Riccardia graeffei

Species description

Care, breeding and tankmates

Plant profile

Placement

Midground

It should be firmly attached to hardscape elements such as porous rocks or driftwood branches. It is ideal for the midground or foreground, where its intricate details can be closely observed. It must not be buried in the substrate, as this will lead to immediate rot.

Botanical form

epiphyte or epilith

This species forms dense, prostrate mats with a slightly more robust and broader thallus compared to Mini Pellia. The structure is deeply lobed and somewhat rigid, giving it a miniature, fern-like or coral-like appearance. Its rich, dark green coloration is highly appealing in aquascapes.

Growth

Slow

Its growth is characteristically slow and steady, taking several weeks to establish and spread. Under optimal conditions with CO2 supplementation, it forms thick, creeping mats. Patience is required, as it cannot be rushed with excessively high lighting or heavy fertilization.

Substrate

None

Riccardia graeffei is a slow-growing epiphytic liverwort that does not rely on a traditional substrate for survival. Lacking a true root system, it anchors itself to hardscape elements such as wood and stones using tiny hair-like structures called rhizoids. It draws all its essential nutrients and minerals straight from the water column across its green thallus. It should never be buried in soil or sand, but rather attached to decorations where it can securely latch on and slowly creep over the surfaces.

Column fertilization

Recommended

Column fertilization is the only effective way to feed this plant. A regular, light dosing of trace elements and potassium will keep it thriving. Be cautious with macronutrient dosing to avoid giving algae an advantage over this slow grower.

Root fertilization

None

Root fertilization is not applicable, as it lacks a root system and is grown exclusively as an epiphyte. The plant derives no benefit from nutrient-rich substrates. Ensure the water column has what the plant needs.

Trimming

Occasional

Careful trimming is necessary once the mat becomes too thick, which can cause the bottom layers to detach and float away. Thinning out the patches with fine aquascaping scissors promotes healthy, attached growth. Removed trimmings can easily be repurposed for new aquascaping projects.

Propagation

Cuttings

Propagation is simply a matter of dividing the existing thallus mass. Small fragments can be glued or tied onto new hardscape surfaces. Even tiny pieces have the potential to grow into full, healthy mats over time.

Sensitivity

Moderate

It is susceptible to suffocation by detritus or competitive algae if water flow is inadequate. It thrives best in slightly cooler water and may suffer if temperatures consistently exceed 26°C (79°F). Avoid using chemical algaecides, such as liquid carbon overdoses, which can melt the delicate tissues.

Layout role

Epiphyte, Nano

It is an excellent choice for detailing hardscape, creating a very natural, weathered look on rocks and wood. Its slightly larger structure compared to R. chamedryfolia provides a distinct textural variation. It is frequently used in nano tanks and intricate nature aquarium layouts.