The last negrillo elms Nature · Laguna de Negrillos, El Páramo, León Image of Laguna de Negrillos, not of the place itself. The elm that gives the town its name, fifteen to twenty metres tall with toothed, asymmetrical leaves, has all but disappeared since the 1970s because of Dutch elm disease. A few large elms survive, along with root suckers known as olmedillas. Photo: Adolfobrigido (CC BY-SA 4.0) What to see and do in Laguna de Negrillos