838 Conjugatae, Desmidiacese, Tetmemorus. 



Hassall, Cooke), Gallia (De-Brebisson, Petit, Gay), Belgio (De- 

 Wildeman), Germania (Rabenhorst, Kirchner), Bohemia (Hans- 

 GiRG), Fennia (Klfving), Suecia (Cleve, Lundell, Wittrock), 

 Dania (Jacobsen), Norvegia et ad «Bornliolm» (Nordstedt), Lap- 

 ponia rossica (Nordstedt), Italia (De-Notaris, Delponte, De- 

 ToNl, Levi), Hjnngaria (Istvanffi), America boreali (WooD, WoL- 

 le), ad « Mauna Kea » ins. Sandwic. (S. Berggren sec. Nord- 

 stedt). 



3. Tetmemorus levis (Kuetz.) Ralfs Brit. Desm. p. 146, f. 24, f. 3 c, 2093 

 Arclier in Pritch. Inf. p. 7-16, Rabenh. Alg. n. 1655! Fl, Eur. Al- 

 gar. III, p. 140, Kirchn. Alg. Schles. p. 145, Cooke Brit. Desm. 



p. 49, t. 19, f. 2, Wolle Desm. U. S. p. 91, t. 50, f. 35, t. 20, 

 f. 3, Haasg. Prodr. p. 188, Nordst. Freshw. Alg. of N. Zeal. and 

 Austral. p. 67, t. III, f. 19, Penium leve (Ralfs) Gay Essai p. 71, 

 Tetmemoriis granuiahis var. minus Jacobs. Apergu p. 180, t. 7, 

 f. 10, Penium fTeimemorus) Brebissonii Kuetz. Species p. 167, 

 excl. synon., Closterium leue Kuetz. Phyc. germ. p. 132. — Cel- 

 lulis 67-70:^20-25,6 fronte visis subangustatis, apicibus truncatis, 

 e latere fusiforraibus ; raembrana levissima; zygotis primo quadra- 

 ticis, dein ovatis, compressis. 



Hab. in stagnis fossisque in Britannia (Ralfs, Cooke), Gallia 

 (Gay, DE-BREBissoN),Belgio (DE-WiLDEMAN),Germania (Kuetzing, 

 KiRCHNER, Rabenhorst), Austria (Grunow), Bohemia (Hansgirg), 

 Italia (De-Notaris), Norvegia et ad «Bornholm» (Nordstedt), 

 Lapponia rossica (Nordstedt), Nova Semlia (Wille), Dania (Ja- 

 cobsen), Fennia (Elfving), America boreali (Wood, Wolle), ad 

 «Hokianga et Omatangi» in Nova Zelandia (S. Berggren). — Spe- 

 ciraina novozelaudica praebent, sec. Nordstedt 1. c, cellulas 92-128 := 

 22-32 (23-27 a. cr.). — Var. attenuatus Wille Ferskvandsalger 

 fra Novaja Semlja p. 58, t. XIV, f. 77: cellulis 91^30, medio 

 leviter constrictis; semicellulis a fronte visis a medio ad apicem la- 

 teribus sensim attenuatis, convexis, a latere visis prope apicem le- 

 viter concavis; isthmo 27 u.. lato ; membrana subtilissime punctu- 

 lata. Ad « Mollerbay, Matotchkin )) Novob Semliffi (Wille). — Var. 

 COntinUUS Nordst. De Algis et Characeis Sandwicensibus p. 10: 

 celluUs medio non (vel quam levissime, vix visibiliter) constrictis, 

 56-58 i; 18-20; membrana ut in typo subtilissime irregulariter gra- 

 nulato-punctulata. In monteuMauna Kea » ins. Sandwicensium ra- 

 rius (S. Berggren). 



4. Tetmemorus minutus De-Bary Conjug, p. 74, t. V, f. 10, Archer 2094! 



