Ecology

Associations

In Great Britain and/or Ireland:
Foodplant / saprobe
fruitbody of Auricularia auricula-judae is saprobic on wood of Platanus

Foodplant / sap sucker
Corythucha ciliata sucks sap of Platanus

Foodplant / saprobe
bracket of Daedaleopsis confragosa is saprobic on dead wood of Platanus
Other: minor host/prey

Foodplant / saprobe
subepidermal conidioma of Dichomera coelomycetous anamorph of Dichomera mutabilis is saprobic on dead twig of Platanus
Remarks: season: 2-3

Foodplant / saprobe
fruitbody of Exidia nucleata is saprobic on dead, fallen, usually decorticate wood of Platanus
Other: minor host/prey

Foodplant / saprobe
very small, subepidermal, hardly lifting the bark stroma of Fusicoccum coelomycetous anamorph of Fusicoccum hapalocystis is saprobic on dead branch of Platanus

Foodplant / saprobe
immersed, grouped perithecium of Hapalocystis berkeleyi is saprobic on dead twig of Platanus

Foodplant / saprobe
fruitbody of Inonotus hispidus is saprobic on dead trunk of Platanus

Foodplant / gall
fruitbody of Inonotus obliquus causes gall of live trunk of Platanus
Remarks: Other: uncertain
Other: unusual host/prey

Foodplant / saprobe
fruitbody of Meripilus giganteus is saprobic on dead trunk (large) of Platanus

Foodplant / parasite
fruitbody of Perenniporia fraxinea parasitises live trunk (base) of Platanus
Other: minor host/prey

Foodplant / saprobe
fruitbody of Pholiota squarrosa is saprobic on relatively freshly cut, white rotted stump of Platanus

Foodplant / saprobe
uniformly distributed, immersed, then erumpent pycnidium of Phomopsis coelomycetous anamorph of Phomopsis radula is saprobic on dead stem (upper part)twig of Platanus
Remarks: season: 1-2

Foodplant / saprobe
fruitbody of Rigidoporus ulmarius is saprobic on dead, white-rotted stump (large) of Platanus

Foodplant / saprobe
subepidermal Microdipodiopsis dematiaceous anamorph of Splanchnonema platani is saprobic on dead twig of Platanus
Remarks: season: 1-12

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
Specimen Records:306
Specimens with Sequences:308
Specimens with Barcodes:28
Species:15
Species With Barcodes:14
Public Records:295
Public Species:14
Public BINs:0
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Wikipedia

Platanus

For the main-belt asteroid, see 9309 Platanus.
"Planetree" redirects here. For the nonprofit organization, see Planetree Alliance.
"plane tree" redirects here. For mathematical trees with a planar embedding, see ordered tree.

Platanus /ˈplætənəs/[1] is a genus comprising a small number of tree species native to the Northern Hemisphere. They are the sole living members of the family Platanaceae.

All members of Platanus are tall, reaching 30–50 m (98–164 ft) in height. All except for P. kerrii are deciduous, and most are found in riparian or other wetland habitats in the wild, though proving drought-tolerant in cultivation. The hybrid London Plane has proved particularly tolerant of urban conditions.

They are often known in English as planes or plane trees. Some North American species are called sycamores (especially Platanus occidentalis[2]), although that term also refers to either the fig Ficus sycomorus, the plant originally so named, or the Great, or Sycamore Maple, Acer pseudoplatanus.[2]

Botany[edit]

Bole of an aged Platanus, in Trsteno, near Dubrovnik, Croatia

The flowers are reduced and are borne in balls (globose heads); 3–7 hairy sepals may be fused at the base, and the petals are 3–7 and are spatulate. Male and female flowers are separate, but borne on the same plant (monoecious). The number of heads in one cluster (inflorescence) is indicative of the species (see table below). The male flower has 3–8 stamens; the female has a superior ovary with 3–7 carpels. Plane trees are wind-pollinated. Male flower-heads fall off after shedding their pollen.

After being pollinated, the female flowers become achenes that form an aggregate ball. But The fruit is a multiple of achenes (plant systematics, Simpson M. G., 2006).Typically, the core of the ball is 1 cm in diameter and is covered with a net of mesh 1 mm, which can be peeled off. The ball is 2.5–4 cm in diameter and contains several hundred achenes, each of which has a single seed and is conical, with the point attached downward to the net at the surface of the ball. There is also a tuft of many thin stiff yellow-green bristle fibers attached to the base of each achene. These bristles help in wind dispersion of the fruits as in the dandelion.

The leaves are simple. In the subgenus Platanus they have a palmate outline. The base of the leaf stalk (petiole) is enlarged and completely wraps around the young stem bud in its axil. The axillary bud is exposed only after the leaf falls off.

The mature bark peels off or exfoliates easily in irregularly shaped patches, producing a mottled, scaly appearance. On old trunks, bark may not flake off, but thickens and cracks instead.

Phylogeny[edit]

There are two subgenera, subgenus Castaneophyllum containing the anomalous P. kerrii, and subgenus Platanus, with all the others; recent studies in Mexico[3] have increased the number of accepted species in this subgenus. Within subgenus Platanus, genetic evidence suggests that P. racemosa is more closely related to P. orientalis than it is to the other North American species.[4] There are fossil records of plane trees as early as 115 million years (the Lower Cretaceous). Despite the geographic separation between North America and Old World, species from these continents will cross readily resulting in fertile hybrids such as the London Plane.

Species[edit]

The following are recognized species of plane trees:

Botanic nameCommon namesDistributionFlowerheadsNotes
Platanus × acerifolia
(P. occidentalis × P. orientalis;
syn. P. × hispanica, P. × hybrida)
London Plane, Hybrid PlaneCultivated origin1–6Subgenus Platanus
Platanus chiapensisChiapas Planesoutheast Mexico ?Subgenus Platanus
Platanus gentryiGentry's Planewestern Mexico ?Subgenus Platanus
Platanus kerriiKerr's PlaneLaos, Vietnam10–12Subgenus Castaneophyllum
Platanus mexicanaMexican Planenortheast and central Mexico2–4Subgenus Platanus
Platanus oaxacanaOaxaca Planesouthern Mexico ?Subgenus Platanus
Platanus occidentalisAmerican Sycamore, American Plane, Buttonwood, Occidental Planeeastern North America1–2Subgenus Platanus
Platanus orientalisOriental Planesoutheast Europe, southwest Asia3–6Subgenus Platanus
Platanus racemosaCalifornia Sycamore, Western Sycamore, AlisoCalifornia, Baja California3–7Subgenus Platanus
Platanus rzedowskiiRzedowski's Planeeastern Mexico ?Subgenus Platanus
Platanus wrightiiArizona SycamoreArizona, New Mexico, northwest Mexico2–4Subgenus Platanus

Diseases[edit]

Planes are susceptible to Plane Anthracnose (Apiognomonia veneta), a fungal disease that can defoliate the trees in some years. The worst infections are associated with cold, wet spring weather. P. occidentalis and the other American species are the most susceptible, with P. orientalis the most resistant. The hybrid London Plane is intermediate in resistance.

Ceratocystis platani, a wilt disease, has become a significant problem in recent years in much of Europe.[5]

Other diseases such as powdery mildew occur frequently, but are of lesser importance.

Platanus species are used as food plants by the larvae of some Lepidoptera species including Phyllonorycter platani and Setaceous Hebrew Character.

In the 21st century a disease, commonly known as Massaria disease, has attacked Plane trees across Europe. It is caused by the fungus Splanchnonema platani, and causes large lesions on the upper sides of branches.[6][7]

Uses[edit]

The principal use of these trees is as ornamental trees, especially in urban areas and by roadsides. The London plane is particularly popular for this purpose. The American plane is cultivated sometimes for timber and investigations have been made into its use as a biomass crop. The oriental plane is widely used as an ornamental and also has a number of minor medicinal uses.

Cultural history[edit]

Most significant aspects of cultural history apply to Platanus orientalis in the Old World.

The legendary Dry tree first recorded by Marco Polo was possibly a platanus. According to the legend, it marked the site of the battle between Alexander the Great and Darius III.

Footnotes[edit]

  1. ^ Sunset Western Garden Book 1995.
  2. ^ a b Merriam Webster.
  3. ^ Nixon & Poole 2003.
  4. ^ Feng, Oh & Manos 2005.
  5. ^ Pathology note 7 2008.
  6. ^ "Massaria disease". Forestry Commission. Retrieved November 7, 2012. 
  7. ^ "Massaria disease of plane trees". Treetree. Retrieved November 7, 2012. 

References[edit]

Books
  • Naumann, Helmut (2007). "Die Platane von Gortyna". In Kämmerer., Thomas Richard. Studien zu Ritual und Sozialgeschichte im Alten [Orient / Studies on Ritual and Society in the Ancient Near East. Tartuer Symposien 1998–2004]. Berlin, de Gruyter,. pp. 207–226. 
  • Sunset Western Garden Book. 1995. pp. 606–607. 
Journals
Web
  • "Sycamore", Merriam-Webster Online Dictionary, retrieved 2009-08-04 
  • "Pathology note 7". The Research Agency of the Forestry Commission. 2008. 
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