Notes on Algae New to Japan. V. 



By 

 JiicliisalMiio Vc'iulo. 



Ulva rigida Ac. 



Spec, p. 410.-1(1.: System. Alg.. p. 189.— J. Ac: Till Alg. System., 

 M, J). 164, p.p. 

 = Ulva lactuca Wulf. : Crypt. Aquat., p. 3. 

 = UIva Lactuca o. rigida Le Jolis: Alg. Mai'. Clicrb., ]>. oS. 

 -Ulva Lactuca var. rigida Ardiss.: Phyc. Alcd. I, p. 193. 

 = Ulva Lactuca f. rigida Dk Teni: Syll. Alg. I, p. 111. 

 — Ulva Lactuca Heydk.: Beitr. z. Kennt. Algenfl. v. Ostas. p. 272. 



(Iledwigia, Bd. 33). — Id. : Einige Algcn v. den Loochoo Ins., p. 



100. 

 = Ulva conglohata Kjellm.: Mar. Clilorophyc. fran Jai)an, \). 10, 



Tab. 2, Hg. 1-7, Tab. 3, fig. 9-14.— Ok.\m.: Alg. Exsc. Jap., No. 



92. 

 =^Ulva fasciata f. ca:spitosa Setch. : Phyc. Bor.-Amer. No. 809. — 



Collins: Ulvaccae N. Anier., p. 10. —Id.: Green Alg. N. Amer., 



p. 217. — Weber van Bossk: Liste des Alg. du Siboga. I, j). 51. 



The specific limitation of Ulva rigida Ag. taken I33' various 

 authors, as far as I can understand, seems to be quite uncertain. 

 Lk Jolis regarded it a forma of U. Lactuca L. His specific con- 

 ceptions of Ulya and Enteromopba arc so broad that no recent 

 botanists dare to fiillow him. Still the name U- Lactuca var. 

 rigida Le Jolis is often mentioned in current literature. 

 Hauck also included C. Agaedh's species under U. Lactuca L. 

 its f. gcnuina. 



A carefuU study of the specimens ke])L in the Agardhian 

 Herbarium under U. rigida Ag., consulting the statement by J. 



