What are these, found in Greece, South Euboean Gulf and Petalioi Gulf?

https://preview.redd.it/7cxy63ormv2h1.png?width=1148&format=png&auto=webp&s=88731214857e7e39e74e90bb1e912f8c66614c7a

https://preview.redd.it/yveypuhumv2h1.png?width=1148&format=png&auto=webp&s=771f58b3c197144f0c7356990e807c9c430fc3ba

Two questions from me:
1. These balls found on Marathon's beach (Petalioi Gulf), what weed is it made of?
2. Mushrooms on stone, found in Oropos (South Euboean Gulf) - name of these shrooms?
TIA

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