Scarlet elf cup

Appearance

Initially spherical, the fruit bodies are later shallowly saucer- or cup-shaped with rolled-in rims, and measure 2–5 cm in diameter. The inner surface of the cup is deep red and smooth, while the outer surface is whitish and covered with a dense matted layer of tiny hairs . The stipe, when present, is stout and up to 4 cm long by 0.3–0.7 cm thick, and whitish, with a tomentum. Color variants of the fungus exist that have reduced or absent pigmentation; these forms may be orange, yellow, or even white . In the Netherlands, white fruit bodies have been found growing in the polders.

''Sarcoscypha coccinea'' is one of several fungi whose fruit bodies have been noted to make a "puffing" sound—an audible manifestation of spore-discharge where thousands of asci simultaneously explode to release a cloud of spores.

Spores are 26–40 by 10–12 µm, elliptical, smooth, hyaline , and have small lipid droplets concentrated at either end. The droplets are refractive to light and visible with light microscopy. In older, dried specimens , the droplets may coalesce and hinder the identification of species. Depending on their geographical origin, the spores may have a delicate mucilaginous sheath or "envelope"; European specimens are devoid of an envelope while specimens from North America invariably have one.

The asci are long and cylindrical, and taper into a short stem-like base; they measure 300–375 by 14–16 µm. Although in most Pezizales all of the ascospores are formed simultaneously through delimitation by an inner and outer membrane, in ''S. coccinea'' the ascospores located in the basal parts of the ascus develop faster. The paraphyses are about 3 µm wide , and contain red pigment granules.

Naming

The species was originally named ''Helvella coccinea'' by the Italian naturalist Giovanni Antonio Scopoli in 1772. Other early names include ''Peziza coccinea'' and ''Peziza dichroa'' . Although some authors in older literature have applied the generic name ''Plectania'' to the taxon following Karl Fuckel's 1870 name change , that name is now used for a fungus with brownish-black fruit bodies. ''Sarcoscypha coccinea'' was given its current name by Jean Baptiste Émil Lambotte in 1889. Obligate synonyms include ''Lachnea coccinea'' Gillet , ''Macroscyphus coccineus'' Gray , and ''Peziza dichroa'' Holmskjold . Taxonomic synonyms include ''Peziza aurantia'' Schumacher , ''Peziza aurantiaca'' Persoon , ''Peziza coccinea'' Jacquin , ''Helvella coccinea'' Schaeffer , ''Lachnea coccinea'' Phillips , ''Geopyxis coccinea'' Massee , ''Sarcoscypha coccinea'' Saccardo ex Durand , ''Plectania coccinea'' , and ''Peziza cochleata'' Batsch .

''Sarcoscypha coccinea'' is the type species of the genus ''Sarcoscypha'', having been first explicitly designated as such in 1931 by Frederick Edward Clements and Cornelius Lott Shear. A 1990 publication revealed that the genus name ''Sarcoscypha'' had been used previously by Carl F.P. von Martius as the name of a tribe in the genus ''Peziza''; according to the rules of Botanical Nomenclature, this meant that the generic name ''Peziza'' had priority over ''Sarcoscypha''. To address the taxonomical dilemma, the genus name ''Sarcoscypha'' was conserved against ''Peziza'', with ''S. coccinea'' as the type species, to "avoid the creation of a new generic name for the scarlet cups and also to avoid the disadvantageous loss of a generic name widely used in the popular and scientific literature". The specific epithet ''coccinea'' is derived from the Latin word meaning "deep red". The species is commonly known as the "scarlet elf cup", the "scarlet elf cap", or the "scarlet cup fungus".

''S. coccinea'' var. ''jurana'' was described by Jean Boudier as a variety of the species having a brighter and more orange-colored fruit body, and with flattened or blunt-ended ascospores. Today it is known as the distinct species ''S. jurana''. ''S. coccinea'' var. ''albida'', named by George Edward Massee in 1903 , has a cream-colored rather than red interior surface, but is otherwise identical to the typical variety.

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Within the large area that includes the temperate to alpine-boreal zone of the northern hemisphere , only ''S. coccinea'' had been recognized until the 1980s. However, it had been known since the early 1900s that there existed several macroscopically indistinguishable taxa with various microscopic differences: the distribution and number of oil droplets in fresh spores; germination behavior; and spore shape. Detailed analysis and comparison of fresh specimens revealed that what had been collectively called "''S. coccinea''" actually consisted of four distinct species: ''S. austriaca'', ''S. coccinea'', ''S. dudleyi'', and ''S. jurana''.

The phylogenetic relationships in the genus ''Sarcoscypha'' were analyzed by Francis Harrington in the late 1990s. Her cladistic analysis combined comparisons of the sequences of the internal transcribed spacer in the non-functional RNA with fifteen traditional morphological characteristics, such as spore features, fruit body shape, and degree of curliness of the "hairs" that form the tomentum. Based on her analysis, ''S. coccinea'' is part of a clade that includes the species ''S. austriaca'', ''S. macaronesica'', ''S. knixoniana'' and ''S. humberiana''. All of these ''Sarcoscypha'' species have numerous, small oil droplets in their spores. Its closest relative, ''S. macaronesica'', is found on the Canary Islands and Madeira; Harrington hypothesized that the most recent common ancestor of the two species originated in Europe and was later dispersed to the Macaronesian islands.Similar species include ''S. dudleyi'' and ''S. austriaca'', and in the literature, confusion amongst the three is common. Examination of microscopic features is often required to definitively differentiate between the species. ''Sarcoscypha occidentalis'' has smaller cups , a more pronounced stalk that is 1–3 cm long, and a smooth exterior surface. Unlike ''S. coccinea'', it is only found in the New World and in east and midwest North America, but not in the far west. It also occurs in Central America and the Caribbean. In North America, ''S. austriaca'' and ''S. dudleyi'' are found in eastern regions of the continent. ''S. dudleyi'' has elliptical spores with rounded ends that are 25–33 by 12–14 µm and completely sheathed when fresh. ''S. austriaca'' has elliptical spores that are 29–36 by 12–15 µm that are not completely sheathed when fresh, but have small polar caps on either end. The Macaronesian species ''S. macaronesica'', frequently misidentified as ''S. coccinea'', has smaller spores, typically measuring 20.5–28 by 7.3–11 µm and smaller fruit bodies—up to 2 cm wide.

Distribution

A saprobic species, ''Sarcoscypha coccinea'' grows on decaying woody material from various plants: the rose family, beech, hazel, willow, elm, and, in the Mediterranean, oak. The fruit bodies of ''S. coccinea'' are often found growing singly or clustered in groups on buried or partly buried sticks in deciduous forests. A Hungarian study noted that the fungus was found mainly on twigs of European hornbeam that were typically less than 5 cm long. Fruit bodies growing on sticks above the ground tend to be smaller than those on buried wood. Mushrooms that are sheltered from wind also grow larger than their more exposed counterparts. The fruit bodies are persistent and may last for several weeks if the weather is cool. The time required for the development of fruit bodies has been estimated to be about 24 weeks, although it was noted that "the maximum life span may well be more than 24 weeks because the decline of the colonies seemed to be associated more with sunny, windy weather rather than with old age." One field guide calls the fungus "a welcome sight after a long, desperate winter and ... the harbinger of a new year of mushrooming."

Common over much of the northern hemisphere, ''S. coccinea'' occurs in the midwest, in the valleys between the Pacific coast, the Sierra Nevada, and the Cascade Range. Its North American distribution extends north to various locations in Canada and south to the Mexican state Jalisco. The fungus has also been collected from Chile in South America. It is also found in the Old World—Europe, Africa, Asia, Australia, and India. Specimens collected from the Macaronesian islands that once thought to be ''S. coccinea'' were later determined to be the distinct species ''S. macaronesica''. A 1995 study of the occurrence of British ''Sarcoscypha'' concluded that ''S. coccinea'' was becoming very rare in Great Britain. All species of ''Sarcoscypha'', including ''S. coccinea'', are Red-listed in Europe.

Habitat

A saprobic species, ''Sarcoscypha coccinea'' grows on decaying woody material from various plants: the rose family, beech, hazel, willow, elm, and, in the Mediterranean, oak. The fruit bodies of ''S. coccinea'' are often found growing singly or clustered in groups on buried or partly buried sticks in deciduous forests. A Hungarian study noted that the fungus was found mainly on twigs of European hornbeam that were typically less than 5 cm long. Fruit bodies growing on sticks above the ground tend to be smaller than those on buried wood. Mushrooms that are sheltered from wind also grow larger than their more exposed counterparts. The fruit bodies are persistent and may last for several weeks if the weather is cool. The time required for the development of fruit bodies has been estimated to be about 24 weeks, although it was noted that "the maximum life span may well be more than 24 weeks because the decline of the colonies seemed to be associated more with sunny, windy weather rather than with old age." One field guide calls the fungus "a welcome sight after a long, desperate winter and ... the harbinger of a new year of mushrooming."

Common over much of the northern hemisphere, ''S. coccinea'' occurs in the midwest, in the valleys between the Pacific coast, the Sierra Nevada, and the Cascade Range. Its North American distribution extends north to various locations in Canada and south to the Mexican state Jalisco. The fungus has also been collected from Chile in South America. It is also found in the Old World—Europe, Africa, Asia, Australia, and India. Specimens collected from the Macaronesian islands that once thought to be ''S. coccinea'' were later determined to be the distinct species ''S. macaronesica''. A 1995 study of the occurrence of British ''Sarcoscypha'' concluded that ''S. coccinea'' was becoming very rare in Great Britain. All species of ''Sarcoscypha'', including ''S. coccinea'', are Red-listed in Europe.

Uses

''Sarcoscypha coccinea'' was used as a medicinal fungus by the Oneida Indians, and possibly by other tribes of the Iroquois Six Nations. The fungus, after being dried and ground up into a powder, was applied as a styptic, particularly to the navels of newborn children that were not healing properly after the umbilical cord had been severed. Pulverized fruit bodies were also kept under bandages made of soft-tanned deerskin. In Scarborough, England, the fruit bodies used to be arranged with moss and leaves and sold as a table decoration.

The species is said to be edible, inedible, or "not recommended", depending on the author. Although its insubstantial fruit body and low numbers do not make it particularly suitable for the table, one source claims "children in the Jura are said to eat it raw on bread and butter; and one French author suggests adding the cups, with a little Kirsch, to a fresh fruit salad." The fruit bodies have been noted to be a source of food for rodents in the winter, and slugs in the summer.