430 Bacillarieae, Gomphonemaceae, Gomphonema. 



Gruoow, Gomphonema ros/raimnW. Sm. Br. Diat. II, p. 99, Rabenh. 

 Fl. Eur. Algar I, p. 287, Gomphonema ienellum W. Sm. Br. Diat. I, 

 p. 80, t. 29, f. 243, non Kuetz., [non Gomphonema sphrerophorum 

 Ehr. quse species ad Gomph. acuminaium pertinere videtur]. — Val- 

 vis lanceolato-cuneiformibus, 20-30, y.. longis, apicibus attenuato-ro- 

 stratis; striis transversis rhaphen subattingentibus, mediis valde ab- 

 breviatis, ceteris sequilongis, radiantibus, ad 14 in 10 u.; frustulis sti- 

 pite subsimplici, subinde in gelatinara diffluente fultis, e facie con- 

 uectivali visis exacte angusteque cuneatis. 



Hab. in aquis dulcibus passim, imprirais in Anglia (W. Smith), 

 Neerlandia (Suringar), Germania (Kuetzing, Rabenhorst), Gallia 

 (Brebisson), Austria (Grunow), montibus tatricis (Schumann), Po- 

 lonia (Lopott, Sypniewski, Gutwinski), Galicia (Raciborski, 

 Gutwinski), Italia (Malinverni, Passerini, Balsamo, Ardissone, 

 1'iccone); iu lacu u Wahiria » in insula « Tahiti » (Frauenfeld 

 sec. Grunow) ad Rhizoclonium; in aquis stagnantibus prope 

 (( Tocunga » in ^Equatoria Americse australis (Istvanffi). — Cfr. 

 var. lanceolatum V. H. Syn. p. 125, t. 25, f. 10, et var. subcapitatum 

 V. H. Syn. p. 125, t. 25, f. 11. 



24. Gomphonema? asymmetricum Gutw. Mat. fl. Galycyi 1890, p. 28, 1747 

 tab. 1, fig. 24, Nuova Notarisia 1890, pag. 190, — Valvis elon- 

 gato-ellipticis, 26,8 $ 7,2-8, altero latere recto, altero triundulato, 

 apicibus rotundatis, ad 5,6 ut. latis, inferiore parum angustiore ; 

 nodulo centrali parvo oblongo; striis transversis radiantibus, 6,8 



tfi 10 [i., rhaphen subattingentibus, medio (latere triundulato) in- 

 terruptis; frustulis e facie connectivali visis parura curvato-cuneatis. 

 Hab. in aquis dulcibus « Majscowa » prope « Jaslo » Galiciee 

 austriacae (R. Gutwinski). — Latitudo lateris super. 7,5 fa latit. 

 later. infer. 6 u. « An potius Rhoicosphenia? » 



25. Gomphonema bengalense Grun. in V. H. Syn. t. 24, fig. 37-38 m* 

 (noraen). 



Hab. in Bengalia. 



26. Gomphonema mexicanum Grun. in V. H. Syn. t. 24, f. 3 (nomen). i™' 



Hab. in Mexico (Grunow); in lacu S. Pauli Aequatorise (Ist- 



VANFFI). 



Sectio II. Species Symmetkic^e Grun. in V. H. Syn. p. 123, Atlas t. 25. — 

 Valvsa puncto solitario unilaterali prope nodulum centralem carentes ; 

 utrumque latus valvse simile. 



27. Gomphonema exiguum Kuetz. Bacill. pag. 84, t 30, f. 58 (non 1750 

 exacte!), V. H. Syn. p. 126, t. 25, f. 34!, Gomphonema hyalinum 



