Platycerium

Platycerium sporophytes (adult plants) have tufted roots, growing from a short rhizome, and bear two types of fronds - basal and fertile fronds. Basal fronds are sterile, shield- or kidney-shaped, and laminate against the tree, to protect the fern's roots from damage and desiccation. In some Platycerium species, the top margin of these fronds will grow into an open crown of lobes; catching rainwater, falling forest litter, bird/animal droppings, and even the occasional fallen baby bird or deceased animal, these plants build up their own “compost” system of nutrition over many years.

Fertile fronds bear spores on their undersurface, are dichotomous or antler-shaped, and jut out or hang from the rhizome. The spores are born in sporangia, clustered in large sori that are usually positioned on the lobes, or at the sinus between frond lobes.

Some species of Platycerium are solitary, having only one rhizome. Other species form colonies when their rhizomes branch, or when new rhizomes are formed from root tips. If the conditions are right, the spores will germinate naturally, on surrounding trees. Platycerium gametophytes are a small, heart-shaped thallus.

Platycerium have diverged into four natural groups. Several Platycerium are strongly adapted to xeric conditions, with a naturally drought-tolerant metabolism method having been reported for P. veitchii.[2]

The species Platycerium bifurcatum and Platycerium superbum are commonly cultivated as ornamental plants. These oddly shaped ferns grow on trees and rocks and can be found in gardens, especially tropical gardens.

Staghorns can be propagated by spores produced on the underside of the fertile fronds. Colonial Platycerium can also be vegetatively propagated by carefully dividing large healthy ones into smaller, separate plants. These new plants can then be attached to board mounts or be strapped to trees until they take to the tree themselves.

A mature staghorn can grow more than 1 metre (3.3 ft) wide.

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  Platycerium superbum at the Royal Botanic Gardens Sydney, Australia
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  Platycerium bifurcatum from the Mendut Temple, Indonesia
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  Platycerium coronarium from Pahang, Malaysia
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  Platycerium grande from Bukidnon, Philippines
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  Platycerium elephantotis at Kaisaniemi Botanical Garden, Finland

• Holtum, Joseph A.M.; Klaus Winter (1999-01-01). "Degrees of crassulacean acid metabolism in tropical epiphytic and lithophytic ferns". Functional Plant Biology. 26 (8): 749–757. doi:10.1071/PP99001.

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