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Scientists Believe These Photos Show Mushrooms on Mars—and Proof of Life
(www.popularmechanics.com)
c/space Rules
One should take this with a grain of salt. First of all according to the article the authors of the paper themselves admit that they do not have conclusive evidence that the observed structures are actually mushrooms. And if you go through the paper everything you see just looks like pebbles.
And something else to consider are some of the other papers of the main author that suggest at least to me that they probably are not an expert in this field: