Oonjugatie, tiesmiJiacea', Closterium. 841 



00. Closterium Venus Kuetz. Phycol. genn, p. 1,30, Spoc. .\lg. p. 1G4, 2012 

 Ralfs Brit. Desmid. p. 220, t. XXXV, f. 12, Breb. Liste p. 150, 

 Cleve Bidrag p. 491, Desinaz. Cr. de Fr. ed. nov, n. 120 1, Rabenli. 

 Fl. Eur. Algar. III, p. 134, Hansg. Pi-odr. p. 1S2, ClosleriiAm Dia- 

 nce , d. Venus Klebs Preuss. Desni. t. I. — Parvuin, plus minus 

 gracile, semioirculare, 8-1 1 a. latum, octies-duodecies longius quani 

 latum, in apices subacutos requaliter sensimque attenuatum ; mem- 

 brana tenui, levi, hyalina; chlorophoris obliteratis; pyrenoidibus 

 in utraque semicellula 3-4; locello distincto, corpusculis 4-6 re- 

 pleto. 



IFab. in fossis inter Algas majores Germanise, Gallia3, Suecice, 

 Boheniiae, Groenlandi;p, Ilungariai, Rossise, Fenniae; etiain in Birma- 

 nia Asiae (Josiiua), et Japonia (RoY, Bisset). — Cum Ciosferio 

 Biancv sajpe confusum. 



61. Closterium parvulum Naeg. Einz. Alg. p. 106, t. VI, C. f. 2, De- 2013 

 Bary Conjug. t. V, f. 14-23, Rabenh. Alg. sub n. 1338!, Fl. Eur. Al- 

 gar. 111, p. 134, Wolle Desm. U. S. p. 45, t. VII, f. 7, t. VIII, f. 16, 

 Hansg. Prodr. p, 182. — Parvum, semicirculare, medio non tumi- 

 dum, gracile, anguste lanceolatum, 7-16 u. latum, sexies-octies lon- 

 gius quam latum, apicibus acutis; membrana tenui, levissima, eva- 

 cuata nonnunquam luteolo-fuscescente et subtiliter striata; pyre- 

 noidibus uniseriatis, in utraque semicellula 2-4, rarius 1-7; chlo- 

 rophoris 4-5; locellis haud acute definitis. 



Hab. in aquis stagnantibus Helvetiae ad Turicum (Naegeli), 

 prope Friburgum brisgoviense (De-Bary), ad Dresdam (Hantzsch), 

 prope Vindobonam Austria^ (A. Grunow), ad «Schwarzenberg» in 

 Austria superiore (D. Poetsch), in Tyrolia (De Heufler), pr. 

 «Salzburg» (D, Sauter), in Bohemia (Schroeter, Hansgirg), Hi- 

 spania (D."* M. Lewin), Rossia (Artari), Hungaria (Istvanffi), 

 Sibiria (Roldt), Groenlandia (Boldt) et America boreali (Wolle); 

 ad «Mauna Kea» ins. Sandwic. (Nordstedt). 



62. Closterium Cynthla De-Not. Elem. Desm. p. 65, t. 7, f 71, Cooke ^oh 

 Brit. Desm. p. 26, t. 13, f. 2, Nordst. Freshw, Alg. of N. Zeal. 

 and Austral. p. 69, Closleriiwi ruficeps Ehrenb. Entwick. Infus. 



p. 67, Beitr. Erk. gr. Organ. p. 238 (94) sec. Nordstedt, Closterium 

 Archerianum c Cyniliia Klebs Preuss. Desm. p. 13, — Elonga- 

 tum, fusiforme, 104-180 :; 11-22, sensim e medio ad apices 8 p.. la- 

 tos versus attenuatum, apicibus obtusis, eleganter arcuatis, semi- 

 circularibus ; endochromate denso, medio interrupto ; locello termi- 

 nali corpusculum singulum trepidans fovente; membrana succinea, 



