292 Bacillariese, Naviculacea^, Schizonema. 



ad 10 mm. alto, viridi aut flavescenti-viridi, cartilagineo-gelati- 

 noso, ca^spitoso, filis ratnosissimis, ramis saepius medio tumidis et ad 

 apices in ramulos tenues solutis, aliis ramis vero tenuioribus et 

 irregulariter dichotomo-ramosis. 



Hab. ad «Pirano» Istriae et in oris Dalmati:e (Titius). — Schi- 

 zonemati laciniato quoad striaturam affine. 



33. Schizonema corymbosum Ag. Syst. p. 11, Consp. p. 21!, Grun. 12J 

 in Bot. Centr. 1880, p. 1515, V. H. Syn. t. 15, f. 21, non Micro- 

 mega corymbosum Kuetz. Bacill. p. 117, t. 27, f. IX, Species 

 p. 107, Micromega corymbosum Pritch. Inf. p. 931. — Pseudo- 

 thallo basi subcrassa firma, dendroideo-ramosissimo, pallide oliva- 

 ceo, 2-5 cm. alto, ramis apice penicillato-corymbosis ; frustulis 

 dense seriatis; valvis elliptico-lanceolatis, utroque fine obtuso-rotuu- 

 datis, nodulo centrali oblongo-rotundato; striis radiantibus, lineam 

 mediam attingentibus, 20-21 in 10 a. 



Hab. ad algas varias imprimis Corallinas ad oras Europa? 

 borealis (Agardh, Bonnemaison). — Var. japonicum Grun. in B. C. 

 1880, p. 1515, Cfr.V.H. Syn. t. 15, f. 29, 32: typo simillimum, ca-spi- 

 tibus usque ad 25 mm. altis, sordide olivaceo-viridibus, ramosissi- 

 mis, ad apices ramulis umbellatis numerosis brevibus vel inflatio- 

 nibus irregulariter glomeratis praeiitis, filis deorsum fere 50 u. cras- 

 sis. Ad «Yokohama» (R. et G. Gaertner). — Intra tubulos occur- 

 rit frequenter Nitzschia iubicola Grun. var. et Berkeleya ruiilans. 



B. Radiosa Grun. in Bot. Centralbl. 1880, p. 1515, p. p.: Valvae eas Na- 

 vicularum e sectione «Radiosa^» referentes, striis transversis delicate pun- 

 ctatis medio radiantibus, in apicibus suboppositis donatas; puncta in lineas lon- 

 gitudinales non ordinata. Area levis rotundata, parva, circa nodulum centra- 

 lem prasens. Noduli termiuales subapicales. 





34. Schizonema tenue Ag. Consp. p. 21, Grun. in Bot. Centr. 1880, 1205 

 p. 1516, V. H. Syu. t. 15, f. 34, Schizonema mucosum Kuetz. 

 Bacill. p. 115, t. 26, f. 9, Species p. 104, non W. Sm., Micromega 

 mucosum Pritch. Inf. p. 933? — Pseudothallo maxime mucoso, 

 molli, filamentis obsoletis contiguis confluentibusque; frustulis ma- 

 ximis, seriatis; valvis 68-72 u.. longis, lanceolato-oblongis, apice 

 obtusis, e facie connectivali oblongis, apice late truncatis. 



Ilab. ad lapides iu mari adriatico ad Tergeste (C. Agardh, 

 Rudolphi) et in cauali anglico, ad «Brest» (Desmazieres). — An 

 huc Phlyctamiai species? — Var. americanum Grun. iu V. H. Syn. 

 t. 15, f. 35, B. C. 1880, p. 1516: tubulis distinctius discretis, caa- 



