July 1009.1 YESDO. -NOTES ON ALGJS NEW TO JAPAN. 127 



and 9 cm. in width. The other characters exactly accord to 

 the description of the above mentioned forma. 



There is a much smaller, monostromatic form growing mixed 

 with the above mentioned. It is crcnulated at the margin and 

 has thinner shade of colour. The average thickness of the frond 

 measures 35 //. I have never found a fertile specimen of this 

 small form. It ma}' perhaps be a young stage of the distromatic 

 f. amplissima ; at the same time it is to be noted that it accords 

 pretty well with the difinition of f. ahyssicola Rosenv. Hus 

 describes the latter to have 25 fi in thickness while the measure- 

 ment on the figures given by KjEIXMAN in his Alga? of the 

 Arctic Sea, PI. 18, fig. 11, affords ca. 42 fi as the thickness. 



Loc. Hakodate ; Otaru. 



Porphyra laciniata Ag. 



System. Alg. p. 190.— Id;. Icon. Alg. Europ. Tab. 27.— IIarv. : 

 Phyc. Brit. PI. 92.— J. Ac; Till Alg. Syst. VI. p. G7.— Bokn. ct Thur.: 

 Etud. Phyc. p. 58.— Faklow : Mar. Alg. New Eng. p. 111.— Hus : 

 Prelim Notes Porphyra. p. 02.— Id.: Account Porphyra. p. 196. 



= Ulva laciniata Lightf.: FI. Scot. p. 874. Tab. 33. 



= Wildemania P laciniata Die Toni : Syll. Alg. IV. p. 20. 



I identify our plant with the above mentioned species by 

 comparing our specimens with that which was sent from BoR- 

 GE9EN with the specific name, ccllcctcd at Fredrikshaven. They 

 are indcntically equal, and accord very well with the descriptions 

 ever published. 



lies states that " the color of the fronds is fairly constant, 

 being as a rule an even grey purple, which increases in density 

 with age." Our specimens, however, an- greenish purple while 

 young and reddish purple when matured. In this respect ours 



are more like European plants. lie also remarks that the planl 

 is mostly dioecious, though sometime- monoecious. In i ur 

 specimens some are dioecious hut in many cases monoecious. 

 It is worthy of mentioning that, in our specimens, when monoe- 

 cious, the carpogonal and the antheridial area are always 



