Symposium on Desmids and Other Zygnematales(Second International Desmid Symposium),Lake Itasca, Minnesota 21-25 Sept.1976.Proceedings.1986.(Nova Hedwigia,Beih.56). 35 pls.13 tabs.17 figs.203 p.gr8vo.Paper bd.

Contents: Biebel, B.: Preface,Introduction, and Some Considerations on the Present Status of Zygnematales Research/ Meyer, Richard L.: The Conjugatophyceae from Itasca State Park, Minnesota, U.S.A./ Mollenhauer, Dieter: Concepts and Strategies for Research in Mesotaeniaceae/ Mollenhauer, Dieter:Contributions Towards a Revision of the Genus Spirotaenia (Mesotaeniaceae)/ Winter, P.A.: A Subcellular Study of Conjugation in Staurastrum gladiosum Turner/ Lorch, Dietrich W.: Desmids and Heavy Metals. I. Uptake of Lead by Cultures and Isolated Cell Walls ofSelected Species/ Coesel, P.F.M.: Structure and Dynamics of Desmid Communities in Hydrosere Vegetation in a Mesotrophic Quivering Bog/Gerrath, J.F.: Some Observations on Polymorphism in Populations o fCertain Xanthidium Taxa/ Handke, K.: First Report on Zygospores of 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.