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Regrettably, JPL's own press release doesn't seem to include that info.
https://www.jpl.nasa.gov/news/nasas-curiosity-rover-sees-martian-spiderwebs-up-close/There are many links to this news online, but they all seem to rehash the JPL press release.
They do identify the ridges as being 2-3 meters tall, in some articles. I guess the nodules are smaller than that. Apparently, nodules have been found previously on Mars so they're "old news", thus less deserving of details.
PS: "Truffle" was not the thing that first leapt to mind.
