Introduction & Discovery

Cyathea loheri honours August Loher (1874 to 1930), a notable German-born plant collector who spent most of his adult life in the Philippines and assembled one of the most significant early collections of Philippine highland plants. Loher's explorations of the mountains of Luzon, Mindoro, and other Philippine islands in the late nineteenth and early twentieth centuries yielded thousands of specimens, many representing species new to science, that were distributed to major herbaria in Berlin, Kew, and Manila. Cyathea loheri, a tree fern of the Philippine montane forest named in his honour, belongs to the family Cyatheaceae and is listed under CITES Appendix II. The species is a medium-sized tree fern with a caudex reaching 3 to 7 metres, bearing a crown of bipinnate fronds in the filtered light of the moss-draped highland forest. It is a Philippine endemic, representing the rich but threatened fern diversity of an archipelago where more than 90 percent of original forest cover has been lost. The Philippine highlands, from the peaks of the Cordillera Central in northern Luzon to Mount Apo in Mindanao, shelter dozens of Cyathea species in various stages of taxonomic resolution, many of them poorly known in ecology and conservation status. For the collector and conservationist alike, C. loheri symbolises both the extraordinary botanical wealth of the Philippine mountains and the urgent need to protect it. The species is virtually unknown in cultivation outside the Philippines, appearing in only a handful of international botanical garden collections.

A beautiful, moderately large tree fern with an upright trunk to 10 m tall that holds a spreading crown of tripinnate fronds to about 2 m long with warty, dark brown to purple stalks covered in pale brown scales. Cyathea loheri is native to dryish cloud forests between 1400 and 1600 m in southeastern Taiwan and 600 and 2500 m in the Philippines and on Mt. Kinabalu on the Island of Borneo. It is a very rare species and hardly ever grown in cultivation. It is best suited to cultivation in warm temperate climates in USDA Zones 9 and 10.

Discovery & Naming

Cyathea loheri was named in honour of August Loher (1874 to 1930), a German plant collector who settled in the Philippines and assembled extensive botanical collections from the mountains of Luzon, Mindoro, and other islands during the period 1889 to 1920. Loher sent his specimens to European herbaria, particularly Berlin, where they were studied by leading pteridologists. His Philippine collections included numerous new species across many plant families and remain foundational references for the taxonomy of the Philippine flora. The species epithet loheri commemorates his contributions. The species was described from montane material collected during Loher's Philippine expeditions. Like many Philippine tree ferns, its precise taxonomic limits are still being refined as modern systematic work advances. Molecular phylogenetic placement within Cyathea sensu lato is supported by contemporary analyses. Cyathea loheri was named in honour of August Loher (1874 to 1930), a notable German plant collector who settled in the Philippines as a young man and dedicated over three decades to botanical exploration of the Philippine highlands. Loher arrived in the Philippines around 1889 and spent the following years traversing the mountains of Luzon, Mindoro, Palawan, and other islands, often in difficult and dangerous conditions, assembling one of the most extensive early collections of Philippine highland plants. His specimens, numbering in the thousands, were distributed to major European herbaria, particularly the Botanisches Museum in Berlin-Dahlem, where they were studied by leading pteridologists including Heinrich Christ and Georg Hieronymus. The species epithet loheri commemorates his pioneering contributions to the knowledge of Philippine fern diversity. Like many Philippine tree ferns, the precise taxonomic limits of C. loheri are still being refined as modern systematic work advances. Molecular phylogenetic placement within Cyathea sensu lato is supported by contemporary analyses.

Native Range & Distribution Map

Distribution map showing the native range of Cyathea loheri.

Biology & Frond Morphology

Cyathea loheri belongs to the genus Cyathea in the family Cyatheaceae, producing bipinnate to bipinnate-pinnatifid, 1.5 to 3 metres long, in a crown of 8 to 16 fronds. stipes are 40 to 80 centimetres long, dark brown, and clothed at the base with dark brown lanceolate scales. the rachis is stramineous to pale brown with scattered small scales. pinnae are alternate, lanceolate, 20 to 45 centimetres long, with 16 to 26 pairs per frond. pinnules are oblong, 1 to 3 centimetres long, with crenate to serrate margins. texture is herbaceous to subcoriaceous, mid-green to dark green above and paler beneath. sori are round, at vein forks, with thin indusia. fronds that unfurl from coiled fiddleheads (croziers). Like all ferns, it reproduces via spores borne on the underside of fertile fronds rather than flowers and seeds, and its life cycle alternates between a dominant sporophyte (the visible plant) and a small, short-lived gametophyte stage.

Reproduction & Propagation

Propagation of Cyathea loheri can be achieved through several methods:

• Spores: Collect ripe spores from the underside of fertile fronds, sow on sterilised peat or peat/perlite mix. Do not cover. Keep humid and in bright indirect light. Prothalli (gametophytes) typically develop in 4–12 weeks, and young sporophytes appear after a further 2–6 months.
• Division: Mature clumps with multiple crowns or creeping rhizomes can be divided in spring as new fronds emerge.
• Rhizome cuttings / offsets: Epiphytic genera (Davallia, Polypodium, Phlebodium) can be propagated from 5–10 cm rhizome segments with at least one frond and visible roots.

Cultivation & Substrate

Successful cultivation of Cyathea loheri depends on matching three conditions to its natural habitat: consistent moisture without waterlogging, a humus-rich yet well-drained substrate, and the correct light level for its frond type — whether dappled woodland shade, bright filtered light, or, for a handful of rock ferns, direct sun.

Common Mistakes to Avoid

Maintaining too high temperatures; the species is montane and suffers above 28 degrees Celsius. Insufficient humidity causes frond deterioration. Using hard water damages the acid-loving root system. Over-fertilising. Attempting outdoor cultivation in temperate or lowland tropical conditions is futile. Confusing with C. contaminans, which requires different (warmer, brighter) conditions.

Seasonal Considerations

Spring (March to May): resume feeding. Increase watering. Growth begins. Summer (June to August): peak growth. Shade and humidity critical. Water 2 to 3 times weekly, mist daily. Feed monthly. Autumn (September to November): growth slows. Reduce then cease feeding. Maintain watering. Winter (December to February): minimal growth. Maintain above 10 to 13 degrees Celsius. Water once or twice weekly. Supplement lighting.

Diseases & Pests

Common issues affecting Cyathea loheri in cultivation:

• Root/rhizome rot: Caused by waterlogged substrate, compacted soil, or overwatering in cool weather. Ensure the growing medium is well-aerated and never let pots sit in standing water for prolonged periods.
• Fungal leaf spot & Botrytis: Brown or grey blotches appear in stagnant, overly humid conditions. Improve air circulation, remove affected fronds, and avoid wetting foliage late in the day.
• Scale insects & mealybugs: The most common fern pests, hiding on stipes and frond undersides. Wipe off with a cotton swab dipped in diluted isopropyl alcohol, or treat with horticultural soap. Many chemical pesticides scorch fern fronds — always test on one frond first.
• Spider mites: Fine webbing and stippled fronds, common in dry indoor air. Raise humidity and rinse fronds regularly with tepid water.
• Frond browning (tip burn): Caused by dry air, direct hot sun, fluoridated or chlorinated tap water (especially in Nephrolepis, Calathea-loving filmy ferns), or soluble-salt build-up from fertiliser. Flush the pot with rainwater and reduce feeding.

Indoor Growing & Terrariums

Cyathea loheri can be grown indoors as a houseplant or terrarium subject when its humidity and light requirements are met.

Indoor Setup

• Light: Bright indirect light — an east- or north-facing window, or 30–60 cm under an LED grow light (10–12 hours/day). Most ferns scorch in direct midday sun.
• Humidity: 50–80%. Group plants, stand pots on a pebble-and-water tray, or run a humidifier; misting alone rarely raises ambient humidity enough.
• Temperature: 16–24°C (60–75°F) for most indoor species; avoid cold drafts and hot radiators.
• Substrate: Peat-free potting mix with added perlite and orchid bark for drainage; epiphytic genera (Platycerium, Davallia) grow best mounted on bark or in a bark-heavy orchid mix.
• Water: Keep consistently moist but never waterlogged. Let the top 1–2 cm of substrate dry slightly between waterings in winter.
• Air circulation: A gentle fan discourages fungal leaf spot without drying out the fronds.

Landscape & Garden Use

Cyathea loheri can be used in the garden wherever its hardiness and habitat preferences are matched. Ferns are classic choices for shaded borders, woodland gardens, stumperies, rockeries, stream-side plantings, and ground-cover under trees.

Landscape Tips

• Companions: Hostas, Astilbe, Heuchera, Tiarella, Epimedium, hellebores, snowdrops and other shade-tolerant perennials are classic partners.
• Soil preparation: Incorporate leaf mould or composted bark to improve moisture retention and mimic a forest floor.
• Mulching: A 3–5 cm mulch of chipped bark or leaf litter protects the rhizomes, conserves moisture, and slowly releases nutrients.
• Watering: Establish new plantings with regular deep watering during the first growing season; most hardy ferns need only occasional supplemental irrigation once established.

Conservation & Collector Notes

Not formally assessed by the IUCN. Listed under CITES Appendix II. The species faces severe conservation concern due to the massive loss of Philippine forest cover. More than 90 percent of the Philippines' original primary forest has been destroyed, and montane forests, though somewhat more intact, are increasingly threatened by slash-and-burn agriculture, illegal logging, mining, and infrastructure development. Protected areas including Mount Pulag National Park, Mount Apo Natural Park, and Mount Kitanglad Range Natural Park provide some habitat protection. Ex situ conservation is minimal. The Philippine Biodiversity Conservation Foundation and the National Museum of the Philippines have documented tree fern diversity on several Philippine peaks, but comprehensive population assessments are lacking. Cyathea loheri has not been formally assessed on the IUCN Red List, but it warrants significant conservation concern as a Philippine endemic species in a country that has lost more than 90 percent of its original primary forest cover. The species is listed under CITES Appendix II. Montane forests in the Philippines, while somewhat more intact than lowland forests due to their inaccessibility, face increasing threats from slash-and-burn agriculture, illegal logging, mining concessions, and infrastructure development. Climate change is projected to raise temperatures at montane elevations, potentially shifting suitable habitat upslope and reducing its overall extent. Protected areas including Mount Pulag National Park, Mount Apo Natural Park, Mount Kitanglad Range Natural Park, and Mount Hamiguitan Range Wildlife Sanctuary provide some degree of habitat protection. The Philippine Biodiversity Conservation Foundation and various university-based botanical research programmes have documented tree fern diversity on several peaks, but comprehensive population assessments remain lacking. Ex situ conservation is minimal and urgently needs expansion.

Collector Notes

Cyathea loheri is a compelling species for collectors focused on Philippine endemic plants, representing the rich but imperilled montane fern flora of the archipelago. The species is extremely rare in cultivation outside the Philippines, and acquisition requires contact with Philippine botanical institutions, particularly the Philippine National Museum herbarium, the University of the Philippines Los Banos herbarium, and Philippine botanical gardens. Fern society spore exchanges occasionally offer Philippine Cyathea, but C. loheri is among the rarest. The historical connection to August Loher adds biographical interest. Full provenance documentation is essential. CITES documentation required. No cultivars exist.

Ethnobotany & Cultural Significance

In the Philippines, tree ferns including Cyathea loheri have been used by indigenous highland communities for practical purposes. The Igorot and other Cordillera peoples of northern Luzon use tree fern caudices for garden fencing and as supports for terraced rice paddy walls. The caudex is sliced for orchid mounting boards, an important cottage industry. The starchy pith has been consumed as famine food. Fronds serve as temporary thatch. The Philippine name for tree ferns varies regionally; 'pakpako' and 'alo-ob' are among the terms used. August Loher, after whom the species is named, documented some of these uses during his extensive collecting expeditions in the late nineteenth and early twentieth centuries. In the Philippines, tree ferns including Cyathea loheri have been used by indigenous highland communities for a variety of practical purposes across many generations. The Igorot peoples of the Cordillera Central in northern Luzon use tree fern caudices for garden fencing, supports for terraced rice paddy walls, and posts for traditional houses. The caudex is sliced into slabs for orchid mounting boards, an important cottage industry in some Philippine provinces where epiphytic orchid cultivation is economically significant. The starchy pith has been consumed as a supplementary food during periods of crop failure, particularly in remote highland communities. Fronds serve as temporary thatch for trail shelters and drying platforms. The Philippine names for tree ferns vary regionally and linguistically; terms such as pakpako, alo-ob, and other local names reflect the linguistic diversity of the archipelago.

Frequently Asked Questions