750 Conjugatte, Zygnemacese, Spirogyra. 



Freshw. Alg. p. 90, t. 35, f. 2, Spirogyra major Kuetz. Tab, 

 Phyc. V, f. 24, f. 2?, Rabenh. Fl. Eur. Algar. III, p. 248, Con- 

 ferva decirnina Muell. in Nov. Acta Petrop. 1785, III, t. 2, f. 3, 

 Zygnema deciminum Hassall Brit. Freshw. Alg. p. 144, t. 23, 

 f. 3. — Cffispites sordide virides, lubricos efforraans ; cellulis ve- 

 getativis 33-40 a. latis, diametro 2-4-plo longioribus; chloropho- 

 ris 2 (raro 1 vel 3), latis, decussatis, anfractibus l-2;cellulis fru- 

 ctiferis aut non aut modice inflatis; zygotis subglobosis, late ovatis 

 vel ellipticis, filamentis subaequilatis. 



Hab. in aquis stagnantibus, in fossis ad lacuum, rivulorum, flu- 

 minum ripas per totam Europara, imprimis in Italia (De-Toni, Le- 

 vi), Gallia (Gay, Desmazieres, Petit), Britanoia (Hassall, Cooke), i 



Germania (Rabenhorst, Kirchner), Belgio (Kickx,De-Wildeman) | 



Lusitania (Henriques), Hispania (D."^ Lewin), Boheraia (Hansgirg), j 



Austria (Grunov^^); in America boreali (Wolle); in Algeria (MoN- i 



tagne). — Var. flavicans (Kuetz.) Rabenh. FI. Eur. Algar. III, | 



p. 212, Petit Spirog. Paris p. 26, Kirchn. Alg. Schles. p. 118, j 



Hansg. Prodr. p. 161, Spirogyra flavicans Kuetz. 1. c. : filamentis 

 flavo- vel brunneolo-viridibus ; ceterum ut in typo. Cura specie hinc 

 inde; in lacu salso ad Halam. — Var. laxa Kuetz. 1. c, Rabenh. \ 



Fl. Eur. Algar. III, p. 242, Kirchn. Alg. Schles. p. 118, Hansg. 

 Prodr. p. 161 : chlurophoris irregulariter contortis; ceterum ut in 

 typo. Cura specie passim. 



13. Spirogyra negiecta (Hassall) Kuetz. Species p. 441, Rabenh. FI. i^^s ; 

 Eur. Algar. III, p. 248, Petit Spirog. Paris p. 26, t. IX, f. 1-5, j 

 Hansg. Prodr. p. 162, Wolle Freshw. Alg. U. S. p. 215, t. 136, \ 

 f. 8-9, Zygnerna neglecium Hassall Brit. Freshw. Alg. p. 142, i 

 t. 23, f. 1-2. — Cellulis vegetativis 54-65 p.. latis, diametro 2- \ 

 5-plo longioribus; chlorophoris 3, medio quasi nervo percursis, py- .j 

 renoides longitudinaliter uniberiatos paucos includentibus, anfracti- \ 

 bus l-^y^; cellulis fructiferis paullulum inflatis, diaraetro IVg-^- 



plo longioribus; zygotis plerumque ovatis, utrinque rotundatis, ma- | 



turitate olivaceo-flavescentibus, 54-60 (/. latis, diametro circiter 

 sesquilongioribus. 



Hab. in Britannia (Hassall), in Gallia (Petit), in Belgio (De- 

 Wildeman), prope Pragam in Bohemia (Hansgirg), in Carolina 

 inferiori America3 borealis (Wolle). 



14. Spirogyra nitida (Dillw.) Link Handb. III, p. 262, Kuetz. Species 1789 

 p. 442, Tab. Phyc. V, t. 27, Rabenh. FI. Eur. Algar. III, p. 245, 

 Cooke Brit. Freshw, Alg. p. 86, t. 33, f. 1, Kirchu Krypt. Flor. 



