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Extra resources for Goethe's Botany: The Metamorphosis of Plants (1790) and Tobler's Ode to Nature (1782)

Example text

The other member slightly back from where the hook cell approaches the main hypha, a septum forms across the main hypha where the hook cell has emerged and another septum across the hook cell at the same location. , next to the last), and the 19 Biology of Fungi nucleus that was in the hook cell passes into the penultimate cell. There are variations to the process that has just been described. For example, more than one clamp may form at the same place along a hypha, or branches may arise from the hook cell, but the basic events are as described.

Certain fungi may have components not mentioned above. For example, mannose is found in the cell walls of yeasts. Xylose and fucose are found in some basidiomycetes. Galactose and galactosamine may be found in the walls of some fungi. The structural features of the cell wall require studies with the electron microscope. These studies are useful for learning about the development of the cell wall. In some fungi, the em. studies have shown the cell wall to consist of 2 or 3 layers of unknown composition.

This was because the diploid nucleus is larger than the haploid somatic nucleus, whose chromosomes frequently approach in size the limits of resolution of the light microscope. As a consequence of this basic difficulty imposed by the small size of the somatic nucleus, it is not surprising that there are conflicting opinions in the literature about the mitotic process in fungal somatic cells. In some cases spindles have been reported; in other cases, spindles are absent. In the single species, Neuwspora crassa, an ascomycete, 3 methods for the division of the somatic nucleus have been reported - and it is conceivable that under certain conditions and locations more than one type of division may occur.

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Goethe's Botany: The Metamorphosis of Plants (1790) and Tobler's Ode to Nature (1782) by Johann Wolfgang von Goethe

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