Catillaria fungoides Care

This crustose lichen prefers cool, lightly shaded sites rather than strong, direct sun.

• Provide bright dappled light or light open shade, such as on the north or east side of rocks or bark, with no more than 1–2 hours of weak morning sun.
• Avoid intense midday and afternoon sun, which can overheat the thallus and cause bleaching or drying damage on exposed surfaces.
• In summer, slight shading from nearby vegetation helps maintain moisture, while in winter, low-angled light is usually sufficient for Catillaria fungoides.

This lichen absorbs moisture from rain, fog, and surface dampness instead of root-based watering.

• Allow the substrate to dry between natural wetting events; in cultivation, lightly mist only when the surface looks completely dry, not on a fixed schedule.
• Ensure very sharp drainage using a mineral-rich, gritty base so water does not pool around the thalli and cause softening, algal overgrowth, or decay.
• Signs of excess moisture include slimy texture or green film, while prolonged crispness, shrinking, and failure to rehydrate after misting suggest chronic drying stress.

This species prefers cool to mild conditions and does poorly in prolonged heat or hard frost.

• Aim for 45–65°F (7–18°C) for steady growth, with short periods up to about 70°F (21°C) tolerated if humidity stays moderate to high.
• Protect from severe cold; brief dips to around 25°F (−4°C) may be tolerated on sheltered substrates, but repeated freeze–thaw cycles with ice formation can damage tissues.
• Avoid hot, exposed sites above 80°F (27°C), where combined heat and dryness can cause desiccation; some afternoon shade and airflow reduce thermal stress in warmer seasons.

This crustose lichen tolerates a wide humidity range but grows best in consistently moist air.

• Aim for 60–90% humidity, avoiding prolonged levels below 40% that dry the thallus surface.
• It endures brief dry spells but repeated drying causes paling, brittleness, and poor expansion after wetting.
• Increase local humidity by misting nearby surfaces, using damp inert substrates, or placing culture in a ventilated, covered container.

This saxicolous lichen does not use traditional soil but can be cultured on carefully prepared inert or near-inert substrates.

• Use a firm, mineral-based medium such as weathered rock pieces, sand-rich mix, or fired clay granules with minimal organic matter.
• Ensure rapid drainage so water runs off within seconds, leaving the surface moist but not waterlogged or muddy.
• Maintain slightly acidic conditions around pH 5.0–6.5 if using any supporting mix, avoiding lime-rich, strongly alkaline materials.
• Improve aeration by using coarse particles (2–5 mm) and keeping organic components under 10% to prevent compaction and anaerobic pockets.

This lichen can be maintained in shallow containers or trays mainly for observation and controlled culture.

• Choose broad, shallow trays that allow horizontal spread of the substrate while keeping the lichen surface close to ambient light and airflow.
• Use rigid, stable containers that do not flex, so the mineral substrate and lichen crust remain undisturbed during handling.
• Select containers with very free drainage or sloped bases so rinse water and rain cannot pool around the substrate surface.

This lichenized fungus typically grows on nutrient-poor bark or rock and does not need supplemental feeding in cultivation.

As a crustose lichen, this species does not benefit from structured pruning and should generally be left undisturbed.

In cultivation, this species is best managed by relocating its substrate rather than traditional repotting.

• Transplant only when necessary, for example if the bark or rock substrate is deteriorating or being removed.
• Carry the supporting bark or stone intact, disturbing the Catillaria fungoides thallus as little as possible.
• Move during mild, stable weather to reduce stress from sudden changes in light and humidity.
• Avoid washing, scraping, or handling the lichen directly to keep the symbiotic structure intact.

Deliberate propagation of this crustose lichen is slow, technically demanding, and rarely attempted outside research settings.

This species is generally cold hardy in its natural range and needs no special winter care in outdoor culture.