7i6 Conjugatae, Zygnemaceae, Spirogyfa. 



strali (Wille). — Sec. cl. Petit varietates nodosa, forulosa et uio- 

 trichoides ad Spirogyram varianiem (Hass.) Kuetz. (quam confer.) 

 essent ducendae. — Var. lapponica Lagerh. Zur Algenfl. der Wasserf. 

 voD Lulea Eif in Botan. CentralbL 1884, II, p. 279: cellulis vege- 

 tativis angustioribus longioribusque ; chlorophoro singulo parurn 

 spiraliter contorto; cellulis fructiferis valde inflatis, 50 u.. et ultra 

 latis, plerumque abbreviatis; zjgotis late ovoideis, membrana tri- 

 plici, media castaneo-brunnea levique instructis. In cataracta ad 

 «Lulea Elf» Lapponiae (Lagerheim). — A tjpo diff^ert etiara pne- 

 sentia rudicularum per quas individua substratui adhaarent. 



4. Spirogyra varians (Hass.) Kuetz. Species p. 439, Kirchn. Alg. Schles. ^^19 

 p. 121, Petit Spirog. p. 19 p. p., Wolle Freshw. Alg. U. S. p. 212, 



t. 134, f. 8-13, Hansg. Prodr. p. 160, Zygnema varians Hass. 

 Brit. Freshw. Alg. p. 145, n, 29, f. 1-4, Rhynchonema abbrevia- 

 ium (Hass.) Kuetz. Species p. 414, Tab. Phyc. V, t. 34, Westend. 

 Herb. n. 159, Zygnema abbreviatum Hass. Brit. Freshw. Alg. 

 t. 34, f. 4, Rhynchonema Woodsii (Hass.) Kuetz. Species p. 444 

 Zygnema Woodsii Hass. 1. c. t. 33, f. 2. — Csespitibus densis, sor- 

 dide viridibus, denique fuscescentibus; cellulis vegetativis 33-47 

 p. latis, diametro 1-3-plo longioribus ; chlorophori singuli anfra- 

 ctibus 11/2-3; cellulis fructiferis unilateraliter, ceteris utroque la- 

 tere sequaliter tumidis; conjugatione saepe laterali ; zygotis ellipti- 

 cis vel ovoideis, 33-38 pt.. latis, diametro 1 y^-SV^"?^^ longioribus. 

 Hab. in fossis et stagnis in Gerraania (Rabenhorst, Kuetzing, 

 Kirchner), Bohemia (Karl, Hansgirg), Belgio (Westendorp, De- 

 Wildeman), Rossia (Artari), Anglia (Hassall, Jenner, Martin, 

 Carrington), Gallia (Brebisson), America boreaii (Wolle); ad 

 «Montevideo» in America australi (Wille). — Species valde poly- 

 morpha. 



5. Spirogyra fusco-atra Rabenh. in Alg. Mitteleurop, n. 98, Fl. Eur. ngo 

 Algar. III, p. 240, Kirchn. Alg. Schles. p. 124, Wolie Freshw. Alg. 



U. S. p. 215, t. 140, f. 4-7. — Dense caespitosa, minus lubrica, 

 sordide viridis, fructus terapore nigrescens, exsiccata fusco-purpu- 

 rascens vel fusco-atra; cellulis vegetativis cjlindricis vel modice 

 tumidis, geniculis plus minnsve constrictis, 40-55 a. latis, diametro 

 2-4-plo longioribus; chlorophoris singulis, laxis, anfractibus 2-2 '/2 5 

 zjgotis polymorphis, globosis, eliipticis, oblongis cylindricisve, circ. 

 47 p.. latis, diametro sequalibus, duplo-quadruplo longioribus, matu- \ 



ritate aureo-fuscescentibus, lucidis, cellulis collapsis, saepe monili- | 



formi-concatenatis. 



