English: Types of Stele in Vascular Plants: Fig. 3.—Diarch stele of root of a Fern. Fig. 4.—Haplostele of stem of young Fern. Fig. 5.—Amphiphloic haplostele of stem of young Fern. Fig. 6.—Solenostele of stem of Fern showing detachment of leaf-trace and leaf-gap. Fig. 7.—Dictyostele of Fern. Fig. 8.—Tricyclic solenostele of Matonia. Fig. 9.—Tricyclic dictyostele of Danæa. Fig. 10.—Diarch haplostele of Selaginella. Fig. 11.—Tristelic stem of Selaginella. Fig. 12.—Modified haplostele of Lycopodium. Fig. 13.—Typical siphonostele of dicotyledon. Fig. 14.—Stele of monocotyledon. Fig. 15.—Polyarch root of Veratrum (a monocotyledon). Explanation of Lettering: st. stele; mst. meristele; l.t. leaf-trace; l.g. leaf-gap; cor. cortex; p.t. peristelar tissue; p.l. peristelar lacuna; end. endodermis; p.c. passage cell; per. pericycle; ph. phloem; mes. mesocycle, x. xylem; px. protoxylem; mx. metaxylem; p. pith; scl. p. sclerised pith; c. cambium; p.m.r. primary, medullary, ray.