818 Conjugatse, Desraiiliaceae, Closteriura. 



nse cellularis cfr. Hauptfleisch Zellmembran und Hiillgallerte der 

 Desmidiaceen 1888, p. 38-42 et p. 54-63. — Cellulye plus minus 

 faicata3 vel lunato-incurvie, raro subrecta?, fusoidete vel cylindra- 

 cese, integrae, apicibus acuminata;, medio haud constricta), junctura 

 mediana transversa, pallidiori, distincta in seraicellulas diias symnie- 

 tricas distincta^; vacuola seu locella prope apices sita, hyalinula, 

 corpuscula plus minus immerosa h. e. gypsi cristallia, vivide oscil- 

 lantia continentia; chlorophora ut in Penio axilia ^) e laminis ra- 

 diato-divergentibus, pyrenoides regnlariter seriatos vel irreguiariter 

 dispositos continentibus composita; membrana tenuis, firmula, hya- 

 lina vel in individuis emortuis pallide colorata. 



Multiplicatio ut in Penio et Mesokenio. Zygota glubosa, ova- 

 ta vel quadrangularia, levia; celiulx^ evacuata) leves vel longitu- 

 dinaliter striatffi, numquam granulatae. 



A. Cellula3 subcylhulracese, leniter incurvse, latere convexo (dorso) et 

 coucavo (ventre) subparallelis, apicibus haud vel tantum prope eos longe 

 attenuata;; zygota globosa vel quadrangularia. 



1. Closteriutn gracile Breb. List. Desm. p. 155, t. H, f. 45, Cooke 1953 

 Brit. Desm. p. 22, t. 13, f. 8, Wolle Desm. U. S. p. 30, t. 6, f. 4-5, 

 Hansg. Prodr. p. 178, Wittr. et Nordst. Alg. aq. dulc. exs. n. 89, 

 262 nec Cl. gracile Lundeli. — Cellulis oblongo-cylindraceis, 5-6-8 



p.. latis, diametro 20-30-ios longioribus, apices obtusos versus le- 

 niter attenuatis incurvisve; locellis apicalibus haud acute deflnitis ; 

 membrana levi, molli, pierumque hyalina; zygotis globosis, levi- 

 bus, 27:^20. 



Hab. in stagnis fossisque in Gallia (De-Brebisson), Hibernia 

 (Arciier), Suecia (Cleve), Belgio (De-Wildeman), Rossia (Artari), 

 Hungaria (Istvanffi), Norvegia (Nordstedt), Dania (Jacobsen), 

 Bohemia (Sciiroeter, Hansgirg), America boreali (Wolle), Nova 

 Zelandia (I^erggren sec. Nordstedt), — Specimina novozelandica 

 praibent cellulas 130-235:^6,5-7,5, apicibus 3,5 a. latas. A Clo- 

 slerio Lundellii Lagerh. {Closterium gracile Lund. nec Breb.) dif- 

 fert zygotis globosis levibus nec quadraticis angulisque acuieo 

 singulo instructis. 



2. Closterium Lundeilii Lagerh. Bidrag till Sveriges Algflora p. 53, 1954 

 Closteriu7n gracile Lund. Desm. Suec. p. 82, f, 5, f. 15, nec Breb. — 

 Habitu Closterio gracili Breb. simile; celiulis 4-6 a, latis, diame- 



1) In Closterio laterali Nordst. adsunt 5 chlorophora sublateralia! 



