"^^S Conjugatse, Zygnemace£B, Spirogyra. 



Heft 9-10, p. 255, De Vries Ueber die Coiitraction der Chlorophyll- 

 bander bei Spirogyra in Ber. deutsch. bot. Gesellsch. 1889 I, 

 p. 19-27, t. II, Rhynchonema Kuetz. [1849] Species p. 443, Ra- 

 benh. FI. Eur. Algar. III, p. 229, *S?Vo^onmm Kuetz. [1843] Phyc. 

 gener. p. 278 ex parte, Rabenh. Fl. Eur. Algar. III, p. 256, Zy- 

 gnemaiis, Mougeotice, Confervce sp. auct. veter., Conjugala Vauch. 

 [1803] Conferv. p. 37 ex parte, nec Conjugata Link [1820] in 

 Nees Hor. phjs. berol. p. 5, Salmacis Bory [1827] Dict. class. 

 XV, p. 75, nec Webb. et Berth. — Cellulae thalli filiformi cylin- 

 draceae; chlorophora siugula vel plura, parietalia, recta vel spira- 

 liter decurrentia ; nucleus siugulus. 



Generatio zygotis; conjugatio aut inter duo filaraenta approxima- 

 ta scaliformis (cellulis conjugatis tubo conjugationis conjunctis) aut 

 lateralis inter duas cellulas imniediate contiguas ejusdem filamenti 

 aut genuflexa; zygota semper intra uuam (faemineam) cellularum 

 conjugatarum efformata, mesosporio levi vel punctulato, ut pluri- 

 murn brunneo praedita, globosa, ovata, elliptica vel lentiformia. 

 Cellulae fructiferaj tum vegetativis conforraes (cylindraceae) tum plus 

 minus tumidae (dolioliformos). 



Obs. Cajspites libere natantes, saepissirae longe lateque expansi, 

 pleruraque valde lubrici, moUes, lacte vel saturate virides, nonnun- 

 quam luteo-virides, siccati colore aut vix aut noa mutati, chartae 

 arcte adhaerentes. 



Subgen. I. Euspirogyra (Link) Hansg. Prodr. p. 157 et in Hedwigia 1888, 

 Heft 9-10, Spirogyra Link in Rabenli. Fl. Eur. Algar. III, p. 233 inel. 

 Rhynchonema Kuetz. in Rabenh. Fl. Eur . Algar. III, p. 299. 



Chlorophora taeniaeformia spiraliter contorta, raro axi filamenti longitudi- 

 nali subparalleliter decurrentia. Conjugatio scaliformis vel lateralis (haud raro 

 utraque in iisdem fllamentis). Cellulae conjugat» pleruraque aequimagnae, raro 

 una (fojminea) alteram raagnitudine (h. e. longitudine) superat. Tubus conne- 

 xivus plerumque distincte evolutus. 



Seclio i. Conjugata (Vauch.) Hansg. Prodr. p. 157 et in Hedwigia 1888, Heft 

 9-10. — Dissepimenta cellularura utroque fine hBvia, rarissirae protensa 

 vel replicatajchlorophora spiralia vel subrecta, singula vel 2-7; membrana 

 media zygotorum levi vel punctata vel scrobiculata. 



Subsectio L Diplozyga Hansg. in Hedwigia 1888 Heft 9-10. — Cellul» con- 

 jugatae una alteraque tubum conjunctivum emittentes. 



A. Cellulae fructifene non vel indistincte inturaescentes. 



