Phlegmariurus (Huperzia) goebelii

Phlegmariurus (Huperzia) goebelii: habitat and distribution

Phlegmariurus goebelii, also known as Huperzia goebelii, is native from Thailand through the Malay Peninsula to Sumatra and Borneo. It grows on trees in wet tropical forest, where filtered light and moving humid air surround its hanging stems and small roots. Indoors, grow it on a mount or in a very open mix, keeping the roots moist without trapping them in standing water.

Phlegmariurus (Huperzia) goebelii: plant care

Light

Provide bright, diffuse light for the blue-green tassels, avoiding direct sun and hot lamps close to their tips. Light should reach all sides of the hanging stems so the leaves stay dense.

Water

Moisten the mount and small root area thoroughly before the moss and fine roots dry completely, preferably with rainwater or filtered water. Let surplus water drain and air return around the roots; never leave a potted plant standing in water.

Potting mix

Grow it mounted with a small layer of sphagnum moss or in an open basket of fine bark, fibrous material and a little moss. Dense houseplant compost stays wet for too long around roots that normally grow exposed on trees, so use a much looser mix.

Temperature and humidity

Warm, very humid conditions around 18–26 °C are helpful, but humidity must be paired with continuous gentle circulation. Keep the plant away from heating vents, cold draughts and sealed containers with dripping condensation.

Feeding and remounting

Use a complete fertiliser at very low concentration while new growth is appearing, then rinse periodically with rainwater or filtered water to prevent fertiliser salts from building up. Remount only when the material breaks down or the roots have clearly outgrown it.

Hanging growth and airflow

Hang the plant where its tassels can extend without resting on a shelf or wet wall. Handle the branching shoots carefully because damage is slow to replace, and inspect the crowded base for scale, mealybugs or decay.

Propagation

For home growers, divide only a mature plant that already has roots. Growing it from spores needs sterile equipment and is impractical at home.

Phlegmariurus (Huperzia) goebelii: issues and solutions

The base turns black and soft

A waterlogged mount or water held in the crown can rot the stem base. Remove the affected portion back to firm, healthy material, refresh decomposed mounting material and improve drainage and air movement before watering again.

Trailing tips become crisp

The mount may have dried too far, or hard-water and salts left by fertiliser may have accumulated on the fine foliage. Soak the root area thoroughly, use softer water where possible and keep feeding very dilute.

New stems are pale and thin

Thin new stems can follow light that is too dim or old mounting material. Increase filtered light gradually and, once new growth is visible, use a very weak balanced feed rather than a concentrated dose.

Exposed tips bleach or brown

Bright light is useful, but sudden sun or heat can mark the outermost shoots. Shift the plant behind a filter and introduce stronger light more slowly. The bleached areas will not recolour.

Scale or mites settle between the leaves

Inspect the close points where the leaves meet the stem for shells, stippling or fine webbing. Quarantine the plant, rinse gently or remove pests by hand, and test any treatment on a small section before covering the delicate shoots.

Keep Phlegmariurus (Huperzia) goebelii 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.

Phlegmariurus goebelii and Huperzia goebelii: why did the name change?

Phlegmariurus joins the older plant name Phlegmaria with Greek oura, meaning tail, for the tassel-like spore-bearing parts. Huperzia honours German botanist Johann Peter Huperz, while goebelii honours German botanist Karl Immanuel Eberhard Goebel.

Josef Holub established the genus Phlegmariurus in 1964 in Preslia, volume 36, pages 17 and 21.

Hermann Nessel first described it as Urostachys goebelii in 1934 in Repertorium Specierum Novarum Regni Vegetabilis, volume 36, page 188. Ashley R. Field and Peter Dundas Bostock later placed it in Phlegmariurus as Phlegmariurus goebelii in 2013 in PhytoKeys, volume 20, page 40.

Kew’s World Checklist treats Phlegmariurus goebelii as a synonym of Huperzia goebelii. Josef Holub placed the species in Huperzia as Huperzia goebelii in 1985 in Folia Geobot. Phytotax, volume 20, page 73.