Coiijug;ita3, Desniidiacete, Cbstoriutti. 827 



Desm. subalp. p. 213, t. 17, f. 38-40, Wittr. et Nordst. Alg. aq. dulc. 

 exs. n. 475, 479. 480 ot 840, 841, De-Toni e Levi Fl. Alg. Ven. 

 III, p, 29, Closlerium sfriolaium var. vulgaris Jacobs. AperQu 

 p. 176, Closlerium slriolatam a lypicus Klebs Preuss. Desm, 

 p. 14. — Anguste lanceolato-fusiforme, leviter arcuatum, 30-48 ^. 

 latum, diametro 8-12-plo fere longius, 330-370, a. long., utroque 

 polo paulum sensimque attenuatum, apicibus truncatis sa^pe fusce- 

 scentibus; membrana distinctissime striata (striis 5-10 n. 10 ,a.), 

 vacuata prajcipue ad apices fuscescente; pyrenoidibus 5-7 (in una- 

 quaque semicellula); locello apices versus sito, submagno, corpu- 

 scuia 12-20 includente; suturis plerumque tribus; zygotis orbicula- 

 ribus, levibus. 



Hab. in aquis stagnantibus turfosisque imprimis in Italia (De- 

 NoTARis, De-Toni, Levi), Gallia (Desmazieres, Breeisson, Petit), 

 Britannia tota (Hassall, Arciier, Rai.fs, Cooke), Germania (Kir- 

 ciiner, Rabenhorst, Klebs), Hungaria (Istvanffi), Bohemia 

 (IIansgirg), Rossia (Artari), Polonia (Raciborski), Belgio (De- 

 Wildeman), Suecia (Cleve, Lundell, Wittrock), Lapponia ros- 

 sica (NoRDSTEDT), Groeulandia (Boldt), Norvegia (Nordstedt), Spi- 

 tzbergia (Nordstedt) , Dania (Jacobsen), Nova Semlia (Wille), 

 Sibiria (Boldt), Birmania (Joshua), America boreali (Wolle), ad 

 uBlueskinbay et Rotomahana)) in Nova Zelandia (S. Berggren 

 sec.NoRDSTEDT). — var. tumidum Rabenh. FI. Eur. Algar. III, p. 126, 

 Closierium siriolaiiir.i Ralfs I. c. F. d. et e, Rabenh. Alg. sub n. 

 342!: plerumque brevius, diametro maximo 5-10-pIo longius, dor- 

 so distincte tumido. In similibus cum specie locis passim. 

 25. Closterium turgidum Ehrenb. Inf. p. 95, t. VI, f. 7, Ralfs Brit. 1977 

 Desmid. p. 105, t. XXVII, f. 3, Rabenh. Alg. n. 342, sub n. 547 et 

 1367, Rabenh. Fl. Eur. Algar. III, p. 129, Delp. Desra. subalp. p. 

 113, t. 16, f. 24-29, Cooke Brit. Desm. p. 21, t. 9, f. 3, WoIIe 

 Dosm. U. S. p. 41, t. 6, f. 15, Kirchn. Alg. Schles. p. 138, De-Toni 

 e Levi FI. Alg. Ven. III, p. 31, Wittr. et Nordst. Alg. aq. dulc. 

 exs. n. 381, 382, 383, 385, Hansg. Prodr. p. 180, Closierium iitr- 

 gidum a iypicum Klebs Preuss. Desm. p. 20. — Elongatum, anguste 

 fusiforme, 65-74 a. latum, diametro 10-12-pIo-longius, leviter cur- 

 vatum, distincte striatum, utrinque leviter attenuatum ; apicibus 

 conicis, obtuse rotundatis, sa^pius rubescentibus, extrorsuni leniter 

 revolutis; pyrenoidibus in seriem unicam axillarem distributis ; lo- 

 cello apicali mediocri, corpuscula numerosa includente; raembrana 



