Microsorum pteropus - Tropica Potted Plant Plant in 5 cm pot. Microsorum pteropus is a water fern from Asia, 15-30 cm tall. To be grown on a root or stone, attached with fishing line until it has gained a hold. If planted in the bottom, do not cover the rhizome because it will rot. Easy to propagate by splitting the horizontal rhizome. A hardy plant that grows in all conditions. The black spots under the leaves are sporangia (reproductive organs), not signs of disease, as many believe. Plant info Type: Rhizomatous Origin: Asia Country or continent where a plant is the most common. Cultivars arise or are bred in cultivation. Growth rate: Slow Growth rate of the plant compared to other aquatic plants. Height: 15 - 30+ Average height (cm) of the plant after two months in the tank. Light demand: Low The average or medium light demand of an aquarium plant is 0,5 W/L. CO2 : Low A medium need in CO2 is 6-14 mg/L. A high demand in CO2 is approx. 15-25 mg/L.