Cortinarius iodes

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***Cortinarius iodes***, commonly known as the **spotted cort** or the **viscid violet cort**, is a species of agaric fungus in the family Cortinariaceae. The fruit bodies have small, slimy, purple caps up to Template:Convert in diameter that develop yellowish spots and streaks in maturity. The gill color changes from violet to rusty or grayish brown as the mushroom matures. The species range includes the eastern North America, Central America, northern South America, and northern Asia, where it grows on the ground in a mycorrhizal association with deciduous trees. Although edible, the mushroom is not recommended for consumption. *Cortinarius iodeoides*, one of several potential lookalike species, can be distinguished from *C. iodes* by its bitter-tasting cap cuticle.

## Taxonomy

The species was first described scientifically by Miles Joseph Berkeley and Moses Ashley Curtis in 1853. The type collection was made by American botanist Henry William Ravenel in South Carolina. Joseph Ammirati and Howard Bigelow considered *Cortinarius heliotropicus*, described by Charles Horton Peck 1914, to be the same species as *C. iodes* after examining the holotype specimens of both. According to the nomenclatural databases MycoBank and Index Fungorum, however, *Cortinarius iodes* does not have any synonyms. If they are indeed the same species, the name *C. iodes* has priority. *C. iodes* is classified in the subgenus *Myxacium*, along with other *Cortinarius* species that have a slimy cap and stem.

The specific epithet *iodes* means "violet-like". It is commonly known as the "spotted cort" or the "viscid violet cort".

## Description

 File:Cortinarius iodes 17924.jpg
The cap is initially bell-shaped before becoming broadly convex and then flat in maturity (sometimes retaining a broad umbo), and attains a diameter of Template:Convert. The cap surface is slimy (in wet weather) and smooth, and has a lilac or purplish color. The flesh is white, firm, and thin. The color fades in maturity, and the cap develops irregular yellowish spots, or becomes yellowish in the center. Gills are attached to the stem and packed together closely. They are lilac to violet when young, but become rusty brown to grayish cinnamon when the spores mature. The stem measures Template:Convert long by Template:Convert thick, and is nearly equal in width throughout other than a somewhat bulbous base. It is solid (i.e., not hollow), slimy, smooth, and has violet or purplish colors that are usually lighter than the cap; sometimes, the stem base is more or less white. The cobweb-like, pale violet partial veil leaves a zone of thin, purple or rusty fibers on the upper stem. The mushroom has no distinctive taste or odor. Although edible, it is not recommended for consumption.

*Cortinarius iodes* produces a rusty-brown spore print. Spores are elliptical, with a finely roughened surface, measuring 8–10 by 5–6.5 μm. The basidia (spore-bearing cells) are four-spored, club-shaped, and measure 28–39.5 by 9.3–14 μm. Both cheliocystidia and pleurocystidia are absent from the hymenium; the gill edge is populated by basidia and their undeveloped equivalents, basidioles. The cap cuticle comprises a distinctive layer of 3–8 μm-wide hyphae that form a layer usually 110–125 μm thick; this layer is less distinct or thinner in old or poorly preserved specimens. Clamp connections are present in hyphae throughout the fruit body.

### Similar species

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*Cortinarius iodes* is a fairly distinctive species and its combination of characteristics make it readily identifiable. Several other *Cortinarius* species have evolved a slimy coating that probably help protects the fruit bodies from predation by insects and other invertebrates. Other field techniques can be used to help identify dry fruit bodies that have lost their slime coat: by checking for leaf and twig debris adhering to the surface, or, by kissing the cap and stem to exploit the lips' enhanced sensitivity to stickiness. *C. iodeoides* is virtually identical in appearance to *C. iodes*, but can be distinguished from the latter by its bitter-tasting cap cuticle and smaller, narrower spores measuring 7.7–9.3 by 4.6–5.4 μm. The "violet cort" (*Cortinarius violaceus*) has a dry, scaly, dark purple cap and stem. The "pungent cort" (*Cortinarius traganus*) has a dry, light purple cap and stem and a bad odor. Two other widespread *Cortinarius* species with violet coloring and a slimy cap, *C. salor* and *C. croceocaeruleus*, can be distinguished from *C. iodes* by the absence of yellowish spotting. A North American species *C. oregonensis* has a paler lilac cap with a central region that is yellowish or brownish, and smaller spores that measure 7–8 by 4–5 μm. A non-*Cortinarius* lookalike, *Inocybe lilacina*, has a dry, silky cap that features a prominent umbo.

## Habitat and distribution

*Cortinarius iodes* forms mycorrhizal associations with deciduous trees, particularly oaks. The fruit bodies of *Cortinarius iodes* sometimes grow singly, but more often scattered or in groups under hardwood trees, in humus and litterfall. Typical habitats include bog edges, swampy areas, and hummocks. Fruiting usually occurs from July to November. In North America, it is common in eastern regions, and rare in the Pacific Northwest. Its distribution extends from eastern Canada south into Central America and northern regions of South America. It also occurs in northern Asia.

## See also

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* List of *Cortinarius* species

## References

1. ↑ Cite error: Invalid `<ref>` tag; no text was provided for refs named `Berkeley 1853`
2. ↑ 2.0 2.1 2.2 2.3 2.4 Cite error: Invalid `<ref>` tag; no text was provided for refs named `Ammirati 1984`
3. ↑ Cite error: Invalid `<ref>` tag; no text was provided for refs named `urlMycoBank: Cortinarius iodes`
4. ↑ Cite error: Invalid `<ref>` tag; no text was provided for refs named `urlFungorum: Cortinarius iodes`
5. ↑ 5.0 5.1 5.2 5.3 5.4 Cite error: Invalid `<ref>` tag; no text was provided for refs named `Roberts 2011`
6. ↑ 6.0 6.1 6.2 Cite error: Invalid `<ref>` tag; no text was provided for refs named `Roody 2003`
7. ↑ 7.0 7.1 7.2 Cite error: Invalid `<ref>` tag; no text was provided for refs named `Bessette 1997`
8. ↑ 8.0 8.1 Cite error: Invalid `<ref>` tag; no text was provided for refs named `Bessette 1987`
9. ↑ 9.0 9.1 Cite error: Invalid `<ref>` tag; no text was provided for refs named `Phillips 2005`
10. ↑ Cite error: Invalid `<ref>` tag; no text was provided for refs named `Kibby 1994`
11. ↑ Cite error: Invalid `<ref>` tag; no text was provided for refs named `Smith 1939`

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