846 ConjugatiB, DesmidiaceaB, Clostorium. 



p. 9. t. I, f. 8. — Validiim, plus minus curvatum, semilunare, 

 ."^6-55 (raro ad 72 y..) latum, diam. 5-9-plo longius, latere ven- 

 trali medio gibboso-tumido, apicibus plus minus incurvis obtuso 

 rotundatis; pyrenoidibus in serie unica axili dispositis, in utraqne 

 .semicellula 7-10, conspicuis; locello apicali submagno, corpuscula 

 numerosa includente; membrana hyalina, striis semper (ut videtur) 

 destituta; sutura haud evidente. 



Hah. in fossis, stagnis et paludibus iii Italia (Delponte, De- 

 NoTARis, De-Toni, Levi), Gallia (Brebisson, Petit), Germania 

 (Rabenhorst, Klebs), Austria (Grunow), Hungaria (Istvanffi), 

 Bohemia (Hansgirg), tota Britannia (Archer, Hassall, Ralfs, 

 Cooke), Suecia (Cleve, Lundell), Norvegia (Nordstedt), Rossia 

 (Artari) et Lapponia rossica (Nordstedt), Fennia (Elfving), Ame- 

 rica boreali (Wolle), America australi (Nordstedt, Wille), ins. 

 (( Banka » (Grunow), Sibir-ia (Boldt) et Japonia (Roy, Bisset), ad 

 fl. « Waimakariri » in Nova Zelandia et ad « Oahu » insularum 

 sandwicensium (S. Berggren sec. Nordstedt). — Huc otiam va- 

 rietates a me non visas ex opere Rabenhorstiano transcribo. — 

 Var. minus Kuetz. Species p. 163, Rabenh. FI. Eiir. Algar. III, 

 p. 132, Closterium ornatum Rabenh. Krypt. Flor. v. Sachs. 

 p. 171 : minus, diam. 28 y.., apicibus acutissime acuminatis. — 

 Var. angulatum (Hantzsch) Rabenh. Fl. Eur. Algar. III, p- 132, 

 Closlerium angulatum Hantzsch in Rabenh. Alg. n. 1112!: 

 paullo minus (quam forma typica), gracilius, leviter curvatum, 

 ventre subacute infiato, diametro (plerumque 30 a.) 6-pIo longius; 

 zygotis globosis vel ovalibus, magnitudine forma? typicas zygota 

 jequantibus. — • Var. Thureti, de qua cl. de Brcbisson (Liste p. 149) 

 disputavit, nihil aliud nisi status divisionis esse videtur. 



73. Closterium Leibleinii Kuetz. Synops. in Linn. 1833, p. 596, Sp. 2025 

 Alg. p. 163, Breb. Alg. Falaise p. 58, t. VIII, Liste p. 150, Me- 

 negh. in Linn. 1840, p. 232. Ralfs Brit. Desmid. p. 167, t. XXVIII, 

 f. 4, Rabenh. FI. Eur. Algar. III. p. 132, Cooke Brit. Desm. p. 25, 

 t. 13, f. 1, Wolle Desm. U. S. p. 46, t. 7, f. 13, 20, Delp. Desm. 

 subalp. p. 9S, t. 17, f. 1-6, De-Toni e Levi Fl. Alg. Ven. III, 

 p. 33, Closlerium monili/eram f. Leibleiniana Jacobs. AperQu 

 p. 170, Closterium moniliferum b. Leiblcinii Klebs Preuss. Desip. 

 p. 9, Closterium Lunula Leibl. in Flora X (1827), p. 259 (fide 

 Kuetzing!), Rabenh. Alg. 507, 849, 1230 a! et sub. n. 1337, Cleve 

 Bidrag p. 494, n. 6. — Priore rainus, semilunare, magis incur- 

 vum, ventre inflato, ad utrumque polum largius attenuatum, api- 



