181 

 b. I.olti polares eriilenter discrcti, in apice angusle incisi. 



E. oblongum (Grev. 18:50!) Ralfs (in Transact. of the Bot. Soc. 

 II. 1. p. 126. X. 2. T. X. F. 4. Brit. Desmid. p. 80. N. 2. T. XII. 

 Archer in Pritch. Inf. p. 728. T. III. F. 11. Hassall Freshw. p. 380. 

 X. 2. T. 91. F. 1. Rabenh. Krypt. Flor. v. Sachs. p. 185. Alg. 

 N. 303 et 1212! De Xtris Element. p. 34. N. 11. T. II. F. 11. Euastr- 

 Pecten Ehrb. Abh. 1831! Inf. p. 162. X. 194. T. XII. F. IV. Ktz. 

 Spec. p. 172. X. 5. Focke Phys. Stud. I. p. 44. T. II. F. 10. Cos- 

 marium sinuosum Corda Almanach de Carlsb. 1835. T. II. F. 21. Cosm. 

 oblongum Breb. in Menegh. Synops. in Linn. 1840. p. 221. X. 14. 

 Echinella oblonga Grev. in Hook. Brit. Flor. V. 2. p. 398.). E. magnum, 

 diametro duplo triplove longius , oblongum , profunde constrictum, sinu 

 angusto, a latere oblongo-lanceolatum, utroque polo truncato leniter 

 retusum, ambitu undulato-sinuatum ; semicellulis (fronte) sinuato - quin- 

 quelobis, basi et in quoque lobo tumore instructis, lobis lateralibus in 

 apice dilatato sinuato-retusis, inferioribus latioribus quam superior., lobo 

 polan late cuneato, in apice profunde inciso, angulis omnibus rotundatis , 

 cytiodermate laevi ; zygosporis globosis verrucosis, verrucis obtuse conicis 

 achrois hyalinis. v. v. 



Long. i/ 16 — i/ 14 '" = 0,0057 — 0,0065", lat. max. l / 2 6'" = 

 0,00346". 



b. oblongiforme (Euastrum oblongiforme Cram. in Rabenh. Alg. 

 sub Xo. 1445. Hedwigia II. p. 64. X. 5.), differt inprimis tumorum 

 numero et dispositione. 



Hab. in stagnis per totam Europam. 



E. crassum (Breb.) Ktz. (Phycol. germ. p. 135. X. 13. Spec. 

 Alg. p. 172. X. 8. Ralfs Brit, Desmid. p. 81. X. 3. T. XI. F. 3. 

 Archer in Pritch. p. 728. Breb. Liste p. 122. X. 2. Rabenh. Krypt. 

 Flor. v. Sachs. p. 185. Alg. X. 1226 et 1708! De Xtris Element. 

 p. 34. X. 12. T. II. F. 12. Cosmarium crassum Breb. in Menegh. 

 Synops. in Linn. 1840. p. 222. X. 18. Desmaz. Cr. de Fr. ed. I. 

 X. 1104. ed. II, X. 504. Euastrum Pelta Hassall Freshw. Alg. p. 380. 

 X. 3. T. 91. F. 3.). E. oblongum, diametro subtriplo longius , pro- 

 funde constrictum, sinu angusto lineari, e vertice subquadrangulare, 

 utroque polo profunde excisum, angulis rotundatis ; semicellulis (fronte) 

 tnlobis, basi et in quoque angulo tumore instructis , lobis lateralibus 

 lahssimis unisinuatis , lobo polari paullum prominente , in apice bifido, 

 segmentis late rotundatis ; cytiodermate distincte punctato, punctis in 

 series transversas ordinatis. v. v. 



