Studies by Oeggl of a tiny sample of food residue from ötzi's colon have revealed the presence of the pollen of a small tree called hop hornbeam. 奥格研究奥兹大肠取出的微量食物残渣标本,找到了一种矮树(hophornbeam)的花粉。
Ostrya is a genus of eight to 10 small deciduous trees belonging to the birch family Betulaceae. Its common name is hophornbeam in American English and hop-hornbeam in British English. It may also be called ironwood, a name shared with a number of other plants.