278 THE BOTANICAL MAGAZINE. [Vol. xxix. No. 346. 



rangien auf dem gefliigelten Stipes. Er diirfte von einer Phyllaria- 

 Form sich entwickelt haben, welche wie L. Peterseniana geflii- 

 gelten Stipes hatte. Und andererseits diirfte Pterygophora wahr- 

 scheinlich durch irgend eine mit Saccorhiza analoge Form, in 

 genetiseber Verbindung mit L. Peterseniana stehen." 1} 



Prof. Yendo says " Our plant [Hirome undarioides] would 

 stand closer by Undaria pinnatiBda than Pleurophycus Gardner! 

 Setch. et Saund. stands by Laminaria Peterseniana Kjellm. and 

 L. radicosa Kjellm." 2) Undaria Peterseniana might have origi- 

 nated from Pleurophycus or Phyllaria form; I am, however, at 

 the present knowledge, in opinion that it has developed through 

 Undaria uudarioides to Undaria pinnatiAda var. distans, though 

 I should have to offer another solution of the problem when 

 Drew's recent observation 3 - 1 on gamate nature of a Laminaria 

 is firmly established and reveals the truth. 



Explanation of figures in PL XI. 



Fig. 1: Younger frond of Undaria pinnaiifida S(JR. / typicaY endo with less-pinnately- 



lobed lamina, ^. 

 Fig. 2 : Basal portion of frond of Undaria pinnatifida Sur. / iypica Yendo showing 



long patches of sorus, s, protruded into lamina from sporophylls, J. 

 Fig. 3: Fully-matured and fructified frond of Undaria undarioides (Yendo) Okam., 



showing the continuation of sorus, s, s, from sprophyll to the basal portion 



of frond, J. 

 Fig. 4 : Typical form of Undaria Peterseniana (Kjeldm.) Okam ; s, sorus ; \. 

 Fig. 5 : Roundish form of frond of Undaria Peterseniana (Kjedxm.) Okam.; s, sorus; %. 

 Fig. 6: Oblong-shaped frond of Undaria Peterseniana (Kjedlm.) Okam. showing the 



continuation of wing with undulato-plicated base of lamina ; s, s, sorus £. 



1) Kjeedm. och Petersen: Om Japans Laminariaceer, 1885, p- 260, quoted in 

 German in Bot. Jahresbericht 13th Jahrg. 1885, p. 408, 



2) Yendo : The Three New Mar. A Ig. f. Japan, p. 102. 



3) Drew: Reproduction and Early Development of Laminaria digitata and L. 

 S.iccharina. Ann. of Bot. XXIV, No. 93, 1910. 



