Siderasis fuscata

Natural range and habitat of Siderasis fuscata

Siderasis fuscata is endemic to a very small part of Rio de Janeiro state in Brazil. Known locations include Tijuca Forest in Rio de Janeiro municipality and sites in Niterói.

It grows on shaded Atlantic Forest hillsides in shallow, rocky soil. Wild populations are fragmented, and the species is considered a conservation concern in Brazil.

Care for Siderasis fuscata

• Light: Give bright filtered light or gentle early-day sun. Strong midday sun can scorch the softly hairy leaves.
• Temperature and airflow: Keep temperatures around 18–26 °C. Avoid prolonged temperatures below 16 °C. Keep the plant warm with stable room temperatures and gentle airflow around the rosette.
• Humidity: Aim for 50–60% humidity.
• Water: Water once the surface of the mix begins to dry, then drain the pot fully. Keep some moisture in the root ball while new leaves are opening.
• Potting mix: Use an airy mix that drains freely while retaining some moisture around the fine roots.
• Feeding: Keep feeding light while growth is active.
• Repotting: Repot into a slightly larger pot when roots fill the container. If the mix has broken down, replace it with fresh airy mix.
• Propagation: Separate new shoots from the base once they have formed their own roots.

Common problems with Siderasis fuscata

• Leaf edges turn dry and brown: The root ball may have dried too far or the light may be too strong. Check how moist the mix is and place the plant in bright filtered light if the damage is strongest on the window-facing side.
• The crown or roots become soft and dark: Persistent wetness can lead to rot. Remove affected tissue back to firm healthy growth with a clean tool, discard the rotted material and repot healthy growth into fresh, airy potting mix.
• New leaves become smaller and the rosette opens out: Light is likely too low. Move the plant gradually closer to a bright window.
• Fine webbing, pale speckles or distorted new leaves appear: Mites or other sap-feeding pests may be present. Isolate the plant, inspect the hairy leaf undersides carefully and use a product labelled for the pest and indoor ornamental plants, repeating only at the label interval.

Keep Siderasis fuscata away from children and pets

• Keep this plant away from children, cats and dogs.
• Its effects after chewing or swallowing are unclear, and plant material can still cause an upset stomach.
• Contact a veterinarian or medical professional if symptoms develop or do not settle.

What does Siderasis fuscata mean, and who first published it?

Siderasis is formed from Greek sideros, iron, referring to the rusty or iron-coloured hairs. Fuscata means darkened or dusky, again pointing to the brown covering.

Constantine Samuel Rafinesque established the genus Siderasis in 1837 in Flora Telluriana, volume 3, page 67.

George Loddiges first described it as Tradescantia fuscata in 1820 in The Botanical Cabinet, volume 4, plate 374. Harold Emery Moore later placed it in Siderasis as Siderasis fuscata in 1956 in Baileya, volume 4, page 28.