Bacillarieae, Fragilariacepe, Ardissonia. 675 



major Kuetz. Actien 1836. — Marina, robusta, valvis late liriearibus, 

 300-550 a. long., apicibus leniter contractis subcapitatis rotundatis ; 

 striis 11 in 10 a., sulcis tribus aequidistantibus percursis. 



Hab. imprimis ad Poly si p ho ni as in mari adriatico et me- 

 diterraneo; ad oras Angliae et Lusitanise. — Var. minor Grun. loc. 

 cit. : valvis 160-180 « 14-15, striis transversis lOy^-l^ in 10 y.., 

 delicate punctatis. Ad oras Finmarchise. 



4. Ardissonia robusta (Ralfs) De Not. in Erb. critt. ital. Ser. II, 267-^ 

 n. 334!, N. Giorn. bot. ital. 1871, pag. 95, Grun. in V. H. Syo. 



t. 42, f. 6-7, Si/nedra robusta Ralfs in Pritch. Inf. p. 789, t. VIII, 

 f. 3, Rabenh. Fl. Eur. Algar. I, p. 139. — Linearis, latissima, valvis 

 ellipticis, utroque fine obtuse rotundatis, 300-450 u.. longis, striis 

 8 in 10 y.., sulcis 5-7 aiquidistantibus interruptis. 



Hab. in algis marinis ad oras insulse Corsicae, Maltae, in mari 

 adriatico ad insulam (cLesina)) (Botteri), in Quarnero (Lorenz); 

 in Codio et Dasyclado ad insulam «Ischia» (Bolle, De No- 

 TARis); fossilis in lignite ad «Livorno)) Italise (Castracane). 



5. Ardissonia? dalmatica {K.\iQiz.), Synedra dalmatica K.\xQiz. Bacill. 2679 

 p. 69, t. 12, f. 11, Rabenh. Fl. Eur. Algar. I, p. 140. — Major; 

 stipite demum elongato subramoso, ramulis apice frustula singula- 



ria linearia, utrinque parum et sensim attenuata, ad 100 u.. longa, 

 apicibus rotundato-truncata gerentibus. 



Hab. ad algas filiformes maris adriatici (Kuetzing); in raari 

 mediterraneo pr. portum messanense (Castracane). — An forma 

 minor Ardissonice robustce De Not.? 



6. Ardissonia pulcherrima (Hantzsch) Grun. in Cl. et Grun. Arct. Diat. 268O 

 p. 108, Synedra pulcherrima Hantzsch Diat. Ostind. 1863, p. 19, 



t. 5, f. 2. — Frustulis octangularibus, apicibus capitato-dilatatis, 

 rotundatis vel obtusiusculis, 240-360 « 17-29, striis validis, pseudo- 

 rhaphe angustissima, sulcis in utroque latere pseudorhaphes binis 

 strias interrurapentibus. 



Hab. in Archipelago Indise orientalis. — Frustula e coeruleo 

 violascentia. 



7. Ardissonia formosa (Hantzsch) Grun. in Cl, et Grun. Arct. Diat. 268I 

 p. 108, V. H. Syn. t. 42, f. 8, Synedra formosa Hantzsch Diat. 

 Ostind. 1863, p. 19, t. 5, f. 3, Grun. Alg. Novara p. 3. — Fru- 

 stulis ut in Ardissonia pulcherrima Grun., 214-310:^16-22, val- 



vis raedio crassioribus, apices versus inconspicue attenuatis ; striis 

 transversis validis; sulcis minus evidentibus. 



