Conjugatpe, ZygQeraaceiTe, Spirogyra. 749 



ff Zygotorum membrana niedia pnnctata vel cymatiis canaliformibus in- 

 structa. 



10. Spirogyra velata NorJst. in Lunei. Univ. Arsskr. 1879, vol. IX, in nss 

 Rabonh. Algen Eur. n. 2272, Aresch. Alg. scand, exs. n. 358, 

 Hedwigia 1872, p. 78, Cooke Brit. Freshw. Alg. p. 297, t. 130, 



f. 1, Petit Spirog. Paris p. 24, t. VII, f. 1-5. — Sparsa ; cellulis 

 vegetativis apicibus truncatis, 29-37 a. (raro ad 54 [j..) latis, dia- 

 metro duplo-quadruplo longioribus; chlorophoro t?eniaeformi, sia- 

 gulo, anfractibus 1 ^/^-Q; cellulis fructiferis parum turgidis, non per- 

 sistentibus; zygotis late ovoideis, 60-90=^35-48, maturitate fla- 

 vescentibus, mesosporio duplicato strato interno levi castaneoque, 

 externo hyalino, scrobiculato, punctato. 



Hab. in fossis argillaceis ad a Stehay » Scaniae (0. Nordstedt) 

 ad {( Leicester » Angli;x} (b\ Bates) et ad aMitry» Gailise (Petit); 

 ad a Oudoui » prope a Natotschiyi » in Rossia (Riabinine). — Specimi- 

 na gallica ad 54 a. lata; zygota in speciminibus rossicis [ex Riabi- 

 nine Chloroph. de Kharkow p. 47, n. 183] lOS-120 ^ 57-48, el- 

 lipsoidea. 



11. Splrogyra daedalea Lagerh. Sopra alc. Alghe nuove o rimarch. in ^''^^ 

 Notarisia III, 1888, p. 592. — Cellulis vegetativis cylindricis, utroque 

 fine non replicatis, 180-330^:33-36; chlorophoro singulo, anfra- 

 ctibus laxis, 2-3,5; zygotis ellipsoideis, membranis ternis praeditis; 

 membrana externa tenui, hyalina, media crassa, fusca, cymatiis 

 canaliformibus, flexuosis instructa, interna tenui, hyalina ; cellulis 

 fructiferis non vel paullum inflatis, cellulis vegetativis brevioribus 

 75-120::; 36-45. 



Hab. in piscina ad oppidum a Alt-Breisach » Germauite (G. 

 Lagerheim). — Spirogyra^ longatcB affinis. 



"* Chlorophora in unaquaque cellula duo vel plura. 

 f Zygota ovoidea vel ellipsoidea. 



12 Splrogyra decimina (Muoll.) Kuetz. Phyc. germ. p. 223 ampl., Spe- 1787 

 cies p. 440, Tab. Phyc. V, t. 23, f. 3 e 24, f. 1, Rabenh. Fl. Eur. 

 Algar. III, p. 242, Kirchn. Krypt. Fl. Schles. p. 1 18, (f. ^enwma), 

 Gay Monogr. Conjug. p. 86, Petit Spirog. p. 25. t. 8, fig. 1-3, 

 De-Toni e Levi Fl. Alg. Ven. III, p. 65, Hansg. Prodr. p. 161, 

 Wolle Freshw. Alg. U. S. p. 216, t. 135, f. 5-6, Desmaz. Cr. Fr. 

 ed. I, n. 454, Spirogyra portioalis var. decimina Cooke Brit. 



