Here is the Splash Cup Bird's Nest Fungus, Cyathus striatus. This is a Common Bird's Nest Fungus that forms in rotting wood. This is the only fungus/mushroom that has anything close to seeds called peridioles "Eggs". They are easy to grow and are great for moss gardens, terrariums and vivariums. Just add some decomposing wood chips or hardwood mulch and sprinkle the peridioles on the wet surface an in a few months they will pop up!  PLEASE NOTE: As far as we know they are NOT edible.
 
"This species exists as a network of fungal cells (mycelium) within rotting wood. When it's ready to reproduce, small knoblike structures develop, each covered by a membrane that opens at maturity, revealing the cuplike shape beneath. Spores are contained in the egglike spore sacs in the "nest." When raindrops hit the sacs, they spring from the cups and adhere to surfaces three or four feet away. When the spores mature, they are released, falling to the ground to begin new growth."