CoDjugatae, Desmidiacese, Cosmariura. 941 



vertice explanato; clilorophoris in utraque sernicellula singulis ; 

 membraua distincte punctulata. 



Hab. in Helvetia (Naegeli), ad «Norby skog, Bergsbrunna, 

 Oottsutida, Noor» Uplaadiae et ad «Unnaryd, Rappe» Smolandise in 

 Suecia (Cleve, Lundell), prope «Celakowic, Lomnic etPlana» in 

 Bohemia (Hansgirg); ad lacum «Spring» New Jersey in America 

 boreali (Wolle); in Birmania (JosHUA). — A Cosmario Phaseolo 

 Breb., teste Lundell 1. c, differt semicellulis plerumque ellipticis 

 nec reniformibus, tumore centrali nuUo, membrana subtilissime 

 punctata et latitudine corporis praj longitudinem majore; Arlhro- 

 desmo convergenti Ehreub. autem sine dubio maxime affine est. 

 22. Cosmarium crenatum tlalfs in Transact. of the Bot. Soc. of Edinb. 2259 

 H, 1, p. 150, t. XVI, f. 6, Brit. Uesmid. p. 96, t. XV, f. 7, Breb. 

 Liste p. 127, Rabenh. Krypt. Flor. v. Sachs. p. 199, Alg. 1211!, 

 De-Not. Element. p. 47, t. IV, f. 34, Rabenh. Fl. Eur. Algar. III, 

 p. 165, Kirchn. Alg. Schles. p. 149, Cooke Brit. Desm. p. 95, t. 37, 

 f. 13, WoUe Desm. U. S. pag. 67, t. 49, f. 31-32, Hansg. Prodr. 

 n. 390, Delp. Desm. subaip. p. 102, Euasirum? sinuosum Kuetz. 

 Spec. Alg. p. 174. — Minutura, oblongum, tertiam parteni circa 

 longius quam latum, profunde constrictum, sinu lineari angusto ; 

 semicellulis e basi lata subsemicircularibus, dorso plus minus de- 

 pressis vel truncatis, ambitu crenatis vel regulariter undulato-cre- 

 natis, crenis 10-14; membrana punctata; pyrenoidibus singuiis;e 

 vertice visum ellipticum ; zygotis globosis, spinis brevibus validis- 

 que, basi tumidis apiceque 2-3-fidis obsitis. 



Ilab. in stagnis, rivulis lente fluentibus imprirais pluribus locis 

 Angliae (Ralfs, Cooke), Galliae (Brebisson, Petit), Germaniae (Ra- 

 BENHORST, Kirchner), Suecise (Lundell), Norvegiae (Nordstedt, 

 WiLLE), Spitzbergise (Norstedt), Novee Semlise (Wille), Groenlan- 

 diae (Nordstedt), Austriaj (Grunow), Bohemire (Schroeter, Hans- 

 girg), Hungari?e (Schaarschmidt), Italise (Delponte, De-Notaris, 

 Nordstedt), Danise (Jacobsen), Amer. bor. (Wolle, Wood), Reipu- 

 blicae Argentinae (Nordstedt), Sibiriae (Boldt), Japoni;B (RoY, Bis- 

 set), Birmania} (Josiiua), ad « Oahu » ins. Sandwicensium (S. Berg- 

 gren sec. Nordstedt). — Var. subcrenatum Rabenh. FL Eur. Algar. 

 III, p. 165, Euastrum ocnaiwn Perty Kl. Lebeusf. t. VI, f. 10: mi- 

 nus constrictum, ambitu vel vix vel levissime undulato-crenatum, 

 crenis 11. Cum specie passim. Dimens. 53-58^38 (Kirchner), 21 

 ^ 16 (Delponte). Diam. 30-38 u.. (Wolle). — Var. nanum Wittr. 

 in Wittr. et Nordst. Alg. aq. dulc. exs. n. 563 et in Botaniska 



