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Advice please on what may have caused this large chunk to be taken from my specimen of Zamia fischeri?

Zamia fischeri - habit

Background

The plant was purchased about six months ago and I recently (three or four weeks ago) repotted it into the current, larger pot. It has settled in well and has begun to produce new leaves from its crown.

Problem

Only today did I notice the large chunk from its caudex.

It’s baffling me, as I am usually quite attentive and would expect to notice this when repotting the plant.

It appears to have “healed” over, so there is no raw or new damage.

Zamia fischeri - caudex - close up

Suggestions

Maybe:

  • as a younger plant, it was grown alongside a post or some other round object;
  • something has taken a big bite out of the side of the plant (we do have a local bandicoot with a large appetite);
  • The plant has some form of disease in the caudex.

Zamia fischeri - caudex - side

Research to Date

I have read these articles on the internet:

Any thoughts or advice greatly appreciated.

  • This looks like an old...wound? No problem that I can see. Could easily have been a rat? What soil have you used? Is this out of doors or indoors? Any other plants looked chewed on? Are the leaves chewed up that are closest in this picture? What fertilizer have you used? I'd get rid of all debris on top of the soil. If you are using garden soil in your potted plants it would be a good thing to repot all of your potted plants into potting soil and use some balanced fertilizer once or twice per year. As you find the time. Where do you live Andrew? – stormy Nov 27 '17 at 8:52
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Cycads are known for their growth in spurts. That is, growth of the crown slows to a crawl in dry or cool periods and then suddenly speeds up when resources are restored. This damage looks more like a vertical split as a result of a very dry spell followed by availability of water. A tight crown suddenly has more moisture than it can handle and splits vertically. All the roots remain attached in their places and leaf tissues are where they should be, except that a gap has appeared on one side of the crown to accommodate suddenly turgid cells.

In this article on Zamia there is a discussion of vertical splitting.

To distinguish a simple split from a chew we could examine how far the wound progresses into the crown; if it ends at a sharp angle then it is unlikely to be a chew unless the chewer has a very pointed snout. Note the base of one of the leaves shows such a sharp split.

The remaining issue is whether the growth habit of the cycad will fill in the gap. We know that less primitive plants such as maple trees will form callus tissue around obstructions but the same ability might not apply to a primitive plant such as a cycad. It would be interesting to see this plant as it is today.

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