Bacillarieae, Naviculacese, Schizonema. 285 



t. 15, f. 22-24, Micromega molle Pritch. Inf. p. 931. — Pseudothallo 

 ad 2,5 cm. alfo, valde gelatinoso, fllis in membranam laciniatam 

 confluentibus, frustulis sublate lanceolatis, 27-40 - 10-11, apicibus 

 subacutis, nodulo centrali mediocri rotundato ; striis transversis 

 rectis, rhaphen attingentibus, 18-10 in 80 jj.. 



Hab. ad oras Angliae, Hiberniae (W. Smith, Cutler), ad «Aber- 

 deen» Scotise (Dickie), ad «Gourvelle» (Arnott), prope « Luc » 

 Gallise in Sphacelaria. 



13. Schizonema mucosum W. Sm. Br. Diat. p. 75, t. 57, f. 360, H84 

 Grun. in B. C. 1880, p. 1510, V. H. Syn. t. 15, f. 19 non Kuetz. 



— Pseudothallo filiformi, circ. 5 mm. alto, gelatinoso, deorsum sim- 

 plici, ob cohaerentiam superne membranaceo, margine irregulariter 

 ramuloso, frustulis seriatis, paucis, subdistantibus, valvis ellipticis, 

 22-32 \j.. longis, delicate striatis. 



Hab. in aquis marinis prope «Brighton» Britanniae (W. Smith). 



14. Schizonema laciniatum Harv. Manual p. 510, W. Sm. Br. Diat. II. H85 

 p. 79, t. 59, f. 370, Grun. in B. C. 1880, p. 1510, V.H. Syn. t. 15, f. 25, 

 Micromega laciniatum Pritch. Inf. p. 932. — Pseudothallo e basi 

 subsimplici crassa ramosissimo, ramis fasciculatim intricatis, valde 

 lubricis, quasi conglutinatis, fasciculis sursum dilatatis, circiter 5 

 cm. altis frustulis, numerosissimis, irregulariter dispositis, valvis 

 ellipticis, 35-36 \x. longis, utroque fine subacutis, nodulo centrali 

 distincto rotundato, striis subradiantibus, delicatissimis, 20 in 10 u., 

 rhaphen attingentibus. 



Hab. ad oras Angliae, Galliae australis, in mari mediterraneo 

 passim, ad Tergeste (Hauck). 



15. Schizonema mesogloeoides Kuetz. Spec. p. 103, Rabenh. Fl. Eur. 1186 

 Algar. I, p. 264, f, 69, Grun. in B. C. 1880, p. 1510, V. H. Syn. 



t. 15, f. 27, Dickieia pinnaia Ralfs in An. Nat. Hist. 1851, t. 5, 

 f. 6, W. Sm. Br. Diat. II, p. 66, t. 54, f. 343, H. L. Sm. Sp. T. 

 n. 138, Pritch. 1. c. sub Micromega. — Pseudothallo 2-5 cm. 

 alto, maxime gelatinoso, dilute viridi, vage ramosissimo, pluries 

 pinnato, ramis densis, numerosis, inaequalibus, ramulis apice incras- 

 satis, patentibus, tubo achromatico pellucido primario pennae me- 

 rulse vel passerinse crassitie; frustulis subirregulariter aggregatis, 

 densis, valvis elliptico-lanceolatis, 20-45 ,u. longis, utrinque atte- 

 nuatis obtusisque, rhaphe recta, nodulo centrali subrotundo, striis 

 transversis parallelis, rectis, rhaphen attingentibus, 15-16 in 10 [j.., 

 frustulis e facie connectivali visis oblongis, truncatis, altero apice 

 attenuatis, 



