Wollemia nobilis

Wollemia nobilis

The Wollemi Pine (Wollemia nobilis W.G.Jones, K.D.Hill & J.M.Allen, 1995) is a tree species belonging to the family Araucariaceae.

Systematics –
Domain Eukaryota,
Kingdom Plantae,
Subkingdom Tracheobionta,
Division Pinophyta,
Class Pinopsida,
Order Pinales,
Family Araucariaceae,
Genus Wollemia,
Species W. nobilis.

Etymology –
Wollemia nobilis W.G.Jones, K.D.Hill & J.M.Allen is an evergreen conifer of the family Araucariaceae, the sole representative of the genus Wollemia, one of the three extant genera of the family alongside Araucaria and Agathis. From a phylogenetic standpoint, Wollemia is particularly closely related to Agathis. The species was scientifically described in 1995, following its discovery in 1994 in New South Wales, Australia.
The genus name Wollemia derives from Wollemi National Park, the Australian area where the plant was discovered. The specific epithet nobilis, from the Latin nobilis, -e (“noble”), pays tribute to its discoverer, National Parks and Wildlife Service ranger David Noble, while also alluding to the exceptional nature of the plant.
The species is commonly known in English as Wollemi pine, although it is not a true pine, and by expressions such as living fossil and dinosaur tree, referring to its evolutionary antiquity and the presence of related fossil forms dating back millions of years.
Numerous common names are documented in different languages. In French it is called Arbre de Wollemi and Pin de Wollemi; in Finnish, Australianwollemia; in Croatian, Australski stribor; in Vietnamese, Cây thông Wollemi; in Latvian, Dižā volēmija; in Spanish, Pino Wollemi; in Italian, Pino di Wollemi; in Hungarian, Sárkányfenyő; and in Slovenian, Volemija. These names mainly reflect the international spread of the species as an ornamental and botanical plant following its discovery.
The discovery of the species in 1994 was an event of great botanical significance: a tree belonging to a genus long thought to have disappeared was found still living in a wild and difficult-to-access area of Australia.

Geographical Distribution and Habitat –
Wollemia nobilis is endemic to New South Wales, in southeastern Australia. Its natural range is extremely restricted and comprises a small number of populations located within Wollemi National Park, in the mountainous Blue Mountains region, northwest of Sydney.
Wild plants live in deep, humid, sheltered gorges characterized by steep sandstone walls and a particularly favorable microclimate. The natural habitat is associated with subtropical conditions and rocky, acidic, nutrient-poor soils covered by a layer of organic matter. The environment is generally very humid and protected from direct exposure to the most extreme weather events.
The natural distribution is so limited that the exact location of wild populations is kept confidential to reduce the risk of illegal collection, vandalism, and the introduction of pathogenic organisms.
Surveys conducted in 2020–2021 recorded 89 wild individuals, distributed among four closely spaced populations, of which 46 were mature. Research carried out through ground surveys, cliff access, drones, and helicopters also failed to identify any other significant populations.
The species is therefore one of the rarest conifers in the world and is classified by the IUCN as Critically Endangered (CR), corresponding to an extremely high risk of extinction in the wild.
Its survival is threatened primarily by the extremely small population size, the restricted range, difficulties with natural regeneration, and the presence of pathogens of the genus Phytophthora. Among these, Phytophthora cinnamomi is particularly dangerous; the spread of these organisms may be facilitated by the transport of contaminated soil on visitors’ footwear.
Another threat is posed by bushfires. During the devastating Australian bushfire season of 2019–2020, the wild population was seriously threatened, but a specific intervention by firefighters, including irrigation and the use of fire-retardant substances, helped protect it.
The extremely low genetic variability of the population constitutes another feature of particular scientific interest: genetic analyses have revealed exceptionally low levels of diversity, consistent with an ancient and prolonged demographic bottleneck.

Description –
Wollemia nobilis is an evergreen, monoecious, generally erect tree that can reach 25–40 m in height in the wild, with trunks that can exceed 1 m in diameter. It has a relatively narrow, columnar crown.
One of its most recognizable characteristics is its bark, initially reddish-brown and scaly, which becomes dark with age and develops a strongly tuberculate and spongy appearance. Because of its irregular surface, it has often been compared in appearance to chocolate breakfast cereal.
The plant has a particular ability to produce basal shoots: new stems can develop from the base, so that a single individual may appear as a group of trunks of different sizes. This characteristic also makes it difficult to distinguish between individual plants and groups of stems belonging to the same root system.
The lateral branches have an unusual structure: they generally produce only first-order branches and, after a few years, cease growing. A branch may complete its cycle by producing a cone or may undergo abscission; new branches can subsequently develop from dormant buds present on the trunk.
The leaves are simple, sessile, flat, and linear. Their morphology varies according to age and shoot type. On young branches they may be smaller and arranged differently from those on mature branches; on adult branches they generally reach 4–10 cm in length and are arranged in apparently opposite or subopposite rows due to the twisting of the leaf base. The upper surface is dark green, while the lower surface is generally lighter.
The species is monoecious, meaning that male and female cones occur on the same individual.
The male cones are terminal on the lateral branches, cylindrical, reddish or reddish-brown, generally several centimeters long and reaching approximately 11–15 cm. They contain numerous scales, each equipped with pollen sacs.
The female cones develop mainly in the upper part of the crown, on the lateral branches of adult specimens. They are ellipsoidal or nearly globose in shape, green when young and progressively turning brown at maturity, reaching approximately 8–12 cm in length. Maturation takes 18–20 months. At maturity, the cone disintegrates and releases the seeds.
The seeds are small, brown, and provided with a thin peripheral wing that facilitates their dispersal by wind.
Initial seedling growth is relatively slow, whereas adult specimens can have considerable longevity. Some wild trees have been estimated to be several hundred years old and, according to some assessments, the oldest may exceed a millennium.
The most fascinating characteristic of the species, however, lies in its combination of primitive and modern features. Its leaves, cones, and pollen show similarities to various groups of fossil Araucariaceae, helping to explain why Wollemia nobilis has been described as a “living fossil.” Its discovery has also made it possible to directly compare structures of a living conifer with those of numerous fossil forms from Australia, New Zealand, and Antarctica.

Cultivation –
Despite its rarity in the wild, Wollemia nobilis has proven relatively easy to cultivate. Propagation under controlled conditions is now an important component of the species’ conservation strategies.
A propagation program launched after its discovery made it possible to distribute specimens first to Australian botanical gardens and subsequently to botanical institutions and growers in numerous countries. Public sales began in Australia in 2006. The aim was twofold: to spread the species in cultivation and to reduce interest in the clandestine collection of material directly from wild populations.
The plant can be grown in the ground or in containers and adapts to both full sun and partial shade. Young specimens may benefit from some protection from the most intense solar radiation, whereas adult plants are generally more tolerant.
The soil should be very well drained, preferably acidic and rich in organic matter. It is important to maintain good water availability without causing waterlogging, which is particularly harmful to the root system.
The species shows considerable adaptability compared with what might be expected from its extremely restricted natural range. Cultivated specimens can tolerate climatic conditions different from those of the gorges where it occurs naturally; however, in cultivation it is advisable to avoid prolonged drought, waterlogging, strong winds, and severe, prolonged frosts.
Container cultivation is particularly suitable because it makes it easier to control drainage and substrate moisture. In addition, the relatively slow growth allows the plant to be kept in a container for many years.
Propagation can be carried out by seed, cuttings, and micropropagation techniques. Seeds should be placed superficially in an acidic, highly draining organic substrate, kept consistently moist but not waterlogged. Germination may take several weeks or, under less favorable conditions, longer.
Vegetative propagation is particularly important from a conservation standpoint because it makes it possible to obtain numerous individuals from a limited amount of starting material.
Pruning is generally not essential, but it can be carried out to control size or maintain a compact shape. It is advisable to use clean and disinfected tools, especially considering the species’ sensitivity to soil-borne pathogens.
Preventing the spread of Phytophthora is therefore essential for conservation: phytosanitary management of cultivated specimens and the rigorous procedures adopted at wild sites are an integral part of protecting the species.

Uses and Traditions –
No traditional food, medicinal, or craft uses of Wollemia nobilis prior to its scientific discovery have been documented. The plant remained unknown to Western botany until 1994, and its natural population is so small that any form of direct exploitation would be entirely inappropriate.
Its main contemporary use is therefore ornamental and botanical. The distinctive crown shape, characteristic bark, and symbolic value as a “living fossil” have made the species highly appreciated in botanical gardens, arboreta, and conifer collections.
Its cultivation has also taken on a specific conservation function. The distribution of nursery-grown specimens makes it possible to maintain a much larger ex situ population than that existing in the wild while simultaneously reducing the incentive for illegal collection at the natural site.
In Australia, Wollemia nobilis has also been promoted as a living Christmas tree: cultivated specimens in containers can be decorated during the Christmas season and subsequently maintained as ornamental plants. The Botanic Gardens of Sydney have also used a cultivated specimen as a Christmas tree.
The history of the species has also acquired strong symbolic value. The discovery of a genus thought to have disappeared and the subsequent revelation of its existence in a small Australian valley generated considerable interest both within the scientific community and among the general public. This gave rise to the popularity of the common names “living fossil” and “dinosaur tree,” which emphasize the conceptual link between the present-day plant and the ancient forests of the age of dinosaurs.
The controlled commercialization of the species also represents a particular case in the history of plant conservation: rather than merely prohibiting its cultivation, authorities and botanical institutions encouraged the propagation of specimens intended for the ornamental market, turning the distribution of cultivated plants into a complementary tool for protecting wild populations.

Preparation or Use –
Wollemia nobilis is not a plant intended for food or medicinal use, and no traditional preparations of its leaves, seeds, bark, or other parts are known. Its use mainly concerns ornamental cultivation, conservation, and botanical display.
As an ornamental plant, it can be grown in the ground, in large containers, in pots, or in planters. Container cultivation is particularly suitable for young specimens and makes it easier to control their growing conditions.
For home cultivation, it is essential to use an acidic, fertile, and above all well-drained substrate, keeping it moist while avoiding waterlogging. The plant can be placed outdoors in a bright or partially shaded position; during its first years, it is preferable to protect it from excessive sunlight and strong winds.
Propagation by seed requires viable seeds, placed superficially on the substrate and kept moist until germination. Since seed production and viability may be limited, cuttings and micropropagation are also of great importance in professional cultivation and conservation programs.
Cultivated specimens can be used as ornamental collector’s plants, distinctive trees for gardens and parks, or living Christmas trees.
In any case, considering the conservation status of the species and its extreme vulnerability to disease, cultivation should be understood primarily as a form of ex situ conservation and botanical appreciation, rather than as a source of material to be collected from the wild. The collection of specimens or propagative material from wild populations is incompatible with the conservation objectives of the species.

Guido Bissanti

Sources
Acta Plantarum – Flora delle Regioni italiane.
– Wikipedia, the free encyclopedia.
GBIF, the Global Biodiversity Information Facility.
Useful Tropical Plants Database.
– Conti F., Abbate G., Alessandrini A., Blasi C. (eds.), 2005. An annotated checklist of the Italian vascular flora, Palombi Editore.
– Pignatti S., 1982. Flora d’Italia, Edagricole, Bologna.
– Treben M., 2000. La Salute dalla Farmacia del Signore, Consigli ed esperienze con le erbe medicinali, Ennsthaler Editore.

Photo source:
– https://www.monaconatureencyclopedia.com/wollemia-nobilis/
– https://it.wikipedia.org/wiki/Wollemia_nobilis#/media/File:Wollemia_nobilis_(Kew_Gardens).JPG

Please note: Pharmaceutical applications and uses as food are indicated for informational purposes only and do not constitute medical advice; therefore, no liability is accepted for their use for therapeutic, cosmetic, or dietary purposes.