Conjugatse, Zygaemaceae, Spirogyra. '«37 



, t. 132, f. 4-5. — Flavo-virescens, valde lubrica; celiulis vegeta- 

 tivis hyalinulis, 18-21 ^a. latis, diametro 10-15 (-'25?)-plo longio- 

 ribus; clilorophoro gracili, laxo, anfractibus IV^-I; cellulis fructi- 

 feris inflati, 30-42 jj.. latis, haud abbreviatis; zygotis brevi-elli- 

 pticis, ad 36 a. latis, diatuetro 2-3 -plo longioribus, raaturitate fla- 

 vesceutibus. 



Hab. in aquis stagnantibus ad «Bokhorst» Neerlandiae (Th. 

 Spree), ad «Bondy et Mitry» Galliae (P. Petit), in stagnis moa- 

 tanis Pennsylvania; in Araerica boreali (Wolle). 



52. Spirogyra olivascens Rabenh. Alg. n. 185!, Krypt. Flor. von Sachs. 1827 

 p. 207, Fl. Eur. Algar. III, p. 235. — Saturate viridis, valde lu- 

 brica, siccando o\\\a.iicens, Spiroffyram maximam revocans; cellulis 

 vegetativis 30-35 jj.. latis, diametro 4-6-10-plo longioribus, fructiferis 

 plus minus tumidis, ad tertiara partera abbreviatis; chlorophori an- 

 fractibus arctis 3-3'/2-4; zygotis late ellipticis, denique fusco-oli- 

 vaceis. 



Hab. in fontibus prope ((Schandau» Saxoniae (Rabenhorst), 

 prope ((Neudamni)) Borussi^e (H. Itzigsohn); prope «Donaueschin- 

 gen » (G. Zeller). 



53. Spirogyra quadrata (Hassall) Petit in Bull. Soc. Botan. Fr. t. 21, 1828 

 p. 41, t. 1, ,f. 2, Spirog. p. 8, t. I, fig. 13, Kirchn. Krypt. Fl. 

 Schles., p. 119, Cooke Brit. Freshw. Alg. pag. 95, t. 39, f. 1, 

 Gay Monogr. Conjug. pag. 89, De-Toni e Levi Fl. Alg. Ven. III, 



p. 64, Hansg. Prodr. p. 165, n. 281, Wolle Freshw. Alg. U. S. 

 p. 208, t. 132, f. 8-10, Spirogyra pulchella Wood Freshw Alg. 

 U. S. p. 164. t. 14, f. 2 sec. Wolle, Rhynchonema pulchellum 

 Wood in Proc. Araer. Philos. Soc. 1869, p. 138, Zygnema qua- 

 dratum Hassall Brit. Freshw. Alg. p. 157, t. 37. f. 1-2, Rhyn- 

 chonema quadratum Kuetz. Species p. 443, Tab. Phyc. V, t. 32, 

 f. 6, Rabenh. Fl. Eur. Algar. III, p. 230. — Filaraentis plerumque 

 inter alias algas sparsis, rarius iu flocculos virides, raucosos conge- 

 stis; cellulis vegetativis 21-27 (rarius ad 33) [x. latis, diaraetro 

 3-9-plo longioribus; chlorophoro singulo, lato, anfractibus V/.2-b 

 (-6); cellulis fructiferis valde raedio inflatis (non ventricosis sed 

 quasi quadraticis), 48-54 ■i. latis; zygotis ellipticis vel subfusifor- 

 mi-cylindricis, 40-48 a. latis, diametro IV^-^-plo longioribus, ma- 

 turitate brunneis; conjugatione saepius laterali. 



Hab. in fossis Gerraaniai, plerumque singulatim inter varias 

 Algas filaraentosas (L. Rabenhorst, Kirchner. Kuetzing), prope 

 «Bokhorst» in Neerlanlia (Tn. Spree) ad « High Beech, Eppiug 



