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Seasonal variations in the fine structure ofHypogymnia physodes (lichenizedAscomycetes) and itsTrebouxia photobiont

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Abstract

The lichenized ascomyceteHypogymnia physodes was collected every second month during a one year period at the same site in a wood near the city of Zürich and investigated with light and electron microscopy techniques. Temperature and relative humidity were measured at the collecting site. Seasonal variations in the germination rate of soredia, in photobiont cell size and cell number, in type and amounts of storage products, and in the density of intramembranous particles of the plasma membrane of theTrebouxia photobiont were observed. Highest germination rates and intense aplanospore formation were observed in January, highest particle densities in both external and internal fracture faces of the plasma membrane in March. Lipids and starch were most abundant in spring to early summer. In summer and autumn numerous photobiont cells died off.

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  1. Institut für Pflanzenbiologie, Universität Zürich, Zollikerstrasse 107, CH-8008, Zürich, Switzerland

    Elisabeth Fiechter & Rosmarie Honegger

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  1. Elisabeth Fiechter
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  2. Rosmarie Honegger
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This study is dedicated to Prof. DrElisabeth Tschermak-Woess on the occasion of her 70th birthday.

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Fiechter, E., Honegger, R. Seasonal variations in the fine structure ofHypogymnia physodes (lichenizedAscomycetes) and itsTrebouxia photobiont. Pl Syst Evol 158, 249–263 (1988). https://doi.org/10.1007/BF00936349

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