jui.v, iftiT.] K. YENDO.— NOTES ON ALGAE NEW TO JAPAN. VII. 187 



Locality. Otaru Bay(!). 



Distribution. New Foundlancl to Rhode Island. 



Monostroma fuscum Wittr. 



Monostroma, p. 53, PI. IV, fig. 13.— J. Ac: Till Alg. System. 

 Ill, p. 113. — Hauck: Meeresalgen, p. 425. — Wittr. et Nordst. : 

 Alg. Exsic, No. 143.— Kjellm. : Alg. Arct., p. 199.— De Toni : 

 Syll. Alg. I, p. 109.— Foslie: Mar. Alg. Norway, Contr. I, p. 118. 

 — Rosenvenge: Grdnl. Havalger, p. 940 (excl. synon.). — Id.: 2'me. 

 Mem. Alg. Mar. Greenl. p. 116. — Coll., Hold, et Setch.: Phyc. 

 Bor.-Amer., No. 715. — Setch. et Gardn. : Alg. N. W. Araer., p. 

 208. — Collins : Ulvaceae N. Araer., p. 11 (excl. synon.). — Id. : 

 Green Alg. N. Amer., p. 213 (excl. synon.). 

 = Ulra fusca P. et R. : 111. Alg., p. 21, PI. 37— Kutz.: Spec. Alg., 



p. 475. 

 = Ulva sordida Aresch.: Phyc. Scand. Mar., p. 187, Tab. I, fig. 



H.— Id. : Phyc. Nov., p. 371.— Id. : Alg. Scand. Exsic. Ser. Nov., 



No. 120.— Radenh.: Alg. Eur., No. 1606. 



There are six sets of specimens as the type of Ulva fusca 

 P. et R., kept in the Herbarium of the Academy of Science of 

 St. Petersburg. They differ very much from one another that 

 a concrete limitation of the species is difficult to catch from 

 them. Some of them have monostroma tic fronds and some 

 distromatic. The modern specific conception of Monostroma 

 fuscum is mainly grounded on the description given by Witt- 

 rock. Rosenyenge extended the limitation as to comprise M. 

 Blyttii WlTTR. and M. splendens Wittr. as its formae, and 

 Collins adopts the view. I have also reported the occurrence 

 ol M. splendens under a formic name of M. fuscum, as I have 

 not seen the type at that time. The authentic specimens of 

 thoe three species, however, seem to me well defined, and my 

 specimens fully agree with Wittrock's M. fuscum. 



Locality. Otaru Bay(I); Muroran(l). 



Distribution. North Atlantic; North Pacific. 



