Figure 2

Representative stomatal complexes and patterns from different species. (A) Scanning electron micrograph (SEM) of Silurian fossil stoma displaying common morphology. Scale bar, 20 μm [3]. (B) SEM of moss Bryum capillare sporangium with stomata visible on the lower half. Scale bar, 600 μm [2]. (C) SEM of moss Bryum capillare sporangium stoma sunken below epidermal cells. Scale bar, 50 μm [2]. (D) SEM of fern Thelypteris ovata var. lindheimeri (sporophyte) leaf with stomata separated by pavement cells. Scale bar, 10 μm; s, stomata [6]. (E) Left panel, field emission SEM of Pinus koraiensis (gymnosperm) stomata arranged in rows on needle surface; granular material is surface wax. Scale bar, 10 μm. Upper right, dewaxed stomata. Scale bar, 10 μm. Lower right, dewaxed guard cells (arrows) within an epistomatal chamber. Scale bar, 2 μm [7]. (F) SEM of dicot Arabidopsis thaliana stomatal pattern in the sepal. (G) SEM of monocot Poa annua stoma, with subsidiary cells (sc) flanking the narrow guard cells. Scale bar, 10 μm [8]