758 Conjugatse, ZygQemaces, Spirogyra; 



U. S. p. 219, t. 140, f. 1-3, Cooke Brit. Freshw. Alg. p. 85, t. 32, 

 fig. 1, Zygnema serraium Hassall Freshw. Alg. pag. 140, n. 4, 

 t. XXIII, f. 1 et 2. — Sordide viridis, denique luteo-fuscescens, se- 

 taB crassitie, siccando chartae minus adhaerens, rigida; cellulis ve- 

 getativis 120-150 pt. latis, diametro aequalibus (nonnumquam aliis 

 duplo longioribus); membrana tenui, homogenea, geniculis levissi- 

 rae constrictis; chlorophoris 4 vel ultra, sublatis, inciso-profunde 

 dentatis vel tuberculatis, irregulariter remotis, nonnunquara sub- 

 verticalibus; anfractibus Vs-l ; zygotis late ovatis, compresso-ap- 

 planatis, maturitate brunneis, 144-150 a. jatis, diaraetro 1-1 V2 ^on- 

 gioribus. 



Hab. in fossis et fodinis per totam Europam passim, imprimis 

 in Germania, Austria, Helvetia, Italia, Rossia, Gallia, Britannia, 

 Lusitania, Bolgio; etiam in Araerica boreali; ad «Montevideo» in 

 America australi (Arechavaleta sec. Wille); in ius. «Madera» 

 (Grunow). — Var. Heeriana (i\aeg.) Rabenh. Fl. Eur. Algar. III, 

 p. 246, Kirchn, loc. cit., Petit loc. cit., Haiisg. loc. cit., Spirogy- 

 ra Heeriana Naeg. in Kuetz. Spec. p. 442, Tab. Phyc. V, t. 28, 

 f. 3: cellulis omnibus diametro iVg-^-pIo longioribus; ceterum ut 

 in typo. Cura specie passira. 



B. Cellulse fructiferae distincte inflatse. 

 * Chlorophora in unaquaque cellula singula. 



31. Spirogyra affinis (Hassall) Petit in BuU. Soc. Bot. Fr. XXI, 

 p. 42, Spirog. Paris p. 18, t. III, f. 12-13, Kirchn. Alg. Schles. 

 p. 117, Hansg. Prodr. p. 158, Gay Essai Monogr. Conjug. p. 89, 

 Zygnema affine Hassall Brit. Freshw. Alg. p. 155, t. 34, f. 6, 

 Rhynchonema affine Kuetz. Spec. p. 444, Tab. Phyc. V, t. 33, 

 f. 2, Rabenh. Krypt. Fl. Sachs. I, p. 205, FI. Eur. Algar. III, 

 pag. 231. — Cellulis vegetativis 25-30 p. latis, diametro 1^2-3- 

 plo lougioribus; chlorophoro gracillirao, anfractibus 1-3^2, saepius 

 tantura annuliforrai-convoluto; cellulis fructiferis valde inflatis, 

 vesiculosis, subsphaericis, non abbreviatis; zygotis globoso-ellipticis, 

 28-33 fx. latis, diaraetro l-lV^-plo longioribus; conjugatione S3e- 

 pius laterali. 



Hai. inter algas varias in stagnis Bohemiae (Hansgirg), Ger- 

 maniee (Rabenhorst, Kirciiner), Galliae (Gay, Petit), Britanniae 

 (Hassall), Helvetia3 (Kuetzing), Italia? (De-Toni), Hispanise (D"* M. 

 Lewin), Araericae borealis (Wolle). — Teste Kirchner I. c. huc 



1806 



