Help for the identification of gilled mushrooms

Question 3: Presence of an umbo on cap

In this section, we must state whether the cap holds an umbo or a prominent protuberance in its centre. When in doubt, choose "I don't know".
Examples:

The umbo is clearly visible here, select then "yes" On the contrary, here no umbo and no protuberance can be seen, select therefore"no" The darker colour at the centre could make people think of an obtuse umbo, but there isn't any, select then "no"

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The umbo is clearly visible here, select then "yes"		On the contrary, here no umbo and no protuberance can be seen, select therefore"no"		The darker colour at the centre could make people think of an obtuse umbo, but there isn't any, select then "no"