261 



furcellata 



Species complanata, membranacea, inediocris magnitudinis. 

 From stratis duabus, interiore filis angustis laxe intextis, 

 exteriore cellulis rotundato-angulatis in membranam unistratosam 

 acte concretis. Venae nullae. Rami breves, decomposite* dicho- 

 tomi divergentes, 5-10 mm. lati, apicibus subacutis non attenu- 

 atis. Cystocarpia minuta, plerumque secus margines disposita. 

 Tetrasporangia ignota. Color roseus. 



Japan. Enoura, Saido, 9. In Herb. E. M. Holmes. 



The present plant though resembling certain forms of S. 



furcellata, Biv., is evidently distinct from it. The very thin 

 flattened fronds, their bright colour, and diverging branching, 

 mark external differences, whilst in structure the entire absence 

 of veins is a distinctive feature. Judging from the two specimens 

 which have been examined (that of Collins and that of Saido) the 

 plant is also decidedly smaller. 



The note by Collins on Phyc. Bor. Amer., No. 836, stating that 

 " the frond is flattened throughout, even when quite fresh," is of 

 value in confirming the claim of this plant to specific rank. 

 Although in Herbaria forms of $. furcellata often appear flattened, 

 in the living state the fronds are found to be invariably 

 cylindrical. 



Scinaia complanata is at present known from two localities, 

 Indian River Inlet, Florida, and Enoura, Japan. 



* 



The identity of Okamura's Alg. Jap. Exsicc. No. 2, and similar 

 Japanese specimens, with S. furcellata of Europe, is, in the 

 opinion of the writer, very doubtful. Dried material of the plant 

 W so difficult to deal with, that a description of the structure, from 

 living or carefully preserved material, is highly desirable. 



Gigartina prolifera, Harlot ; Alg. de Yokoska, p. 220 ; De Toni 

 Syll. Alg., vol. iv., p. 211. 



Corea. Port Hamilton, Wilfred, No. 732. In Herb. Hooker. 



The only record of this species appears to be that by Hariot in 

 1891. In general habit the plant resembles G. mamillosa, J. Ag., 

 young specimens of which might be confounded with it. The 

 surface of the frond however remains entirely free from papillae, 

 and the cvstocarps, which do not appear to have been observed 

 by Hariot, are embedded in more or less regularly arranged 

 marginal proliferations. In some specimens these proliferations 

 give the frond an almost pectinate appearance. 



Callophyllis crispata, Oka) a. ; Contrib. Mar. Alg. Jap., ii. p. 21, 

 tab. 3, fig. 1-2 ; De Toni Syll. Alg., vol. iv., p. 286. 



Japan. Shimoda, Saido, No. 47. In Herb. E. M. Holmes. 



Though only known in Britain by the original reference 

 this species is readily recognised. It approaches 0. lemmata, 

 Ktitz., of Europe, and if Saido's specimens may be considered 

 typical, it has, in addition to the differences mentioned by 

 Okamura, a decidedly thicker frond. 



