Xanthosoma Lindenii ‘Magnificum’ (Caladium Lindenii) are a part of the Araceae family that is native to Columbia. They can be identified by their large, green, arrowhead shaped leaves with prominent white/cream coloured veins.
You should water your Caladium Lindenii regularly to help keep soil moist but be sure to not overwater. When watering, be sure to water thoroughly allowing water to drain completely. Aside from solely relying on the watering frequency to tell when your plant is thirsty, a tell tale sign that your plant needs water is drooping leaves.
In optimal conditions, your Caladium Lindenii should be fertilized weekly during the growth period because this will assist in keeping your plant alive as well as promote healthy growth. You can use a diluted liquid fertilizer or sprinkle a solid fertilizer on top of the soil.
Prune the entire leaf off via the petiole and investigate the rest of the plant for a potential spread of the problem.