Can you guess what these are?

Found on the ground in Prospect Park. Answer tomorrow

ANSWER :

• Peter Dorosh OK here's the answer : seed husks of the American Chestnut.. Yes i know " what about the blight?" the species ( over 45 feet tall now ,three in that spot I picked up the seed husks, is modified genetically with Chinese chestnut to develops the immunit...See More
  

  
  

  
  

  

  
  

  A New Generation of American Chestnut Trees May Redefine America's Forests

  Before an exotic fungus nearly wiped them out in the...

  SCIENTIFICAMERICAN.COM|BY FERRIS JABR

  10 hrs · Like · Remove Preview
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  Peter Dorosh Oh,one more thing. local environmentalist Bart Chezar who planted those trees given him as tiny saplings from the American Chestnut foundation, successfully over the winter germinated 6 chestnut s from this spot trees , and being the first germination of this species naturally in Brooklyn in over a century according to Bart.

More about the restoration attempt http://www.scientificamerican.com/article/chestnut-forest-a-new-generation-of-american-chestnut-trees-may-redefine-americas-forests/