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Phellinus tremulae is host specific and is restricted to Aspen. Below are some distinguishing characteristics associated with close relatives to the species.
Phellinus extensus: Spore size 3-4 micrometers in diameter, circular, and has only been found in Florida and some islands in the Atlantic with high humidity. Also the setae look like a tear drop. This species if found on dead hardwoods.
Phellinus pomaceus: Spore size 4-5 × 3-4.5 micrometers, ovoid to broadly ellipsoid. Almost only host is Prunus.
Phellinus lundellii: Spores size 4.5-6 × 4-5 micrometers, ovoid to broadly ellipsoid. Has only been found in Tennessee. Records show it is only found on dead Betula (birch) and Alnus (alder).
Phellinus igniarius_: Spore size 5-6.5 × 4.5-6 micrometers with a thick cell wall, circular. See fungi/nov2005.html">Tom Volk’s page on Phellinus igniarius
This species can be found where ever aspen are present. Aspen are present in clear cut areas wherever there is full sun. This species has been found on the west coast and northern regions of the United States, but this does not mean it is restricted to these regions.
Phellinus tremulae is an obligate parasite. This means that the species is host specific and only found on species of Aspen (Populus tremuloides P. grandidentata and related species). The shape is a half circle and shaped like a shelf protruding from the stem of the infect tree. Phellinus tremulae is also perennial and can be found throughout the year. Another very distinguishing macroscopic feature is the layers that are visible when looking down vertically at the fungus. This species spore baring surface is usually brown that may have a whitish film on it that turns black when in contact with Potassium Hydroxide (KOH). Also at the macroscopic level the pores are separable into tubes and are usually seen in layers if the fungus is cut in a cross section. This species contains generative and skeletal hyphae, which give it a rigid, hard structure. Lastly this species causes white rot (consumes lignin).
Microscopic traits of Phellinus tremulae can be easily identifiable. When mounted in Melzer’s solution the spores do not turn blue; therefore they are not amyloid. Another characteristic is spore size and shape. The spores are spherical and there are four per basidium. Also the spore size is 4.5-5 × 4-4.5 micrometers. Setae are often present under the microscope. The setae have a thick cell wall, brown-orange, and range in size from 12-30 × 6-7.5 micrometers.
This species is restricted to growth on Aspen and therefore can not grow without its host.
Phellinus tremulae is host specific and is restricted to Aspen. Below are some distinguishing characteristics associated with close relatives to the species.
Phellinus extensus: Spore size 3-4 micrometers in diameter, circular, and has only been found in Florida and some islands in the Atlantic with high humidity. Also the setae look like a tear drop. This species if found on dead hardwoods.
Phellinus pomaceus: Spore size 4-5 × 3-4.5 micrometers, ovoid to broadly ellipsoid. Almost only host is Prunus.
Phellinus lundellii: Spores size 4.5-6 × 4-5 micrometers, ovoid to broadly ellipsoid. Has only been found in Tennessee. Records show it is only found on dead Betula (birch) and Alnus (alder).
Phellinus igniarius_: Spore size 5-6.5 × 4.5-6 micrometers with a thick cell wall, circular. See fungi/nov2005.html">Tom Volk’s page on Phellinus igniarius
This species has no real commercial or marketable value to people; however it can cause property damage because the infected trees are weakened. The fungus infects the core of the tree (the heartwood) and slowly breaks down this layer. After years of being infected the trunk is so fragile that it can be blown over by the wind. The problem with this is that many trees fall on houses or cars. Even if they fall in parks or yards, they have to be cleaned up, which can be an expensive task.
Phellinus tremulae, the aspen bracket, is a species of polypore fungus in the family Hymenochaetaceae that grows on Populus tremula[2] and on trembling aspen in Canada. The species was first described as Fomes igniarius f. tremulae by Appollinaris Semenovich Bondartsev in 1935. It causes the disease Aspen trunk rot.
Phellinus tremulae, the aspen bracket, is a species of polypore fungus in the family Hymenochaetaceae that grows on Populus tremula and on trembling aspen in Canada. The species was first described as Fomes igniarius f. tremulae by Appollinaris Semenovich Bondartsev in 1935. It causes the disease Aspen trunk rot.
