190 THE BOTANICAL MAGAZINE. [Vol. xxxi. No. 367. 



iu external appearance. The principal stem is 0.15-0.17 mm 

 in diameter, with long and finer branches from all sides of 

 its middle part and upward, the lowest branches being longest. 

 The branches issue minor branches again and the ultimate 

 branchlets are provided with fasciculate ramenta. In some 

 specimens, the principal stem is not markedly different in 

 thickness from the branches but in others more or less distinct. 

 The lower branches are frequently destitute of the subordinate 

 branchlets, remaining .as simple, long, slender filaments. J. 

 Agakdh remarks :— Speciem ad Br. hypnoides proxime ac- 

 cedentum puto, quasi hujus forman maxime contractum 

 exhiberet." The resemblance between these two species, how- 

 ever, is simply in the mode of ramification. In habit and in 

 size, both exhibit quite different characters. 



A finer form of the present species may often be taken as 

 to stand close by B. secunda J. Ag. The latter is, however, to 

 be separated by having the branches nearly equal in length, 

 giving a linear general outline to a frond. 



Locality. Hizen Prov(!); Higo Prov(!); Shima Prov.(!); 

 Sagami Prov.(!). 



Distribution. Mediterranean Sea. 



Bryopsis plumosa f. corticulans (Setch.) tioy. nom. 



= Bryopsis corticulans Setch. : in Coll., Hold, et Setch. : Phyc. 

 Bor.-Amer., No. 626.— Setch. et Gardn. : Alg. N. W. Amer., p. 

 230.— Collins : Green Alg. N. Amer., p. 230.— Id. : Mar. Alg. 

 Vancouver Isl., p. 106. 



Oltmanns 1} delineates a branch of B. plumosa Ag. (under 

 B. cupressoides) with some rhizoidal filaments. In a specimen 

 collected at Pacific Grove, California, by Mrs. Fellow and 

 sent to me from Mrs. Snyder under B. corticulans, the cortica- 

 tion is about in the same degree. Such rhizoidal processes as 

 shown by Oltmanns are frequently found in the European 

 specimens, most so in those which are referrable to B. plumosa 



1) Morphol. u. Physiol. Meeresalgen, T, fig. 189. 



