Controls stomatal patterning. Mediates differentiation of stomatal lineage cells to pavement cells and stomatal development inhibition (PubMed:23748792). TMM (AC Q9SSD1) functions to dampen or block CLL1 signaling. Acts as growth-regulatory ligand for ERECTA family receptors. Promotes fruit growth and fertility (PubMed:22474391). Interacts with ERECTA. Expressed asymetically in the hypocotyl, on the side proximal to the folded cotyledons at germination. Detected in developing flowers, the chalazal region of ovules and near the root apex, but not in inflorescence stems. Expressed in cotyledons, flowers, adult leaves and fruits (PubMed:23748792). Belongs to the plant cysteine rich small secretory peptide family. Epidermal patterning factor subfamily.