Resurrection Fern
Pleopeltis polypodioides
The Resurrection Fern (Pleopeltis polypodioides) is a remarkable fern species in the family Polypodiaceae, famed for its extraordinary ability to survive extreme desiccation and seemingly "come back to life" when rehydrated.
Commonly found clinging to tree branches, rocks, and old walls across the southeastern United States and the Neotropics, this small epiphytic fern can lose up to 97% of its cellular water content, curling into a brown, brittle ball — only to unfurl into vibrant green fronds within hours of rainfall.
• One of the most desiccation-tolerant vascular plants known to science
• Can survive in a dried state for years and still recover upon rehydration
• The dramatic transformation from dead-looking husk to lush green plant inspired its evocative common name
• Also known as "Gray Polypody" or "Scaly Polypody"
Taxonomy
• In the United States, its range spans from Florida and Texas northward to Maryland, southern Ohio, and Oklahoma
• Found throughout Mexico, Central America, and into parts of South America
• Also occurs in Bermuda and the West Indies
The genus Pleopeltis belongs to the Polypodiaceae, one of the largest and most diverse fern families:
• Polypodiaceae contains approximately 60 genera and over 1,600 species
• The family is predominantly tropical, with many epiphytic members
• Molecular phylogenetic studies have reshaped the classification of this genus in recent decades, with many former Polypodium species transferred to Pleopeltis
The evolutionary lineage of polypod ferns dates back to the Cretaceous period, when the family began its major diversification alongside the rise of angiosperm-dominated forests.
Rhizome & Stipes:
• Rhizome is long-creeping, slender (~1–2 mm diameter), branching, and densely covered with lanceolate to ovate scales
• Scales are brown to reddish-brown, clathrate (lattice-like cell pattern), and persistent
• Stipes (leaf stalks) are short, typically 1–5 cm long, and winged or narrowly winged along much of their length
• Stipes are not articulate (not jointed at the point of attachment to the rhizome), distinguishing it from some related genera
Fronds:
• Simple, deeply pinnatifid (lobed but not fully divided into separate pinnae), oblong to lanceolate in outline
• Typically 5–25 cm long and 1.5–5 cm wide
• Texture is thick and somewhat leathery (coriaceous), an adaptation to periodic drought
• Upper surface is dark green and glabrous when hydrated; lower surface is densely covered with peltate (umbrella-shaped) scales
• When desiccated, fronds curl inward with the lower (abaxial) surface facing outward, protecting the scaly underside
• Upon rehydration, fronds unfurl and return to full green turgor within 2–4 hours
Sori:
• Sori are round, arranged in a single row on either side of the midvein of each lobe
• Lack indusia (protective covering)
• Sporangia are mixed with branched, hair-like paraphyses
• Spores are monolete (single linear scar), yellowish-brown
• Most commonly found in humid, subtropical to warm-temperate forests
• Frequently observed in swamp forests, maritime hammocks, and bottomland hardwoods
• Can also tolerate relatively dry, exposed microsites on tree bark and rock faces
• Often grows in association with mosses, lichens, and other epiphytic ferns
Desiccation Tolerance:
• The fern's most remarkable ecological adaptation is its extreme tolerance of desiccation
• Can lose up to 97% of its cellular water and enter a state of anhydrobiosis ("life without water")
• Accumulates protective sugars (trehalose and sucrose) and LEA (Late Embryogenesis Abundant) proteins that stabilize cell membranes and proteins during drying
• Antioxidant systems are upregulated during rehydration to repair oxidative damage
• This mechanism is fundamentally different from drought tolerance in most plants, which prevent water loss rather than surviving it
Reproduction:
• Reproduces via wind-dispersed spores, which require moist conditions to germinate
• Also spreads vegetatively through its creeping rhizome
• Spore germination leads to a small, heart-shaped prothallus that requires moisture for sexual reproduction
Light:
• Prefers bright indirect light to partial shade
• Can tolerate more direct light than many ferns, but prolonged intense sun may cause scorching
Humidity:
• Unlike most ferns, it does not require consistently high humidity
• Can tolerate dry indoor air, though it will spend more time in its curled, dormant state
• Occasional misting or soaking will trigger the dramatic unfurling display
Soil / Mounting:
• In nature, it grows on bark and rock without soil
• Best cultivated mounted on bark, cork, or tree fern plaques
• If potted, use a very well-draining epiphytic mix (orchid bark, perlite, and a small amount of sphagnum moss)
Watering:
• Allow to dry out between waterings — this is key to triggering the resurrection display
• Soak the entire mount or pot for 15–30 minutes when the fern is fully curled and dry
• It will unfurl and green up within a few hours
• Do not keep constantly moist, as this may encourage rot
Temperature:
• Hardy in USDA zones 6–10
• Tolerates brief cold snaps but is not frost-hardy in the long term
• Optimal growth range: 15–30°C
Propagation:
• Division of the creeping rhizome
• Spore sowing (slow and challenging)
Common Problems:
• Rot from overwatering or poor air circulation
• Scale insects and mealybugs on the rhizome
• Fronds failing to green up after rehydration may indicate the plant has been desiccated beyond recovery or has root/rhizome rot
Fun Fact
The Resurrection Fern's ability to "rise from the dead" has captivated people for centuries and has made it a subject of serious scientific research into desiccation tolerance. • In 2004, researchers at the University of California, Berkeley published a landmark study in the journal Plant Physiology detailing the molecular mechanisms behind the fern's desiccation tolerance, identifying key protective proteins and sugars • The fern's resurrection mechanism has inspired research into preserving vaccines and biological materials without refrigeration — a concept called "anhydrobiosis engineering" During the Apollo 14 space mission in 1971, the Resurrection Fern gained a unique place in history: • NASA studied desiccation-tolerant organisms including this fern to understand survival in extreme environments • Its ability to survive the vacuum-like conditions of extreme dehydration made it a model organism for astrobiology research The dramatic curling and uncurling is a passive physical process: • As the fern dries, differential shrinkage of tissues on the upper and lower surfaces causes the frond to curl inward, with the scaly underside facing out • This curling behavior actually protects the photosynthetic upper surface and reduces further water loss • Upon contact with water, the fronds absorb moisture rapidly through their surfaces and the cells rehydrate through capillary action and osmosis — no metabolic "decision" is required • The entire unfurling process can be observed in real time, typically completing within 2–4 hours In the southeastern United States, Resurrection Ferns growing on ancient Live Oaks draped with Spanish Moss create one of the most iconic images of Southern landscapes — a living tableau of epiphytic ecology that has inspired artists, poets, and naturalists for generations.
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