Conjugatcie, Desmidiacea}, Closterlum. 837 



II. n. 1353! cuin icone, Echinella acuta Lyngb. Hydr. Dan. p, 209, 

 t. 69, G. — Parvum, anguste lanceolatum, love, 110-140 =; 8-12, 

 levissime curvatum, (nonnunquam sigmatoideum, in utrumque po- 

 lum sensim attenuatum, apicibus subacutis; pyrenoidibus in utra- 

 que semicellula 3-4 (omnibus :ietatibus omnibusquo in individuis 

 non semper distinctis); zygotis e fronte visis quadrangularibus, e 

 vertice ellipticis. 



Hab. in aquis stagnantibus in Fennia (Elfving), Belgio (De-\Vil- 

 deman), Hungaria (Istvanffi), Rossia (Artari), Gallia (Brebisson), 

 Britannia (Ralfs, Cooke), Dania (Lyngbye), Suecia (Cleve, Wit- 

 TROCK, Lundell), Germania (Rabenhorst, Klebs, Kuetzing), Nor- 

 vegia et Spitzbergia (Nordstedt), Nova Semlia (Wille), Austiia 

 (Grunow) et America boreali (Wolle); in Groenlandia (Boldt); in 

 Birmania (Josiiua); ad « Dunedin» in Nova Zelandia (S. Berggren). 



— Forma tenuius Nordst. Freshw. Alg. N Zeal. and Austral. p. 70, 

 t. III, f, 27: cellulis minoribus; zygotis rectangularibus, 40=; 22, 

 lateribus leviter retusis, apicibus concavis, angulis e basi lata sen- 

 sim acuminatis I. cuspidatis ; vegetativis cellulis indagandis. Crass, 

 cell. conjug. 3-4,5 y.; long. 43 jj.. Ad «Omatangi» in Nova Zelan- 

 dia (S. Berggren). 



49. Closterium fasciculatum Jacobs, Aperg p, 174 (absque diagnosi) 2001 



— Closterio Ccratio Perty proximum at semper fasciculatum ut 

 Closterium acuium Breb, 



Ilab. locis variis Dani?e (Jacobsen), 



50. Closterium Ceratium Perty Kl. Lebensf. p. 206, t. XVI, f. 21, 2002 

 Rabenh. Fl. Eur. Algar. III, p. 138, Lund. Desm. Suec. p. 82. — 

 Angustissime lineari lanceolatum,subrectum vel levissime curvatum, 

 nonnunquam sigmatoideum, utrinque longe porrectum, apicibus acu- 

 lissimis, hyalinis, vicies-quadragies longius quam latum ; pyrenoidi- 



bus in utraque semicell. 5-7, in serie unica axili dispositis; lo- 

 cello nuilo. Diam. 7-9 [>.. 



Hab. in fossis turfosis Ilelvetia} ad « Grimsel, St. Gotthard » (Per- 

 ty), in similibus locis montium nietalliferorum Saxonia^, in palude 

 parva montium circa « Marstran » ad Gothenburgum (A. Raben- 

 iiorst) nec non ad «R;ippe'> in Suecia (Lundell). 



51. Closterium aciculare West in Mic;-. Journ. 1800, VIII, p, 153, 2003 

 t. 7, f. 16, Archer in Micr. Journ, II, 1862, p. 81, VI, 1860, p. 181, 

 Cooke Brit, Desm. p. 36, t. 15, f, 1. — Cellulis elongatis, 500 s5, 

 gracillimis, rectis (apicibus leniter introrsum incurvis) e medio api- 



ces acutos versus sensim attenuatis; membrana haud striata. 



