220 



pleted a two years' tour of the principal herbaria of Europe in 

 order to examine the specimens on which the Japanese species had 

 been founded or recorded. *'Tosaka" was familiar enough to 

 Prof, Yendo, who stated that its scientific identity had iiever 

 been effected in Japan, but that in his '' Text Book of Marine 

 Botany " he had provisionaMy and doubtfully referred the plant 

 to Meristotheca papulosa, though it diifered materially from the 

 description of that species. During his stay in Europe he had 

 found specimens of the plant in question in many herbaria, and 

 under various names. The examination, however, of the co-types 

 at Dublin and Lund did much to remove the doubt expressed in 

 his text-book, and on returning to the Continent in February, Dr. 

 Yendo wrote that he had clinched the point by an examination of 

 Montague's original specimen in the Paris Museum. As this is 

 now established, and as it is unlikely that any earlier specific name 

 for the plant will be discovered, the new combination Eucheuma 

 papulosa may be formed, the formal description of which is as 

 follows : — 



Eucheuma papidosa, Cotton et Yendo, comb, nov., Callymenia 

 papulosa, Mont. Pugiilus Alg. Yemens No. 21 (Ann. Sci. Nat. ser. 

 3. t. xiii, 1850, p. 246); J. Ag. Sp. ii. p. 293. Euhymenia papu- 

 losa, Kutz. Tab. Phyc. xvii. Tab. 73, fig. 2. Menstotheca 

 papulosa, J. Ag., Bidrag Fl.Syst. p. 36, partim, excL syn. ; Yendo, 

 Text-book^ of Marine Botany pp. 622-630, figs. 177 and 178. 



Pronds springing from a discoid base, with a short stem soon 

 expanding and dividing into many segments. Total height, 

 15-20 cm., very irregular in general outline but cordate or reni- 

 form when fully developed. Colour when fresh deep rosy brick 

 red. Segments plane, thick and fleshy, 5-8 cm. long, 2-5 cm. 

 wdde, irregularly dichotomous : margins at first entire, later 

 giving rise in a pectinate manner to copious proliferating^ 

 branohlets. Antheridial and cystocarpic plants usually rugulose 

 on the surface. Cystocarps sessile, globose, intermixed with 

 short subulate processes, marginal, or in irregular clusters on sur- 

 face. Antheridia similar in shape and in position to cystocarps 

 but destitute of subulate outgrowths. Tetraspores scattered all 

 over the frond, imbedded in the epidermal layer, zonately divided, 



small, 18-20 x 9-10 p. 



Distribtition. — Hed Sea, Somaliland, ^Formosa, Japan, Guade- 

 loupe (?), Sandwich Islands. 



The external appearance of the plant is extremely variable 

 according to the age and mode of branching. In the simpler 

 forms the frond is flat, dividing into broad linear segments with 

 wide axils; in the more complicated, the general aspect resembles 

 that of Halymenia formosa. The surface of the principal seg- 

 ments of sexual plants is usually rugulose and the margin 

 verrucose and irregular owing to the presence of reproductive 

 bodies. The tetrasporic form has a smooth surface and is gene- 

 rally more copiously^ branched. In sotne specimens the frond is 

 spotted with deep crimson flecks and in others it is homogenously 

 crimson red. The subulate processes amongst the cystocarps are 

 characteristic of the species, though they occur also in a doubtful 

 ally E. SchraTnmii, J. Ag. 



