Pleurocybella porrigens

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Pleurocybella porrigens
Pleurocybella 050919low.jpg
Scientific classification
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P. porrigens
Binomial name
Pleurocybella porrigens
(Pers.) Singer (1947)[1]
Pleurocybella Porrigens
View the Mycomorphbox template that generates the following list
Mycological characteristics
gills on hymenium
cap is infundibuliform
hymenium is decurrent
stipe is bare
spore print is white
ecology is saprotrophic
edibility: not recommended

Pleurocybella porrigens is a species of fungus in the Marasmiaceae family. The species is widespread in temperate forests of the Northern Hemisphere.[2] P. porrigens, known as the angel wing, is a white-rot wood-decay fungus on conifer wood, particularly hemlock (genus Tsuga).[3] The flesh is thin and fragile compared to the oyster mushrooms (Pleurotus ssp.).

Pleurocybella porrigens has historically been generally regarded as edible[3][4] but this has been brought into question by recent deaths apparently associated with P. porrigens consumption.

Synonyms for Pleurocybella porrigens include Pleurotus porrigens, Phyllotus porrigens, Dendrosarcus porrigens, Pleurotellus porrigens, and Nothopanus porrigens.

Toxicity[edit]

Angel wing growing on a decaying log in Dundreggan, Scotland.

Although P. porrigens is generally regarded as edible,[3][4] as of 2011, it has been implicated in two documented outbreaks involving fatal encephalopathy. Both incidents were in Japan, and most victims had pre-existing kidney disorders.[5][6][7] Of the two total cases of outbreaks in Japan, it remains a mathematical anomaly how any number of outbreaks involving victims with pre-existing kidney disorders could be described, statistically, as being "most" or representing the majority of total cases.

The first incident occurred in September and October 2004[8] across nine prefectures in Japan, and involved the sickening of 59 people and the eventual death of 17.[5] Most of those who died had pre-existing liver problems, and the average age of those affected was 70.[5] Death occurred between 13 and 29 days after the onset of symptoms, and the onset of symptoms occurred at most three weeks after consumption of P. porrigens.[8]

The second incident occurred in 2009, when a 65-year-old man who had been on hemodialysis died from acute encephalopathy after eating P. porrigens.[5]

The mechanism of action for the toxicity of P. porrigens has not been definitively established,[5] but several possibilities have been suggested. It has been demonstrated that P. porrigens contains an unusual unstable amino acid which is toxic to the brain cells of rats in cell culture studies,[5][9] but it has not yet been possible to definitively determine that this was the cause of the fatal encephalopathies.[5] Other mechanisms have been suggested for P. porrigens's apparent toxicity, including the possibility that the fungus may contain toxic levels of cyanide salts.[10]

Confusion[edit]

Pleurocybella porrigens received this name because of the extravagant form and for being non-gelatinous. Thus, it is quite difficult to confuse, for example with Cheimonophyllum sin. Pleurotus candidissimum (inedible),[11] Crepidotus mollis (inedible),[12] Panellus mitis (inedible)[13] or Pleurotus cornucopiae (edible),[14] Pleurotus ostreatus var. (white form, very delicious),[15] Pleurotus pulmonarius (edible),[16] but perhaps even with Cantharellus cibarius var. bicolored (very tasty[17] or Craterellus melanoxeros sin. Cantharellus janthinoxanthus (very tasty),[17]

See also[edit]

References[edit]

  1. ^ Singer R. (1947). "New genera of fungi. III". Mycologia. 39 (1): 77–89. doi:10.2307/3755289. JSTOR 3755289. PMID 20283546.
  2. ^ Kirk PM, Cannon PF, Minter DW, Stalpers JA (2008). Dictionary of the Fungi (10th ed.). Wallingford, UK: CAB International. p. 548. ISBN 9780851998268.
  3. ^ a b c Trudell S, Ammirati J (2009). Mushrooms of the Pacific Northwest. Timber Press Field Guides. Portland, Oregon: Timber Press. p. 137. ISBN 0881929352.
  4. ^ a b Arora D. (1986). Mushrooms Demystified (2nd ed.). Berkeley, California: Ten Speed Press. p. 135. ISBN 0898151694.
  5. ^ a b c d e f g Michael W. Beug. "Pleurocybella porrigens toxin unmasked?". McIlvainea, Journal of American Amateur Mycology. Retrieved June 1, 2011.
  6. ^ Saviuc P, Danel V (2006). "New Syndromes in Mushroom Poisoning". Toxicological Reviews. 25 (3): 199–209. doi:10.2165/00139709-200625030-00004. PMID 17192123.
  7. ^ Fumitake Gejyo; Noriyuki Homma; Noboru Higuchi; Ken Ataka; Tomoko Teramura; Bassam Alchi; Yukio Suzuki; Schinichi Nishi; Ichiei Narita (2005). "A novel type of encephalopathy associated with mushroom Sugihiratake ingestion in patients with chronic kidney diseases". Kidney International. 68 (1): 188–192. doi:10.1111/j.1523-1755.2005.00393.x. PMID 15954908.
  8. ^ a b Kato T, Kawanami T, Shimizu H, Kurokawa K, Sato H, Nakajima K, Nomoto T, Seta T, Kamei T, Yoshino H, Sasagawa I, Ito M, Karasawa S, Kimura H, Suzuki Y, Degawa N, Tagawa A, Ataka K, Ando S, Omae T, Shikama Y (2004). "An outbreak of encephalopathy after eating autumn mushroom (Sugihiratake; Pleurocybella porrigens) in patients with renal failure: A clinical analysis of ten cases in Yamagata, Japan". No to shinkei = Brain and nerve. 56 (12): 999–1007. PMID 15729876.
  9. ^ Wakimoto T, Asakawa T, Akahoshi S, Suzuki T, Nagai K, Kawagishi H, Kan T (2011). "Proof of the existence of an unstable amino acid: pleurocybellaziridine in Pleurocybella porrigens". Angewandte Chemie International Edition. 50 (5): 1168–1170. doi:10.1002/anie.201004646. PMID 21268219.
  10. ^ Akiyama H, Toshihko T, Shinobu S, Yoshiaki A, Kazunari K, Yoshiko S-K, Tamio M (2006). "Determination of cyanide and thiocyanate in Sugihiratake mushroom using HPLC method with fluorometric detection" (PDF). Journal of Health Science–Tokyo. 52 (1): 73–77. doi:10.1248/jhs.52.73.
  11. ^ [Rolf Singer: „Cheimonophyllum candidissimum (Berk. & M.A. Curtis)”, în: „ Sydowia”, vol. IX (1-6), Editura Ferdinand Berger & Söhne G.m.b.H., Viena 1955, p. 417
  12. ^ Hans E. Laux: „Der große Pilzführer, Editura Kosmos, Halberstadt 2001, p. 334-335, ISBN 978-3-440-14530-2
  13. ^ Hans E. Laux: „Der große Pilzführer, Editura Kosmos, Halberstadt 2001, p. 192-193, ISBN 978-3-440-14530-2
  14. ^ Bruno Cetto: „Der große Pilzführer”, vol. 2, Editura BLV Verlagsgesellschaft, München, Berna, Viena 1980, p. 476-477, ISBN 3-405-12081-0
  15. ^ I funghi dal vero, vol. 5, Editura Arte Grafiche Saturnia, Trento 1986, p. 418-419, ISBN 88-85013-37-6
  16. ^ Bruno Cetto: „Der große Pilzführer”, vol. 3, Editura BLV Verlagsgesellschaft, München, Berna, Viena 1980, p. 414-415, ISBN 3-405-12124-8
  17. ^ a b Bruno Cetto: „Der große Pilzführer”, vol. 3, Editura BLV Verlagsgesellschaft, München, Berna, Viena 1980, p. 450-451, ISBN 3-405-12124-8

External links[edit]