Myxophycese, Cliroococcaceae, Tetrapedia. 111 



giilaritor dispositis compositis; contentu pallide lerugineo, iion gra- 

 nuloso. 



Hah. Holmicu (Lageriieim), Pragai (Hansgirg), Dresd^e (Wollny) 

 ct iii Hibcrnia et Scotia (Westj. 



2. Holopedium sabulicolum (Lagerh.j Kirch. in E. et P. 1. c. Lagerh. 283 

 in W. N. et L. n. 15491 Merismopedium (Holop.) sabulicoliim 

 Lagerh. Bidr. till Sver. Algfl. p. 43, t. I, 7-8. — Familiis granulis 

 arenae affixis e cellulis numerosis, 3-4 [x. diam. 6 \i.. longis, irre- 

 gulariter dispositis, confertis compositis; contentu laete a!rugineo 

 non granuloso. 



Hab. ad «Kristineberg» in mari Bahusiensi in consortio spe- 

 cierum Merismopedii supra dictarum eodem in loco (Lagerheim). 



Subgen. II. MiCROCROCis (Richt.) nob. — Cellulse majores bacilliformes. 



3. Holopedium geminatum Lagerheim Holopedium et Microcrocis in 284 

 Nuova Notarisia 1892, Merismopedium (Holop.J geminatitm La- 

 gerh. Bidr. till Sver. Algtl. p. 43, t. I, Microcrocis Dieteli Richt. 



in H. et R. Phyk. univers. n. 548, Hedwigia 1893, Heft 2 p. 74. 

 — Familiis magnis libere natantibus, e cellulis 6 [a. diam. 12 [x. 

 longis bacilliformibus, numerosis irregulariter dispositis, confertis 

 compositis; contentu la3te aerugineo, non granuloso. 



Hah. Hohnise in lacu Hammarbysjon prope «Danviken^> Scan- 

 dinaviae (Lagerheim) et prope Lipsiam Germanite (Dietel). 



TETRAPEDIA Reinsch [1867] Algenfl. von Franken p. 37 (Etyin. tetras 

 quatuor et pedion planities), Cooli;e Brit. Freshw. alg. p. 215 et seq., 

 Kirchn. in E. und P. Nat. Pflanz. p. 57. — Cellulae solitariie aut 

 raro consociatione individuoruin plurium familias ex cellulis binis, 

 quaternis aut 16-nis extructas constituentes, quadratie, cellula sin- 

 gula incisuris angulosis in cellulas filias quaternas dilapsa. Celluhe 

 filia3 post divisionem individuas singulas se prtebentes, incisurarum 

 directio in marginum lateralium directione perpendiculari aut in 

 angulo semirectangulo versa; contentus granulosus saepius colore 

 a^rugineo donatus. 



1. Tetrapedia Morsa W. et G. S. West Freshw. Alg. of Madagascar 285 

 in Trans. of the Linnean Soc. of London 1895, p. 85, t. V, f. 3. 

 ■ — Minutissima, circa diam. aequilonga, 6-7,2 [j.. lat , modicc con- 

 stricta, sinu semielliptico, semicellulis subrecte angularibus, late- 



