764 Conjugatse, JJygnemacefe, Sptrogyra. M 



rophoris sublatis, dense granulatis, anfractibus subconfertis, 2-3; 

 zygotis ovoideis, diametro paulo longioribus. 



I¥ab. in aquis salsis et submarinis, in fossis ad ((Malmon Sue- 

 ciae (L. Rabenhorst), in lacu salso ad Halam (Bulnheim), in Neer- 

 landia et Lusitania (Henriques), in Florida Araericse bor, (Wolle); 

 ad Tergeste atque in aqua dulci prope (( Nordhausen)) (Kuetzing). 



45. Spirogyra dubia Kuetz. Tab. Phyc. V, t. 24, Bad. n. 353, Rabenh. 1820 

 FI. Eur. Algar. HI, p. 2-13, Kirchn. Alg. Schles p. 122 (f. genuina), 

 Hansg. Prodr, p. 162 (id.), Wolle Freshw. Alg. U, S. p. 220, t. 135, 

 f. 11-12. — Saturate viridis, valde lubrica; cellulis vegetativis 

 cylindraceis, 40-50 a. latis, diametro sesqui- ad triplol ongioribus; 

 chlorophoris 2, sublatis, anfractibus laxis, 2-3 (rarius ultra); cel- 

 lulis fructiferis modice tumidis, geniculis leviter constrictis; zygo- 

 tis late ellipticis, maturitate fuscescentibus, opacis, diametro lYo" 

 lYg-plo longioribus, 



Hab. in pluribus locis Germaniae, Belgii (Do-Wildeman) Austrife, 

 Rossi» (Artari), Hungarise passim Bohemiae (Hansgirg), Ame- 

 ricse borealis (Wolle). — Var. longiartlculata Kuetz. Tab. Phyc. 

 V, p. 8, t. 25, f. 1, Rabenh. Fl. Eur. Algar. III, p. 243, Kirchn. 

 Alg. Schles. p. 122, Hansg. Prodr. p, 162, Wolle Freshw. Alg. 

 U. S. p. 220: cellulis vegetativis diametro ad 5-pIo longioribus; 

 chlorophoris 2-3. Cum species passim. 



46. Spirogyra ovigera Mont. Cryptog. guyanens. Algoe n. 48 in Ann. 182I 

 Scienc. Nat, 1850, p. 305, Syll. p. 463, 'n. 1644, Rabenh. FI. Eur, 

 Algar. III, p. 247. — Filis flexuosis, obscure viridibus, suboli- 

 vaceis, absque nitore; cellulis vegetativis 40 a. latis, diametro sesqui- 

 septuplo longioribus; chlorophoris ternis, densis; zygotis ovoideo- 

 ellipsoideis, magnis, 100 s; 60 u.. intus granulosis, tandem brunneis. 



Hab. in rivulis ad Cayennam Americae australis (LeprieuR); 

 in insula Guadelupa (Maze). 



Subsectio II. Monozyga Hansg. in Hedwigia 1888, Heft 9-10: Tubus connexi- 

 vus tantum ex una cellularuni conjugatarum egrediens. 



47. Splrogyra conspicua Gay Essai Monogr. Conjug, p. 91, t. IV, 1822 

 f. 5-6. — Caispites saturate virides efiformans; cellulis vegetativis 



45 u.. latis, diametro 1-3-pIo longioribus, utroque fine haud repli- 

 catis; chlorophoris 5, latis, margine denticulatis, medio subcostatis, 

 - anfractibus V^-lVo; cellulis fructiferis (fcEinineis) inflatis, doliolifor- 

 mibus, tubum conjugationis haud emittentibus ; zygotis oblongis, 

 apice rotundatis, 55 u. latis, diametro sesquilongioribus, brunneis. 



