678 Bacillariese, Fragilariace«, Asterionella. 



1867, p. 4. — Longa vel longissima, sicca flavescens, linearis, un- 

 dulata, in media parte tumidula, tumore lineari oblongo (50 ::5 12), 

 apicibus subclavatis, 5-7 p.. latis, rotundato-truncatis ; striis trans- 

 versis tenuibus, 20-22 in 10 fx., pseudorhaplie nulla. 



Hab. inter Sargassa ex «Hoiiduras» reportata (Lindig). 



ASTERIONELLA Hass. [1855] in Micr. Exam. p. 10 (Etyra. aster ob 

 frustula stellatim conjuncta), Rabenh. Fl. Eur. Algar. I, p. 141, 

 V. H. Syn. p. 154, De-Toni Osserv. tasson. Bacill. p. 905. — Val- 

 vae anguste lineares, apicibus insequaliter capitatae h. e. quasi cla- 

 vulaeformes. Frustula e facie connectivali visa linearia, apicibus 

 inEequaliter tumida, basi connata stellato-radiantia. 



1. Asterionella formosa Hass. in Micr. Exam. p. 10, Micr. Journ. 269i 

 VIII, t. VII, f. 8, W. Sm. Br. Diat. II, p. 81, Heib. Consp. p. 68, 



t. VI, f. XX, Brun Diat. AIp. pag. 127, t. 1, f. 12, V. :H. Syn. 

 p. 154, t. 51, f. 19-20. — Valvis anguste linearibus, 70-100 a. 

 longis, e basi valide capitata magis magisque apicem versus atte- 

 nuatis, sub apicibus leniter constrictis; striis subtilibus, circiter 17 

 in 10 a., pseudorhaphe angustissima areaque hyalina basilari in- 

 terruptis; frustulis e facie connectivali visis deorsum valde tumidis. 

 Hab. in aqua dulci AnglicB ad «Liverpool, Cheshire» (Hassall, 

 W. Smith), Galliae prope « Falaise » (De Brbbisson), Danife (Hei- 

 berg), Helvetias (Brun), in lacu « Bracciano)) Italise (Lanzi); in 

 lacubus Americse. 



2. Asterionella gracillima (Hantz.) Heib. Consp. pag. Q^, t. 6, f. 19, 2692 

 Rabenh. FI. Eur. Algar. I, p. 141, Diatoma gracillimum Hantzsch 



in Rabenh. Alg. n. 1104 cum icone, Krypt. FI. v. Sachsen p. 32, 

 Asterionella form.osa var. gracillima Grun. in V. H. Syn. p. 155, 

 t. 51, f. 22. — Valvis gracillimis, ad 50-125 [j.. lougis, utroque 

 fine gequaliter incrassatis, subcapitatis. 



Bab. ad ripam Albis prope ((Dresdamn Germaniae (Hantzsch), 

 in Dania (Heiberg), Silesia (Kirchner) et Belgio (Van Heurck). — 

 An, ut docuit Grunow, mera varietas Asterionellce formosce Hass. ?, 



3. Asterionella Ralfsii W. Sm. Br. Diat. II, p. 81, Pritch. Inf. p. 779, 



t. 4, f. 18, V. H. Syn, t. 52, f. 2, Micr. Journ. I, p. 1, f. 9, Dia- 2693 

 ioma stellare Ralfs teste Sm. — Exacte linearis vel e basi dila- 

 tata in apicem subcapitatura leniter attenuata, 45 u.. longa; striis 

 transversis obscuris. 



Hab. in aqua dulci Anglise (W. Smith). — An Asterionellce 

 formosce Hass. mera varietas ?. 



