Oct. Mi6. yr. OKA&ORA.—UNDAR1A AND TLS SPECIES. 267 



northern form is mostly found in Hokkaido and in the north 

 of Kinkazan. This form also occurs in deep waters of the south- 

 ern districts and at the places where tidal currents are in a good 

 flow. In the northern form the stem is mostly long and the 

 sporoptndl is limited at the base of the stem ; thus it is entirely 

 separated from the lamina, both being united only by a long 

 narrow sterile stripe of wing on both sides of the stem as Kjell- 

 mann illustrates in his "Om Japans Laminariaceer " Taf. 11. In 

 the southern form the stem is short and the sporoph}dls become 

 directly continuous with the lamina, and as Prof. Yendo says, 

 "it is not uncommon in Vndaria pinnatiRda, Sur. to find the 

 longitudinal patches of sori which are protruded into lamina 

 from the sporophyll," ]) as the fig. 2 in the plate XI illustrates. 

 Though the sori are often protruded into the lamina at its base, 

 yet they are always separated from each other on both sides 

 of the midrib and never run together. 



2). Hirome undatioides'' has been erected by Prof. Yexdo 

 as the monotypic species of the new genus. It is described 

 with the following diagnosis : 



" Radice fibroso-fasciculata ; stipite brevissimo basi subtere- 

 ti vel compresso mox ancipiti sursum complanato in costam 

 continuante ; lamina tenui, membranacea, bullato-rugosa, punc- 

 tata, cryptostomate prasdita, subpinnatifida, ambitu oblongo- 

 ovata vel cordata, laciniis ovatis ssepe lineari-oblongis sinubus 

 laxis plerumque sursum arcuatis, obtusis, integris vel passim 

 bifidis, summis denique obliteratis ; lacuna mucifera nulla ; sori 

 et in utrisque marginibus costas longitudine fimbriati et in alis 

 stipitis dilatati expansi, collari carnoso-crasso plicis suis stipitem 

 amplectante." — Yendo 1903, I.e. 



Of this alga I have not many new facts to add to what is 

 said by him. His materials, however, seem to have been young 

 plants as it may be inferred from the presence of sori on both 

 sides of the midrib. A specimen collected by Mr. Ida at Funa- 

 kata, Prov. Boshyu, late in April, this year, has ripen no sorus 



1) Yespo: Three New Marine Algae from Japan, p, 100 (The Bot. Mag. Tokyo, 

 Vol. XVII, 1903). 



2) Yendo: 1903, I.e. p. 99, PI. II, fig. 1-2, PI. Ill, f. 4-9. 



