836 Conjugata;, Desmidiace*, Closterium. 



n^Am c Cornu Klebs Preuss. Desm. p. 19, t. 2, S(au)'ooeras Cornu 

 Gruu. Desni. Austr. p. 497, Clost. tenue Kuetz. ia Linn. 1833, 

 p. 595, n. 2, f. 78. — Parvum, tenuissitnum, (3-8 u.. latum, leviter 

 curvatum, subcylindricura, leve, utroque polo pauUulum attenua- 

 tum, vicies-tricies longius quam latum (ad 170 y.. long.) medio vi- 

 ride, ex.treraitatibus hyalinis, aclirois, apicibus obtusis; chloropho" 

 ris undulatis; pyrenoidibus indistinctis, uniseriatis; locellis indistin- 

 ctis; membrana hyalina, striis destituta; zygotis (e fronte visis) 

 quadrangularibus, (e vertice) ellipticis. 



Hab. in fossis, stagnis turfosis per Europam e gr. in Fennia(ELF- 

 ving), Belgio (De-Wildeman), Rossia (Artari), Germania (Eiiren- 

 BERG, Rabenhorst, Klebs), Austria (Grunow), Buhemia (Hansgirg), 

 Gallia (Brebisson, Petit), Italia (De-Toni, Levi), Suecia (Lun- 

 dell, Cleve), Norvegia (Nordstedt), Hungaria (Istvanffi), Nova 

 Semlia (Wille), Britannia (Ralfs, Cooke). — Forma tumidum Ra- 

 benb. FI. Eur. Algar. III, p. 137, Cooke Brit. Desm. p. 35, Closte- 

 rium tenue Kuetz. I. c: medio paulo tumidum, subventricosum, ad 

 l\ IJ., latura, circ. 110 a. longum, apicibus magis attenuata. Cum 

 specie passira. 



47. Closterium subtile Breb. Liste 153, n. 32, t. II, f, 48, Rabenh. \m 

 Fl. Eur. Algar. IH, p. 138, Hansg. Prodr. p. 181, n. 336, WoIIe 

 Desra. U. S. p 158, t. VII, f. 2. — Omnium fere minimura, subti- 

 lissiraum, subrectum, angustissirae lanceolatum, medio 2,5-1 p.. la- 

 tum, circ. 12 a. longura, utrinque acutissime cuspidatum, aciculare; 

 membrana levi. 



Hab. in stagnis, aquariis, stillicidiis, rupibus madidis Galliae, 

 Gerraaniae, Bohemiae, Americae borealis; in Birmania (Joshua). — 

 Suadente Cooke Brit. Desm. p. 37, videretur forsan idem ac Closte- 

 rmm Griffithii ( = Rhaphidium). 



48. Ciosterium acutum (Lyugb.) Breb. in Ralfs Brit. Desmid. p. 177, 2000 

 n. 22, t. XXX f. 5 et XXXIV f. 5, Archer in Pritch. luf. p. 750, ^ 

 Breb. Liste p. 154, n. 28, Perty KI. Lebensf. p. 206, t. XVI, f. 22, 

 De-Bary Conjug. t. V, f. 13, Rabenh. Alg. ed. I, n. 364 et 1938!, 



FI. Eur. Algar. III, p. 137, Lund. Desm. Suec. p. 82, WoIIe Desm. 

 U. S. p. 44, t. 7, f. 11-12, Cooke Brit. Desm. p. 35, t. 14, f. 5, 

 Closterium {Asteroselene) acutitm Wittr. Skatid. Desm. p. 24, Clo- 

 sterium pronum var. acitium Klebs Desra. Preuss. p. 19, Stau- 

 roceras acuium Grun. Desm. Austr. p. 497, FrustuHa acuta 

 Kuetz. in Linnaea 1833, p. 537, Closterium tenerrimum Kuetz. 

 Pliyc. germ. p. 130, Cleve Bidrag n 18, Desmaz. Cr. de Fr. ed. 



