2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/38891We discuss states in the meson spectrum which have explicit gluonic components. Glueballs (with no valence quarks) and hybrid mesons (with valence quarks) are both reviewed. We present in some detail lattice simulation results. ( to appear in proceedings of QCD-20 years, Aachen Workshop)15pp., (2 figs not enclosed), LTH 286High Energy Physics - LatticeHigh Energy Physics - Phenomenologytext