752 Conjugatae, Zygnemacere, Spirogyra. ^ 



latis, remotls, subtiliter dentatis, pyrenoides magaos nuraerosos 

 foventibus; anfractibus 1-2; zygotis ovato-ellipticis, maturitate j 

 brunneis, 102-108 a. latis, diametro fere sesquilongioribus. I 



Hab. in fossis, ad rivulorum, fluminum ripas, e. gr. in Saxonia \ 

 ad «Heinsberg» ad «Dresdam» ad «Aue, Zittau» (L. Rabenhorst), ; 



uLeipzig» (Bulnheim), in Thuringia ad uNordliausen)) (Kuetzing), ' 



in Moravia ad « Briinn, Zwittau » (J. Nave), in Austria ad « Berndorf, 

 Wiener Neustadt, Kirchdorf» (A. Grunow, Schliedermayr), iu :' 

 Hungaria ad ((Neusohl» (Al. Markus) et (cTheiss)) (Haszlinsky), ■ 

 in Borussia ad (( Berlin )) (Bauer), ad a Neudamm )) (Itzigsohn et | 

 Rotiie), ((Danzig)) (Klinsmann), in Franconia (P. Reinsch), in J 

 Neerlandia ad «Bockhorst^ (Spree), Belgio ad «Nieuport» (We- ^ 

 stendorp, De-Wildeman), in Galiia (Petit), Britannia (Cooke), ■ 

 Lusitania (Hbnriques), Amorica boreali (Wolle). | 



16. Spirogyra elegans Bonh. Sur quelques algues d'eau douce p. 6, 1791] 

 tab. I, f. 4 non Wollnj. — • Cellulis vegetativis 40 fx. latis, diame- 



tro 2-6-plo longioribus, utroque fine haud replicatis; chloropho- 'i 

 ris ternis, latiusculis; cellulis fructiferis utrinque iaflatis, doliolifor- ! 



mibus, diametro subduplo longioribus; zygotis ovatis. i 



Hab. iu aquis ad «Millau» in Gallia (Bonhomme). — Conjuga- j 

 tio scaliformis. j 



17. Spirogyra rivularis Rabenh. Fl. Eur. Algar. III, p. 243, Hansg. 1792 j 

 Prodr. p. 161 (an WoIIe Freshw. Alg. U. S. p. 220, t. 136, f. 4,7?), ' 

 non Zijgnema rioulare Hassall in Aunals of Nat. Hist. X, p. 38, ;| 

 Fresh. Alg. p. 144, n. 10, t. XVII, f. 1 et 2 nec Spirogyra ri- \ 

 vularis Kuetz. Tab. Phyc. V, t. 25. — Saturate viridis, lubrica, 

 siccata nitens; cellulis vegetativis perfecte cylindricis, 36-38 [/.. .\ 

 latis, diametro 4-11-plo longioribus, fertilibus vix tumidis, meni- 

 brana tenuissima, homogenea; chlorophoris spiralibus, 2-3, decus- 

 satis, latis, nodulosis, anfractibus ^Vo-^Y^J zygotis ovato-ellipticis. 



Hab. in rivulis, ad fluminum ripas, in Germania ad « Luckau 

 et Hoyerswerda» (Rabenhorst et Preuss), in Austria ad «Lie- 

 sing» (A. Grunow), Hungaria ad «Ofner Bader» (A. Grunow), 

 ad «Wallendorf» (C. Kalchbrenner), in Bohemia passim (Hans- 

 girg); in America boreali? (Wolle). — Var. minor Hansg. Prodr. 

 p. 161: cellulis vegetativis 24-30 a. latis, diametro 3-pIo longio- 

 ribus; chlorophoris 3; ceterum ut in typo. lu Bohemia passim 

 (Hansgirg). 



18. Spirogyra setiformis (Roth) Kuetz. Spec. pag. 442, Rabenh. Fl. 1793 

 Eur. Algar. III, p. 216, Cooke Brit. Freshw. Alg. pag. 87, t. 34, 



