Heft 056: Biebel, P. und D.Mollenhauer (eds.): Symposium on Desmids and Other Zygnematales(Second International Desmid Symposium),Lake Itasca,Minnesota 21-25 Sept.1976.Proceedings.1986. 35 pls.13 tabs.17 figs.203 p.gr8vo.Paper bd.

Contents: Biebel, P.: Preface,Introduction, and Some Considerations on the Present Status ofZygnematales Research/ Meyer, Richard L.: The Conjugatophyceae fromItasca State Park, Minnesota, U.S.A./ Mollenhauer, Dieter: Concepts andStrategies for Research in Mesotaeniaceae/ Mollenhauer, Dieter:Contributions Towards a Revision of the Genus Spirotaenia(Mesotaeniaceae)/ Winter, P.A.: A Subcellular Study of Conjugation inStaurastrum gladiosum Turner/ Lorch, Dietrich W.: Desmids and HeavyMetals. I.Uptake of Lead by Cultures and Isolated Cell Walls of SelectedSpecies/ Coesel, P.F.M.: Structure and Dynamics of Desmid Communitiesin Hydrosere Vegetation in a Mesotrophic Quivering Bog/ Gerrath, J.F.:Some Observations on Polymorphism in Populations of Certain XanthidiumTaxa/ Handke, K.: First Report on Zygospores on Euastrum evolutum(Nordst.) West & West and Xanthidium brebissonii var. varians/ Handke,K.: Beobachtungen ueber die Variationsbreite einiger Desmidiaceen(Befunde an Freilandmaterialien)/ Williams, J.R. and P.Biebel: Conjugation and "Free" Zygospore Formation in a HomothallicCylindrocystis.