Marsilea crenata

Marsilea crenata is a small aquatic fern native to Southeast Asia that produces distinctive four-lobed fronds on short, creeping stems. Unlike most carpet plants it is genuinely low-light tolerant, making it one of the most accessible foreground options for low-tech planted tanks. Under higher light the fronds remain compact and tightly spaced; in low light they extend on longer petioles. The clover-like appearance offers a refreshing visual alternative to grass or fine-leaved carpet plants.