Acts primarily as positive regulator of inflorescence growth. Endodermal expression is sufficient for proper inflorescence architecture (PubMed:22474391). Redundantly involved with EPFL4 in procambial development regulation. Acts also as tissue-specific regulator of epidermal pattern. Controls stomatal patterning by repressing stomatal production. TMM (AC Q9SSD1) functions to dampen or block CHAL signaling. Not processed by SDD1 (AC O64495). Acts as growth-regulatory ligand for ERECTA family receptors. Interacts with ERECTA. Expressed in the internal layers of the root, hypocotyl and stems, and in the midrib of developing rosette leaves. Detected in a ring of cells surrounding the vascular elements. Expressed in developing stems soon after bolting, in inflorescence stems, near the root apex and in the chalazal region of ovules. Not found in cotyledons or in stomatal precursors or stomata. No visible phenotype in wild-type background, but restores stomata to hypocotyls in a tmm background. Chal and cll2 double mutants are defective in growth, with a short stature, shortened pedicells and compact inflorescence. Belongs to the plant cysteine rich small secretory peptide family. Epidermal patterning factor subfamily.