Conspicuous fungus chlamydospores in the Rhynie chert
deutsche Version

Fungus formations called chlamydospores are well known and not rare in the Rhynie chert but some are peculiar and worth being considered more closely, as, for example, the big one in Rhynie Chert News 19 or 84, or the small ones in Rhynie Chert News 115. They are nearly always spherical, hence two ellipsoids seen near each other inside a hollow plant is a very rare view. Nothing similar has been seen among thousands of plant sections.

Fig.1: Fungus chlamydospores of uncommon ellipsoidal shape within the hollow shoot of an early land plant, most probably Aglaophyton, in the Rhynie chert. Image width 2mm.

Obviously, fungus hyphae are much less persistent than chlamydospores so that often only the latter are seen as fossils while nothing is left of the hyphae. In addition to its big size, this "egg" is conspicuous for the silica spherulites inside. There are no spherulites elsewhere, hence silicification conditions must have been distinctly different within and without. This indicates the presence of a barrier at the surface which kept the debris from the decayed plant tissue out but let the silica in.

In view of the fact that there are several fungus species in the Rhynie chert,
a statement from [1] is apparently still valid: The several different resting spores corresponding to the several fungus species "cannot yet be assigned to a particular clade with certainty, as important parts of their life cycles have not yet been discovered".
Sample: Rh6/68 (0.76kg)
Part 2, found in

H.-J. Weiss      2022  (Easter)

[1]  T.N. Taylor, E.L. Taylor, M. Krings: Paleobotany, Elsevier 2009, 76.

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