmitz et Falkenb. in Engl. et Prantl Naturl. Pflanzenfam., p. 437, 

 fig. 245 ； Okam. Alg. Jap. Exsic. Fas に I， No. 24. — D. Wulfeni Kiitz. 

 Phyc. Gener" p. 433， Tab. 50， II; Id. Sp. Alg., p. 841. ― Fticiis Ly- 

 co お odium Turner Fuci, t. 199. ― Cladostephus Lycopodimn J. A?". Sp. 

 I, p. 42. 



Fronds coespitose, rising from an expanded disk, cylin- 

 drical, 2-3 mm. thick, 5-2 5 cm. high, irregulary branched in 

 an alternato-dichotomous manner, with segments between erect 

 and patent, of equal height in some specimens, in others one 

 much longer than the other ； the whole frond, except denuded 

 base, is everywhere thickly covered with a profusion of very 

 patent, filiform, simple or sometimes sparingly branched, harsh, 

 ramuli of the thickness of 80-1 50 ド and of the length of 5-10 

 or sometimes j 5 mm. Hamuli, when viewed under microscope, 

 show jointed appearence with the pellucid dissepiments, with the 

 articulation externally consisting of regularly disposed lonp-itudinal 

 sets of tesselated cortical cells, and internally of some 10 pericentral 

 cells, and terminated with deciduous fibrillae. The length of 

 articulation of ramuli is subequal to the breadth. Tetraspores 

 are formed in a twisted row in the upper somewhat swollen 

 portion of ramuli which shows warty uneven surface. Cystocarps 

 are oval, sessile, fixed on the side of upper or middle portion of 



