(Bull.) B.K.Cui, M.L.Han & Y.C.Dai (2016)
|pores on hymenium|
|no distinct cap|
|hymenium is decurrent|
|lacks a stipe|
|spore print is white|
|ecology is parasitic|
Fomitopsis betulina (previously Piptoporus betulinus), commonly known as the birch polypore, birch bracket, or razor strop, is a common bracket fungus and, as the name suggests, grows almost exclusively on birch trees. The brackets burst out from the bark of the tree, and these fruit bodies can last for more than a year. Technically, it is an edible mushroom, with a strong, pleasant "mushroomy" odor but a bitter taste. The velvety cut surface of the fruit body was traditionally used as a strop for finishing the edges on razors, and also as a mounting material for insect collections.
The fungus was originally described by Jean Bulliard in 1788 as Boletus betulinus. It was transferred to the genus Piptoporus by Petter Karsten in 1881. Molecular phylogenetic studies suggested that the species was more closely related to Fomitopsis than to Piptoporus, and the fungus was reclassified to Fomitopsis in 2016.
The fruit bodies (basidiocarps) are pale, with a smooth greyish-brown top surface, while the creamy white underside has hundreds of pores that contain the spores. The fruit 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. The spores are cylindrical to ellipsoidal in shape, and measure 3–6 by 1.5–2 μm.
F. betulina has a bipolar mating system where monokaryons or germinating spores can only mate and form a fertile dikaryon with an individual that possesses a different mating-type factor. There are at least 33 different mating-type factors within the British population of this fungus. These factors are all variants or alleles of a single gene, as opposed to the tetrapolar mating system of some other basidiomycete species, which involves two genes.
Range and ecology
Fomitopsis betulinus is one of the most common species of brown rot fungi. The geographic distribution of F. betulina appears to be restricted to the Northern Hemisphere, including Northern America, Europe, and Asia. It is only found on birch trees, including Betula pendula, B. pubescens, B. papyrifera, and B. obscura. There is some doubt about the ability of isolates from the European continent, North America and the British Isles to interbreed.
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. Fire, drought and suppression by other trees are common causes of such stress.
In most infections there is only one fungal individual present, but occasionally several individuals may be isolated from a single tree, and in these cases it is possible that the birch bracket fungus entered after something else killed the tree. These fungal "individuals" can sometimes be seen if a slice of brown-rotted birch wood is incubated in a plastic bag for several days. This allows the white mycelium of the fungus to grow out of the surface of the wood. If more than one individual dikaryon is present, lines of intraspecific antagonism form as the two individual mycelia interact and repel each other.
The fungus can harbor a large number of species of insects that depend on it for food and as breeding sites. In a large-scale study of over 2600 fruit bodies collected in eastern Canada, 257 species of arthropods, including 172 insects and 59 mites, were found. The fungus is eaten by the caterpillars of the fungus moth Nemaxera betulinella. Old fruit bodies that have survived the winter are often colonized by the white to pale yellow fungus Hypocrea pulmonata.
Research on chemical constituents
Fomitopsis betulina has been widely used in traditional medicines, and has been extensively researched for its phytochemistry and pharmacological activity. Polyporenic acid found in the fruit body of the fungus, is poisonous to the parasitic whipworm Trichuris trichura. The fungus was carried by "Ötzi the Iceman" – the 5,300 year old mummy found in Tyrol, with speculation that the fungus may have been used as a laxative to expel whipworm.
- Roberts, Peter; Evans, Shelley (2011). The Book of Fungi. Chicago, Illinois: University of Chicago Press. p. 406. ISBN 978-0-226-72117-0.
- Roody, William C. (2003). Mushrooms of West Virginia and the Central Appalachians. Lexington, Kentucky: University Press of Kentucky. p. 381. ISBN 978-0-8131-9039-6.
- Bulliard, Jean (1787). Herbier de la France (in French). 7. p. plate 312.
- Karsten, P.A. (1881). "Enumeratio Hydnearum Fr. Fennicarum, systemate novo dispositarum". Revue mycologique, Toulouse (in Latin). 3 (9): 17.
- Kim, K.M.; Yoon, Y.-G.; Jung, H.S. (2005). "Evaluation of the monophyly of Fomitopsis using parsimony and MCMC methods". Mycology. 97 (4): 812–822. doi:10.1080/15572536.2006.11832773.
- Ortiz-Santana, B.; Lindner, D.L.; Miettinen, O.; Justo, A.; Hibbett, D.S. (2013). "A phylogenetic overview of the antrodia clade (Basidiomycota, Polyporales)". Mycologia. 105 (6): 1391–1411. doi:10.3852/13-051. PMID 23935025.
- Han, M.L.; Chen, Y.Y.; Shen, L.L.; Song, J.; Vlasak, J.; Dai, Y.C.; Cui, B.K. (2016). "Taxonomy and phylogeny of the brown-rot Fungi: Fomitopsis and its related genera". Fungal Diversity. 80 (1): 343–373. doi:10.1007/s13225-016-0364-y.
- Allaby, Michael (2015). The Dictionary of Science for Gardeners: 6000 Scientific Terms Explored and Explained. Timber Press. p. 76. ISBN 978-1-60469-715-5.
- Holden, Liz (March 2016). "English names for fungi". British Mycological Society. Retrieved 2018-02-04.
- Adams, T J H (1982). Piptoporus betulinus: Some aspects of population biology. (PhD thesis): Exeter University.
- Michael Kuo; Andy Methven (2010). 100 Cool Mushrooms. University of Michigan Press. p. 141. ISBN 978-0-472-03417-8.
- Adams, T.J.H.; Todd, N.K.; Rayner, A.D.M. (1981). "Antagonism between dikaryons of Piptoporus betulinus". Transactions of the British Mycological Society. 76 (3): 510–513. doi:10.1016/s0007-1536(81)80085-x.
- Cant, D (1980). Population studies on Piptoporus betulinus with special reference to the mating system. (PhD thesis): Lancaster University.
- Burnett, J H (1975). Mycogenetics: Introduction to the General Genetics of Fungi. Wiley. p. 390. ISBN 978-0-471-12445-0.
- Pleszczyńska, Małgorzata; Lemieszek, Marta K.; Siwulski, Marek; Wiater, Adrian; Rzeski, Wojciech; Szczodrak, Janusz (2017). "Fomitopsis betulina (formerly Piptoporus betulinus): the Iceman's polypore fungus with modern biotechnological potential". World Journal of Microbiology and Biotechnology. 33 (5): 83. doi:10.1007/s11274-017-2247-0. PMC 5380686.
- Quentin Wheeler; Meredith Blackwell (1984). Fungus-Insect Relationships: Perspectives in Ecology and Evolution. Columbia University Press. p. 147. ISBN 978-0-231-05695-3.
- Gaedike, Reinhard (2015). Tineidae I: (Dryadaulinae, Hapsiferinae, Euplocaminae, Scardiinae, Nemapogoninae and Meessiinae). Microlepidoptera of Europe. 7. Leiden: BRILL. pp. 37–38. ISBN 978-90-04-28916-1.
- Ryvarden, Leif; Melo, I. (2014). Poroid Fungi of Europe. Synopsis Fungorum. 31. Oslo, Norway: Fungiflora. pp. 346–347. ISBN 978-8290724462.
- Guevara-Gonzalez, Ramon; Torres-Pacheco, Irineo (2014). Biosystems Engineering: Biofactories for Food Production in the Century XXI. Springer Science & Business Media. p. 154. ISBN 978-3-319-03880-3.
- Capasso, L. (1998). "5300 years ago, the Ice Man used natural laxatives and antibiotics". Lancet. 352 (9143): 1864. doi:10.1016/S0140-6736(05)79939-6. PMID 9851424.
|Wikimedia Commons has media related to Fomitopsis betulina.|