Fig. 1.

Morphological development in Abies koreana and Picea jezoensis seed cones. (A) A. koreana cones around bud break but before pollination; bract scales are the only visible structures. (B) P. jezoensis cones following bud break, with both bract scales and ovuliferous scales visible. (C) A. koreana cones at pollination, showing gaps between bract scales where pollen can enter the cone. (D) P. jezoensis cone at pollination; red structures are ovuliferous scales and the much smaller bract scales are no longer visible. (E) A. koreana after pollination; ovuliferous scales have expanded to fill spaces between bracts, which are now visible only as thin pointed structures. (F) P. jezoensis cone following pollination; growth of the ovuliferous scale bases has closed the gaps between them, while the entire cone has also shifted position.