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The Lethal webcaps, two species in the genus Cortinarius, belong to the world's most poisonous mushrooms. The species are the Deadly webcap (Cortinarius rubellus, formerly also known as C. speciosissimus) and the Fool's webcap, C. orellanus.
The mushrooms' characteristics are quite common, making them difficult to identify, which often leads to fatal poisonings. Young examples of the species often have a veil between the cap of the mushroom and the stem. This veil looks like a cobweb, hence the name. The veil however partially or completely disappears in older specimens. Some other characteristics for each of the mushrooms are given below.
Additional recommended knowledge
Deadly webcap (Cortinarius rubellus)
Spore color: Rusty brown to orange
Fool's webcap (Cortinarius orellanus)
Spore color: Rusty brown to orange
Both of these mushrooms can be confused with each other and many incidents of mushroom poisoning have occurred where inexperienced mushroom hunters have confused these mushrooms with edible mushrooms such as the chanterelle. One should be especially cautious when picking mushrooms like the cleaned funnel chanterelles as these mushrooms share the same habitat as the deadly webcap and the fool's webcap. In many incidents where this mushroom has been ingested, death has occurred.
In Poland during the 1950s there was a small epidemic where over 100 people became ill. What caused the illness remained a mystery until 1952 when Polish physician Dr. S. Grzymała discovered that everyone suffering from the illness, which had now claimed several lives, had eaten the mushroom Cortinarius orellanus.
Unlike some other species of mushroom, webcaps should never be identified by tasting a small portion of the mushroom. These mushrooms are sometimes stated to be so poisonous that one could be poisoned even after tasting and spitting out a small piece. However, the lethal dose in mice is about 2 g per kg body weight, which translates to about 100–150 g for an adult human.[Holmdahl, 2001] Nevertheless, some mycologists strongly recommend against tasting unknown mushrooms.
The Deadly webcap and the Fool's webcap both contain the toxin orellanin. A characteristic of orellanin poisoning is the long latency; the first symptoms usually don't appear until 2-3 days after ingestion and can in some cases take as long as 3 weeks. The first symptoms of orellanin poisoning are similar to the common flu (nausea, vomiting, stomach pains, headaches, etc.). These symptoms are followed by early stages of renal failure (immense thirst, frequent urination, pain on and around the kidneys), and eventually decreased or nonexistent urine output and other symptoms of renal failure occur. If left untreated death will follow. There is no known antidote against orellanin poisoning, but early hospitalization and treatment can sometimes prevent serious injuries and usually prevent death. If you suspect orellanin poisoning, acting on it quickly can save your life.
Several more mushrooms in the Cortinarius genus are suspected to contain orellanin or other deadly toxins. Among them are Cortinarius callisteus and Cortinarius limonius.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Lethal_webcaps". A list of authors is available in Wikipedia.|