Bacillariefe, Fragilariaceae, Synedra. 651 



Grammonema Ag. — Est Fragilaria frustiilis imperfecte siliceis (An satis 



distinctum genus?). 

 Clavioula Pant. — Frustula elongata, polis incrassatis, valva^ duabus areis 



levibus longitudinalibus percursae. 

 Cymatosira (Irun. — Frustula e zona connectivali visa undulato-arcuata; 



valva3 lanceoIatiTe, grosse punctatne (Huic generi aiHne videtnr, teste Cleve, 



genus Rutilaria Grev.). 

 Campylosira Grun. — Valvas cymhelliformes, sparse punctatnf, pseudorhaphe 



nulla; zona connectivalis arcuata (Frustula in fascias conjuncta). 

 lihaphoneis (Ehr.). - FrustuUi quadrangulo-linearia, angusta, simplicia, na- 



vicularia, valvse late lanceol. v. ovatce, striis vel costis transversis (ubi 



adsunt) vitta vel area longitud. interruptis. Obs. Species costas in valvis 



prsebentes secernendae. 

 ? Terebraria Grev. — Frustula quadrangularia, binatim conjuncta, linea su- 



turali crenulata; valvte ellipticae, granulis margaritaceis remotis seriatis 



ornat;e. [Ad genus Trachijspheniam Petit transiens]. 



SYNEDRA P:!ir. [1830] m Ber. 1830, p. 40, Infus. p. 210, era. (Etym. 

 synedrion consessus), Kirchn. Alg. Schles. p. 207. Briin Diat. Alp. 

 p. 122, V. H. Syn. p. 148 {Eusynedra), (3run. in Wien. Verhandl. 

 1862, p. 384, De-Toni Osserv. Tasson. Bacill. 1890, p. 905, Exi- 

 laria Grev. [1830] Syn. p. 38 pro parte, Sc. Cr. Fl. V, t. 298, 

 EchincUcB, Frustulice, Bacillarice, Diatomatis, Naviculcu, Falca- 

 tellcB sp. auct. Campyloslylus Shadb. mscr., Ctenophora Br6b. mscr. 

 — Valvae pro ratione valde elongatae, plus minus lanceolatae vel li- 

 neares, subinde paullulum arcuatae, pseudorhaphe vel area longitu- 

 dinali hyalina soepius donatae, in nonnullis speciebus pseudonodulis 

 centrali terrainalibusque instructas. Frustula affixa. Phaeophora la- 

 minaeformia, bina, margine denticulata vel laciniata. 



Obs. Species auctoram veterum nonuuliae ad Nitzschiam ve\?it^ 

 fuerunt. Species, quae valvas raargine undulatas etc. ostendunt, ad 

 Toxarium,a.\\?e, quae sulcos marginales priebent, ad ArcZ/ssonmm 

 retuli, nonnullae falcatae (in hoc genere asservatae) fortasse ad Pseu- 

 clo-eunotiam seu ad Campylosiram pertinere videntur. 



1 



, Synedra pulchella (Ralfs) Kuetz. Bacill. p. 68, t. 29, f. 37, Rabenh. 2582 

 Siissw. Diat. p. 56, t. 5, f. 17, Fl. Eur. Algar. I, p. 131 excl. var. b., 

 W. Sra. Br. Diat. I, p. 70, t. 11, f. 84, t. 30, f. 84*, Pritch. Inf. 

 p. 786, t. 4, f. 28, 0' M. Ir. Diat. p. 303, t. 28, f. 17, CI. et Grun. 

 Arct. Diat. p. 107, t. 6, f. 120, V. H. Syn. p. 149, t. 40, f. 28-29, 

 et t. 40, f. 27, t. 41, f. 1 (f. rnajor), Syneclra socialis Rabenh. 

 Flessw. Diat. p. 56, t. 4, f. 22 (frustulis fasciculatis), Synedra sa- 

 xonica Kuetz. Bacill. p. 68, t. 15, f. 14, Exilaria fasciculata 



42 



