Buckeyes and Chestnuts

For the longest time I have been confusing buckeyes and chestnuts, but not anymore!  Chestnuts are the ones that come in prickly outer cases;  buckeyes come in smooth, freckled cases.  This year's crop of both these nuts is pitiful and shrunken.  I found the large, glossy buckeyes on the left last year.  I found the center row of chestnuts yesterday, but I found only a few fully-formed big ones.  Most were undeveloped, like the little ones on the right.  Poor bears and squirrels this year of the dry summer.

Isn't the odd little design on the bottom of the chestnut  amazing?  It is on all of the fully-formed ones.