Jeffro, regarding the Daily Mail article referred to in the opening (first) post of this topic thread, the title of the article is "Mushrooms on Mars? Scientist dubbed the 'Space Tiger King' claims to have found evidence of FUNGI on the Red Planet - but NASA says they're just rocks". As a result though that article is sensationalist it does does have a disclaimer in that "it says that NASA says they're just rocks". The article says the following regarding NASA's view.
"But scientists at NASA have poured cold water on their claims.
Andrew Good, a spokesman for the Jet Propulsion Laboratory, told leadstories: 'Needless to say, no, this is not evidence of fungi on Mars.
... 'The images that are being posted are from the Opportunity rover, which discovered mineral spherules that were nicknamed 'blueberries' based on their size and shape. Scientists didn't rely solely on visual information to identify them; they used instruments on the rover to measure chemical and mineral information within these spheurles, confirming they were in fact minerals that formed in the presence of water.
'The blueberries are one of the best-known discoveries of the Opportunity mission, something countless Mars scientists from around the world would be familiar with and have studied the data for.
... 'The authors ignore other data that easily disprove their claims; for example, many features claimed to be biological are known to typical martian rocks, sand, dust, and ice that change in appearance due to weather, lighting, or rover interactions. Other features superficially resemble fungi but actually are commonly observed, abiotic features in rocks that occur from geochemical changes or by erosion from wind.' "
The article also says the following.
"Wei, Armstrong and Joseph have been sifting through NASA images of Mars for years and have shared their many dubious 'discoveries' with the world on numerous occasions.
... Joseph has made headlines in the past when he sued NASA in 2014 demanding they examine a 'putative biological organism' which he says he saw in Opportunity rover images.
The alleged organism later turned out to be a rock.
... The researchers point to 'araneiforms', dark channels in the Martian soil, seen by Curiosity, as evidence of black fungi, mold, lichens, algae and other sulphur reducing species.
... NASA has previously stated that these massive araneiforms are the result of the thawing of seasonal carbon-dioxide ice."