290 Bacillarieae, Naviculaceffi, Schizonema. 



licatioribus Schizonematis se/acei simile filamentis deorsum tenui- 

 bus ecoloribusque, frustulis paullo rninoribus, fere Schiz. sirosper- 

 mi, oblongis, truncatis, differre videtur. 



25. Schizonema sirospermum Kuetz. Spec. p. 109 (sub Micromega), lisl 

 Rabenh. Fl. Eur. Algar. I, p. 279, Grun. in B. C. 1880, p. 1514, V. 



H. Syn. t. 15, f. 19. — Pseudothallo crassiusculo, rigido, olivaceo, 

 cartilagineo, ramosissimo, ramis inaaqualibus, vage curvatis, se- 

 taceis; naviculis dense seriatis, lanceolatis, ad 36 a. longis, in 

 tubulis distinctissiinis, saepe in spermatia «?» globosa concatenata 

 infiatis. 



Hab. ad oras Angliae. (Meneghini, Kuetzing). — Fortasse 

 forma Sch. setacei. 



26. Schizonema spinescens Kuetz. Bacill. p. 118, t. 27, f. XI (sub 1197 

 Micromega), Grun. in B. C. 1880 p. 154, non Schizonema spinescens 

 Menegh.! — Pseudothallo humili, 1-1,5 cm. alto, rigido, ultra seta- 

 ceo, sursum parum dilatato, ramulis terminalibus acutis spine- 

 scentibus subumbellatis, seriebus tubulisque internis distinctissimis 

 confertis; valvis lanceolatis, frustulis e facie connectivali visis 

 oblongis, truncatis, 25-35 a. longis [spermatiis? internis globosis]. 



Hab. in mari adriatico, ad Tergeste (Kuetzing). 



27. Schizonema chondroides (Kuetz.) Menegh. in Rabenh. Fl. Eur. n9 8 

 Algar. I, p. 280, Grun. in B. C. 1880, p. 1514, Micromega chon- 

 droides Kuetz. Bacill. p. 118, t. 25, f. VIII, 1-5, Sp. p. 108. — 

 Pseudothallo minuto, 4-9 mm. alto, cartilagineo, olivaceo, ramulis 

 terminalibus aggregatis, clavatis, obtusis, hinc inde piloso-spinescen- 

 tibus ; seriebus tubulisque internis distinctissimis confertis ; navi- 

 culis membranaceis, flaccidis, minutis, ad 20 a. longis (spermatiis? 

 immersis globosis). 



Hab. in mari adriatico, ad Tergeste (Kuetzing, Hauck, Grunow). n9g 



28. Schizonema corniculatum Ag. in Flora 1827, p. 628, n. 14 (sub 

 Micromega), Algar. Europ. t. IV, Consp. p. 24, Kuetz. Species 

 p. 109, Bacill. p. 118, t. 28, f. II, Grun. in B. C. 1880, p. 1514, 

 V. H. Syn. t. 15, f. 15. — Pseudothallo basi dilatato, 2-4 mm. 

 lato, cartilagineo, rigido, 1-2 cm. alto, sursum ramosissimo, sub- 

 fastigiato, olivaceo-viridi vel pallide livido, exsiccatione luteo-fusco ; 

 tubis internis densissime aggregatis et implicatis; ramis divarica- 

 tis, ultimis spinescentibus ; naviculis unica serie concatenatis, val- 

 vis anguste lanceolatis, 30-34 a. longis, utroque fine subacutis, 

 nodulo centrali mediocri, oblongo-rotundato; striis transversis pa- 

 rallelis, subrectis, rhaphen attingentibus, 20-22 in 10 >/.. 



