The influence of micro-habitat on plant growth patterns. The GIS is configured to hold six 10 cm2 petri plates in two tiers, numbered sequentially: bottom tier plates are numbered 1 (imaging plate opposite the camera), 3 and 5; upper tier plates are numbered 2 (directly over plate 1), 4 and 6. Air is circulated by entering the base just below plate 3 and exiting just below plate 5 (A). Photographs taken of the flight plants when the plates were removed from the GIS for harvest on orbit are shown in from the upper tier (Plates 4, 2 and 6) and the lower tier (plate 1 and plate 5) (B). Note that not all plates were harvested on orbit, and that lower tier harvest plate images are limited.