Abaxial view of Abies nordmanniana seeds. A - seed with integument (wing broken off), a "pure seed" according to PSD 51. B - naked seed. C - undamaged integument from which seed B was removed.
Figure 5. Abaxial view of Abies nordmanniana seeds. A - seed with integument (wing broken off), a "pure seed" according to PSD 51. B - naked seed. C - undamaged integument from which seed B was removed.