I found this in my garden:enter image description here What type of mushroom is it? What is that ink-like substance? Does it affect in some way to the other plants?

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It's not clear from the comments whether or not you've found the answer to your question, but this is one of the Coprinopsis mushrooms or toadstools, commonly known as Inkcap. They start out bellshaped, then flatten out over time, and the spore print is black - as it deteriorates, it can exude black liquid, which once was used as ink. It's a saprophytic mushroom, meaning it lives on dead matter, and will not be harmful to other plants. Info here https://en.m.wikipedia.org/wiki/Coprinopsis_atramentaria

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    Close, but not exact. It's C. comatus, not atramentaria. (Sorry, sudden bout of know-it-all-ness ;-))
    – Stephie
    Jun 5, 2017 at 11:58
  • @Stephie - oh dear, well obviously the link was misleading - I only put in the link as general info on Coprinopsis or inkcaps in general rather than atramentaria in particular, so yea, you're right - most excrete inky black stuff over time
    – Bamboo
    Jun 5, 2017 at 14:36

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