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Showing results for tags 'mycorrhizae'.
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The Rhynie Chert preserves one of the oldest terrestrial ecosystems, which is a hot spring environment. It's Lower Devonian, and the oldest know harvestman was also found there. These are some photographs of my thin sections from this environment. This first thin section is one of my favourites, it has several Aglaophyton major plants that contain fungal cysts of Palaeomyces gordoni, containing spores. These are more Aglaophyton major cross sections. In this and the one above, there are a few vascular bundles, these consist of thin-walled protoxylem cells, surrounded by thicker metaxylem cells, which is then surrounded by the phloem. In the cortex of some of these is the mycorrhizal fungi Glomites rhyniensis. Their hyphae look like a darker-coloured ring. These both are Aglaophyton major. This one has Aglaophyton major, as well as Retusotriletes spores and some more Palaeomyces gordoni cysts without spores. This section contains a few Retusotriletes spores. This has the plant Horneophyton lignieri in it, which had a rhizoids instead of roots. In the upper left of this one is an arthropod coprolite consisting mostly of spores. Lastly, this is a piece of the Rhynie Chert containing Aglaophyton major.
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