Problems in classification and identification of Synuraceae (Chrysophyceae) |
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| Authors: | Jørgen Kristiansen |
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| Institution: | 1. Institute of Plant Anatomy and Cytology, University of Copenhagen, S?lvgade 83, DK-1307, Copenhagen K, Denmark
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| Abstract: | In the Synuraceae, the silica scales which cover the cell surface are of great taxonomic importance, although their delicate structure requires use of electron microscopy. Many species have been incompletely described by means of light microscopy, and there are serious difficulties in correlating them with species based on electron microscopy of the silica scales. The different types of variation in scale structure are described, and the variation range to be accepted within a species is discussed. However, as sexual reproduction is of rare occurrence in this family, the species concept must be highly arbitrary. It is reassuring then that many species based on scale ultrastructure also exhibit morphological and ecological characteristics. The advantages of scanning and transmission electron microscopy are emphasized for species identification and for detection of small forms with especially delicate scales. |
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