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Piptoporus betulinus

Posted by
Johan Dierckx (Wijnegem, Belgium) on 30 November 2011 in Plant & Nature and Portfolio.

Piptoporus betulinus (NL: Berkenzwam / EN: Birch polypore, Birch bracket, Razor strop / DE: Birkenporling / FR: Polypore du bouleau) is one of the most common polyporous bracket fungi and, as the name suggests, grows almost exclusively on birch trees. The brackets burst out from the bark of the tree, and these fruiting bodies can last for more than a year. The fruiting bodies (basidiocarps) are pale, with a smooth greyish-brown top surface, with the underside a creamy white and with hundreds of pores that contain the spores. The fruiting body has a rubbery texture, becoming corky with age . Wood decayed by the fungus, and cultures of its mycelium, often smell distinctly of green apples. It is a necrotrophic parasite on weakened birches, and will cause brown rot and eventually death, being one of the most common fungi visible on dead birches. It is likely that the birch bracket fungus becomes established in small wounds and broken branches and may lie dormant for years, compartmentalised into a small area by the tree's own defence mechanisms, until something occurs to weaken the tree. The specimen in the image clearly shows "Gravitropism" (a turning or growth movement in response to gravity): the fungus did grow after the tree fell down !

Image: Schoten (B) - 20/09/2011

Canon EOS 400D 1/30 second F/5.6 ISO 200 150 mm

© Johan Dierckx

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All species are photographed in their natural habitat, without cutting or capturing them, and with maximal respect and the least possible disturbance to the environment.

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Joke from Netherlands

Beautiful picture. I just looked around on your blog and found all your other pictures also great. Greetings, Joke

30 Nov 2011 7:49am

@Joke: Dank je, Joke, voor je bezoek en je enthousiaste commentaar. NB: Je mag dus gerust in het Nederlands schrijven...

Ralf Kesper from Fröndenberg, Germany

Excellent close up!

30 Nov 2011 8:40am

@Ralf Kesper: Thanks, Ralf !

Jaytee from Fresno, California, United States

Fabulous fungi. I love your photos.

30 Nov 2011 4:00pm

@Jaytee: I'm realy glad you like my images. The world of fungi is so wonderfull - I just can't stop exploring ...

sietske from roermond, Netherlands

prachtig deze berkenzwam en zo scherp, de kleuren zijn ook heel mooi!
groet Sietske

30 Nov 2011 4:25pm

@sietske: Bedankt alweer voor je bezoekje aan mijn blog. Dit exemplaar van de Berkenzwam vond ik wel bijzonder mooi gevormd ... wat extra moeite voor een foto waard dus. Blij dat je het kan aprrecieren. Groetjes !

john4jack from Corvallis, Oregon, United States

very nice

30 Nov 2011 9:37pm

@john4jack: Thanks, John !

mimicy from Bordeaux, France

Superbe netteté .... presque du 3D ....compliments pour cette superbe photo

30 Nov 2011 10:30pm

@mimicy: Thank you very much, Mimicy, for your nice comment.

Canon EOS 400D
1/30 second
ISO 200
150 mm