Guepinia

Guepinia is a genus of fungus in the Auriculariales order. It is a monotypic genus, containing the single species Guepinia helvelloides, commonly known as the apricot jelly. The fungus produces salmon-pink, ear-shaped, gelatinous fruit bodies that grow solitarily or in small tufted groups on soil, usually associated with buried rotting wood. The fruit bodies are tall and up to wide; the stalks are not well-differentiated from the cap. The fungus, although rubbery, is edible, and may be eaten raw with salads, pickled, or candied. It has a white spore deposit, and the oblong to ellipsoid spores measure 9–11 by 5–6 micrometers. The fungus is widely distributed in the Northern Hemisphere, and has also been collected from South America.
Taxonomy.
The species was first described and illustrated as "Tremella rufa" by Nicolaus Joseph von Jacquin in 1778. Elias Magnus Fries later (1828) called it "Guepinia helvelloides" in his "Elenchus Fungorum", based on Augustin Pyramus de Candolle's "Tremella helvelloides", both being names he sanctioned. This has made "Tremella rufa" and all names based on it unavailable for use, as they are conserved. Later, Lucien Quélet erected a separate monotypic genus "Phlogiotis" for Jacquin's species, whereas Julius Oscar Brefeld placed it (as "Gyrocephalus rufa") in Persoon's small genus "Gyrocephalus" (rejected name for "Gyromitra"). The proper name for the fungus was debated for some time, as the name "Guepinia" is a homonym (pointed out by Fries in 1828), because it had been used by Toussaint Bastard in 1812 for a genus of flowering plants in the Cruciferae family. To further complicate matters, the generic name "Teesdalia", originally considered to have priority over the name "Guepinia" for the plant genus, was later determined to have been validly published after "Guepinia", rendering "Teesdalia" an illegitimate name. In 1982, changes in the International Code for Botanical Nomenclature gave protected status to all names adopted by Fries in the "Elenchus Fungorum", and established "Guepinia" as the correct genus name.
"Guepinia" is variously classified in the Auriculariales order, with uncertain familial position ("incertae sedis"), or as part of the Exidiaceae family.
The genus is named after French mycologist Jean-Pierre Guépin (1779–1858). The mushroom is commonly known as the "red jelly fungus", or "apricot jelly".
Description.
The fruit bodies of "Guepinia helvelloides" grow singly or in small clumps. Although they can appear to be growing in the soil, their mycelium lives in buried wood. They are tall and wide, spoon- or tongue-shaped, and twisted like a cornet or horn so that they look like a slender funnel, cut out on one side and often with a wavy margin. The fruit bodies are flexible, thick, and smooth on the outer side which they are usually attenuated on the underside into a cylindrical or depressed stem that is up to high and about thick. The stem is normally covered with a white tomentum at the base. The upper side (inside) of the fruit body is usually quite sterile or with a few isolated basidia and is slightly verrucose as a result of the densely crowded protruding ends of the hyphae. The sterile and fertile surfaces of the fruit body are almost the same color, transparent reddish-orange to flesh pink or flesh orange, at other times more purplish-red. The fruit bodies usually develop a slightly brownish tinge when they are old. The underside is usually slightly more vividly colored than the upper side. The flesh is gelatinous, softly so in the upper part of the fruit body and with a more cartilage-like consistency in the stem. It has a nondescript odor, and a watery, insignificant taste.
The hymenium is developed on the under (outer) side of the fruit body. The basidia (spore-bearing cells) consist of a globular part (the hypobasidia) to which inflated or elongated epibasidia are attached. In "Guepinia", the hypobasidia are egg-shaped to ellipsoid, measuring 12–16 by 9–12 μm, and attached to fibril-like epibasidia that are 20–45 by 3–4 μm. The spore deposit is white, while the spores are 9–11 by 5–6 μm, hyaline (translucent), cylindrical to elongated ellipsoid in shape, and have a large oil drop.
Edibility.
"Guepinia helvelloides" is an edible, but bland, fungus. Older specimens are usually tough and indigestible. It can be used raw in salads, for pickling in vinegar and also for preserving in sugar like [[candied fruit] wine by [[fermentation (wine)|fermenting]] with [[yeast#Wine|wine yeast]].
Similar species.
[[File:Cantharellus cinnabarinus 93293.jpg|thumb|right|The red chanterelle ("Cantharellus cinnabarinus") has gills on the undersurface.]]
"Guepinia helvelloides" has a rather unusual appearance, and is not likely to be mistaken for other fungi. However, the red [[chanterelle]] species "[[Cantharellus cinnabarinus]]" is superficially similar; unlike "G. helvelloides", however, it does not have a rubbery and gelatinous texture, and its undersurface is wrinkled, not smooth.
Habitat and distribution.
"Guepinia helvelloides" is [[saprobic]], deriving nutrients by breaking down organic matter. The fruit bodies of "G. helveloides" typically grow solitarily or in small [[wikt:tuft|tufts]] on soil, usually in association with buried rotting wood. Although the fruit bodies sometimes appear in the spring, they are more commonly found in the summer and autumn months. In North America, it is associated with [[coniferous forest]]s. It is also found throughout [[temperate]] North America, from Canada to Mexico. Europe, Iran, and Turkey. It is also known from Brazil and Puerto Rico. The fungus has also been collected from the [[Qinling Mountains|Qinling]] region of China.
External links.
[[Category:Auriculariales]]
[[Category:Edible fungi]]
[[Category:Fungi of Asia]]
[[Category:Fungi of Europe]]
[[Category:Fungi of North America]]
[[Category:Fungi of South America]]
[[Category:Monotypic Basidiomycota genera]]
[[Category:Taxa named by Elias Magnus Fries]]