Conjugatse, Zygnemacete, Spirogyra. ^45 



* Chlorophorii in unaquaque cellula singula. 

 •\- Zygotorum membranae omnes leves. 



1. Spirogyra longata (Vauch.) Kuetz. Species p. 439, Tab. Phyc, V, 1776 

 t. 20, f. 1, Rabenh. Fl. Eur. Algar. III, p. 238, Cooke Brit. Freshw. Alg. 



p. 92, t. 36, f. 2, Kirchn. Krypt. Fl. Schles. p. 123 (f. genuina), 

 Gay, Monogr. Conjug. p. 86, Petit Spirog. Paris p. 20, t. V, f. 4-5, 

 De-Toni e Levi Fl. Alg. Ven. III, p. 63, Wolle Freshw. Alg. U. S. 

 p. 214, t. 135, f. 9-10, Hansg. Prodr. p. 159 (f. genuina), Conju- 

 gata longaia Vauch. Hist. Conf. p. 71, t. 6, f. 1, Zygnema lon- 

 gatum Ag. Syst. p. 80, Zygnema cBstivum Hassall Brit. Freshw. 

 Alg. p. 146, t. 28, f. 3-4. — Cellulis vegetativis 24-36 fx. latis, 

 diametro 3-10-pIo longioribus; chlorophoro singulo, lato, anfracti- 

 bus 2-5; cellulis fructiferis haud inflatis; zygotis late ovatis, api- 

 cibus rotundatis, niaturitate pallide-flavis, 18-28 ^. latis, diametro 

 lYg-^Vo-plo longioribus. 



Hab. in fossis, ad lacuum rlpas, in stagnis per totam Europam 

 passim imprimis in Gallia (Petit, Gay), Germania (Rabeniiorst, 

 Kirchner), Bohemia (Hansgirg), Britannia (Hassall, Cooke), Bel- 

 gio (De-Wildeman), Rossia (Artari, Riabinine), in America bo- 

 reali (Wolle), in Republica Argentina Amer. austr. (Nordstedt). 

 — Var. elongata Rabenh. FI, Eur. Algar. III, p. 238, Hansg. 

 Prodr. p. 159, Kirchn. Alg. Schles. p. 123, Spirogyra longaia 

 Cram. et Br. in Rabenh. Alg. n. 1480: cellulis vegetativis 22-24 

 p. latis, diametro 4-12-pIo longioribus; cellulis fructiferis diametro 

 vix duplo longioribus, In Helvetia (?Cramer), — Var, reversa 

 (Hassall) Kirchn, Alg, Sciiles. p. 123, Hansg, Prodr. p, 159, Rhyn- 

 chonema reversum (Hassall) Kuetz. Species p.444, Hilse in Rabenh. 

 Alg. n. 1707, FI. Eur. Algar. III, p. 232, Zygnema 7'eversum 

 Hassall Brit. Freshw. Alg. t. 33, f. 3: cellulis vegetativis 24-32 

 p.. latis, diametro 2-pIo longioribus; chlorophororum anfractibus 

 plerumque 2 ^fo; conjugatione laterali; zygotis ellipticis, circ. 28 a. 

 latis, diaraetro 2-2 Yg-plo longioribus. In fossis Angline (Hassall); 

 prope Vratislaviam Silesiae (Hilse). 



2. Spirogyra porticalis (Muell.) Cleve Svensk., p. 22, t. V, Gay Mo- ^77 

 nogr. Conjug. p. 88, Petit Spirog. p. 21, t, V, f. 8-12, De-Toni 



e Levi FI, Alg, Ven, III, p, 62, Hansg, Prodr. p. 1.59 {(. genuina), 

 Wittr. et Nordst. Alg. aq. dulc. exsicc. n. 363, Conferva poriicalis 

 Muell. Nov. Act. Petrop. 1785, p. 90, Conjuyafa porticali^ Vauch. 



