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Principle decay causing fungi in trees (part 3 of 8)

Armillaria mellea (Honey Fungus)

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Hosts

  • Broadleaves and conifers

 

Significance

  • White rot
  • Windthrow, syptomatic with crown dieback
  • Windsnap if extensive
  • Spreads underground tree to tree

 

Ident Features

  • Brown, honey yellow toadstools in small clusters
  • Over infected roots, stumps, base of trees
  • Button mushrooms expanding to large cap
  • Upper-dark scales
  • Lower-pale cream gills
  • Ring on stem
  • Thin, flat bootlace rhizomorphs
  • Grey-brown to inky blue wood stain changing to orange-brown with pseudosclerotial plates

 

 

 

Phellinus tuberculosus

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Hosts

  • Rosaceae spp, common on Prunus spp

 

Significance

  • Early soft rot
  • Advanced crumbly white rot
  • Purplish-brown zonation
  • Enters large pruning wounds and branch breaks, also degrading heartwood

 

Ident Features

  • Hard woody bracket
  • Resupinate
  • Upper-ashen grey becoming brownish
  • Lower-ashy becoming dark cinnamon-brown

 

 

Ganoderma resinaceum

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Hosts

  • Quercus spp

 

Significance

  • Selective delignification
  • Complete destruction of lignin and wood
  • Intense rot worse than other Ganoderma spp. causing wind throw and snap

 

Ident Features

  • Soft brackets
  • Upper-chestnut blackish w. varnish like resinous crust
  • Surface cracks and melts
  • Lower-tubes, white thin corky flesh becoming cinnamon

 

 

Ganoderma lucidum (Varnished Polypore)

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Hosts:

  • Braodleave stumps

 

Significance

  • Selective delignification
  • Complete destruction of lignin and wood

 

Ident Features

  • Rare on standing trees
  • Brackets w. distinct lateral stalk
  • Upper-red to purple-black, laquered
  • Lower-tubes, white thin corky flesh becoming cinnamon
  • Soft mat of white fungal material

 

 

Ganoderma pfeifferi (Coppery Lacquer Bracket)

 

Hosts

  • Fagus spp

 

Significance

  • Localised selective delignification
  • Considerable dark brown discoloration w straw spots and streaks in decay pockets
  • Windthrow and branch snap if aerial decay
  • Can kill bark where present

 

Ident Features

  • Woody, hoof-shelf brackets
  • Upper-chestnut brown, furrowed w. varnish like resinous crust
  • Surface hard, waxy and melts
  • Lower- white becoming yellow and resinous when maturing

 

 

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