Conjugatae, Desmidiacece, Gonatozygon. 801 



apicibus rotiindatis, emarginatis; semicellulis ut plurimum contor- 

 tis, circumscriptionem irregulafem prsebentibus; membrana levi ; 

 diam. 37-40 ^.. 



Hab. in stagno cc Brown' s Mills » New-Jersej Amoric;o borealis 

 (Wolle). — Var. novizelandicum Nordst. in Botaniska Notiser 1887, 

 p. 155 et in Notarisia 1888, p. 409, Nordst. Fresliw. Alg. N. Zeal. 

 and Austral. p. 24, t. II, f. 1-2: semicellulis a vertice visis latera 

 tantum levissime concava praibentibus; filamentis tortis. In catara- 

 cta ad (( Papakauri » in Nova Zelandia (S. Berggren) — Lat. cell. 

 34-3G a; long, 46-50 a.; lat. connect. inter cell. 17-20 a.; lat. 

 isthmi 20-28 [x. 



GONATOZYGON De-Bary [1856] Conjug. p. 77, (^]tym. gonu genicu- 1908 

 lus et zygon jugum), Rabenh. Fl. Eur. Algar. III, p. 155, Hansg. 

 Frodr. p. 167, Cooke Brit. Desm. p. 2, Kirchner Alg. Scliles. p. 131, 

 Wolle Desm. U. S. p. 22, Leptocyslinema Arch. [1859] in Micr. 

 Journ., Bocidii sp. Brcib. et Ralfs. - CellukB elongato-cylindricae 

 vel truncato-fusiformes, nec constrictae nec incisae, in filamenta prse- 

 longa fragilia conjunctaj, conjugationis tempore genuflexaj; chloro- 

 phora axilia, undulata tortaque. 



Multiplicatio cellularum divisione vegetativa; generatio zygotis 

 globosis conjugatione genuflexa ortis. 



1. Gonatozygon asperum (l^^reb.) Cleve Sver. Desm. p. 496 (1864), 

 Nordst. xNorg. Desm. p. 50 (1873), Hansg. Prodr. n. 288, Gonaloztjgon 

 Brebissonii De-Bary Conjug. p. 77, t. 4, f. 26-27, Rabenh. FI. 

 Eur. Algar. III, p. 156, Cooke Brit. Desm. p. 2, t. 1, f. 2, Boci- 

 dium asperum Breb. List. p. 147, t. 2, f. 33 non Ralfs, Lepto- 

 cystinema Portii Archer m Micr. Journ. 1859 p. 134. — Cellulis ve- 

 getativis fusoideis, utrinfjue subtruncatis, laxe connexis, saepe sin- 

 gulis, 97-140 s 5-8; membrana granulato-asperula. 



Ilab. in stagnis, fossis etc. Saxonise (Rabenhorst, Riciiter), 

 ad Friburgum i. Br. Germaniie (De-Bary), pr. ((Falaise» Galliae 

 (Brebisson) ad Dublinum in Hibernia (Archer) ad Upsaliam (Cle- 

 ve) aliisque Sueciae locis (Lundell), pr. (( Przibram » Bohemiae 

 (Hansgirg), in Norvegia (Nordstedt) et Spitzbergia (Nordstedt); 

 in Belgio (De-Wildeman); in Birmania Asiae (Joshua). 



2. Gonatozygon Ralfsii De-Bary Conjug. p. 76, t. 4, f. 23-S5, Archer i909 

 in Pritch. Inf. p. 721, Hansg Prodr. p. 276, Cooke B. D. p. 2, 



t. 1, f. J, Gonatozygon asperum (Ralfs) Rabenh. Kr. FI. Sachs. 



5L 



