Selaginella erythropus, commonly known as Ruby Red Club Moss or Red Spikemoss, is a striking, ancient tropical plant prized for its intense two-toned foliage. Native to the rainforests of Central and South America, it features frilly, fern-like deep green leaves on top with a brilliant ruby-red or burgundy underside.

• Two-Toned Contrast: The red coloration is typically found on the stems and the undersides of the leaves, which reflects light in low-intensity environments to optimize photosynthesis.
• Growth Habit: It behaves as a low-growing, spreading groundcover that reaches roughly 6 inches in height but can trail outwards significantly over time.
• Prehistoric Roots: Despite its common name, it is a spikemoss (a lycophyte) rather than a true moss or fern, making it part of an ancient lineage of vascular plants.

• Light: Bright, indirect light to partial shade. Avoid direct afternoon sunlight, which easily burns the delicate, lacy foliage.
• Humidity: Extremely high humidity (70%+ is ideal). Because it dries out quickly, it thrives exceptionally well inside enclosed vivariums, terrariums, and paludariums.
• Watering: Keep the soil consistently moist but never waterlogged. It does not tolerate drying out completely, which quickly leads to crisping and browning.
• Substrate: A well-draining, moisture-retaining soil mix (such as a blend of peat moss, perlite, and orchid bark).