Title
Physiology-Soils PM Negatives 066-067
Creator
Date
1941
Format
Description
#66, leaf of 13-months-old seedling out parallel to surface to show longitudinal view of early stage of marginal spine.
#67, tip of mature leaf cut parallel to surface to show longitudinal view of mature stage of marginal spine.
Photographed by B. Krauss, May 2, 1941.
#67, tip of mature leaf cut parallel to surface to show longitudinal view of mature stage of marginal spine.
Photographed by B. Krauss, May 2, 1941.