Kalapuya brunnea

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Oregon brown truffle
Kalapuya brunnea 53866.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Fungi
Division: Ascomycota
Class: Pezizomycetes
Order: Pezizales
Family: Morchellaceae
Genus: Kalapuya
M.Trappe, Trappe, & Bonito (2010)
Species:
K. brunnea
Binomial name
Kalapuya brunnea
M.Trappe, Trappe, & Bonito (2010)

Kalapuya brunnea is a species of truffle in the monotypic fungal genus Kalapuya. The truffle occurs only in the Pacific Northwest region of the United States, in western Oregon and northern California. Known locally as the Oregon brown truffle, it was formerly thought to be an undescribed species of Leucangium until molecular analysis demonstrated that it was distinct from that genus. The truffle is reddish brown with a rough and warty outer skin, while the interior spore-producing gleba is initially whitish before developing greyish-brown mottling as it matures. Mature truffles have an odor resembling garlicky cheese, similar to mature Camembert. The species has been harvested for culinary purposes in Oregon.

Contents

Taxonomy

Various Morchella

Verpa

Disciotis

Kalapuya

Fischerula

Imaia

Leucangium

A cladogram depicting the phylogeny of Kalapuya and related Morchellaceae genera based on DNA sequences [1]

The species was first described scientifically in 2010, based on specimens collected in February, 2009 from Benton County, Oregon. Before this, it had been known locally for several years as the Oregon brown truffle, and assumed to be an undescribed species of Leucangium , based on its overall resemblance to and similar habitat as the Oregon black truffle, Leucangium carthusianum; [1] it was given the provisional name Leucangium brunneum. [2] Molecular analysis of DNA sequences revealed that the species is not related to the truffle genera of the family Tuberaceae, including Tuber , Dingleya and Reddellomyces . Rather, it has close affinity with the hypogeous (below the soil surface) genera of the Morchellaceae, including Fischerula , Imaia , and Leucangium, but both genetic and morphological characters are sufficiently distinct to warrant designation as a distinct genus. All four hypogeous Morchellaceae genera produce huge spores, with sizes ranging from 32 to 100  micrometers (μm). Both Kalapuya and Imaia have asci (spore-bearing cells) that have thick cell walls when young, but become thin when mature—a trait not shared with Fischerula. The authors explain that although the hypogeous Morchellaceae genera share the trait of large spore size, striking differences in spore structure and other morphological difference in microscopic characters would have ruled out placing them in the same family as Morchella , were it not for the convincing molecular evidence proving their relatedness. [1]

The generic name Kalapuya refers to the Kalapuya people, a Native American ethnic group whose traditional homelands encompassed the range of the fungus. The Kalapuya people, however, are not known to have eaten the truffle, and some regard mushrooms as taboo food.[ citation needed ] The specific epithet brunnea is Latin for "brown", the color of the mature truffle. [1]

Description

Oregon brown truffle is edible, and has been harvested for culinary purposes. Kalapuya brunnea 53868.jpg
Oregon brown truffle is edible, and has been harvested for culinary purposes.

The truffle-like fruit bodies of Kalapuya are roughly spherical, with lobes and furrows, and dimensions of typically 12–60 millimetres (122+38 inches) by 10–45 mm (381+34 in). The peridium (outer "skin") is up to 2 mm thick, and ranges in color from light yellowish-brown to orange-brown to reddish-brown, usually with darker patches in maturity. The surface texture is rough, as the truffle is covered with flat to rounded warts that are 0.5–3 mm wide; larger warts often have smaller warts on them. Older specimens develop narrow cracks over the surface such that it becomes areolate or rimose. The undersurface of the peridium has an branching basal attachment that is roughly similar in texture to cartilage, and which breaks off readily when the truffle is extracted from the soil. The internal spore-bearing tissue, the gleba, is initially whitish and firm, but develops grayish-brown mottling as it matures. [1]

The spores are ellipsoid in shape, with a smooth surface, and contain a large central oil drop surrounded by smaller droplets. The spore dimensions are 32–43 by 25–38  μm, the walls measuring 1–3 μm thick. Although not reactive with Melzer's reagent, spores stain readily with Methyl blue. The asci contain 6 to 8 spores per ascus. They are variably shaped, with dimensions of 70–110 by 60–100 μm, with a stem 10–40 by 6–10 μm, and a forked base. Initially about 3 μm thick, the ascus walls thin to roughly 1 μm when mature. The gleba comprises loosely interwoven, thin-walled hyaline hyphae measuring 5–13 μm in diameter. [1]

Similar species

Leucangium carthusianum , the Oregon black truffle, is roughly similar in appearance, habitat, and growing season, [1] but can be distinguished by its darker (charcoal black) peridium. Microscopically, the spores of Leucangium are larger (60–90 μm) and have a single large oil droplet. L. carthusianum is also edible and prized for its taste and aroma. [3]

Distribution and habitat

The species is known only from the Pacific Northwest region of the United States, where it grows in Douglas fir forests that are up to about 50 years old; the authors suggest that it is obligately symbiotic with this tree. Usually appearing from October through March, fruit bodies grow in the top 2–10 cm (34–4 in) of soil, beneath soil litter, at elevations ranging from roughly sea level to about 500 m (1,600 ft). It occurs on the west side of Oregon's Cascade Range, as well as in the Coastal Ranges of Oregon and northern California. [1]

Uses

The truffle is edible, and has been harvested for culinary purposes, although with less frequency than other Pacific Northwest truffles. [2] Both the flavor and odor of the edible fruit body resemble mature Camembert cheese. [1] One source described the taste as follows: "Served in melted butter on sliced baguette, they reminded of buttered lobster." [4]

See also

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<i>Geopora cooperi</i> Species of fungus

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<i>Tuber oregonense</i> Species of fungus

Tuber oregonense, commonly known as the Oregon white truffle, is a species of edible truffle in the genus Tuber. Described as new to science in 2010, the North American species is found on the western coast of the United States, from northern California to southern British Columbia west of the Cascade Range. A mycorrhizal fungus, it grows in a symbiotic association with Douglas fir. It overlaps in distribution with the closely related T. gibbosum, but they have different growing seasons: T. oregonense typically appears from October through March, while T. gibbosum grows from January to June. The fruit bodies of the fungus are roughly spherical to irregular in shape, and resemble small potatoes up to 5 cm (2 in) in diameter. Inside the truffle is the gleba, which is initially white before it becomes a marbled tan color. The large, often thick-walled, and strongly ornamented spores are produced in large spherical asci. The truffle is highly prized for its taste and aroma. Some individuals have claimed success in cultivating the truffles in Christmas tree farms.

<i>Tuber lijiangense</i> Species of fungus

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<i>Tuber microspermum</i> Species of fungus

Tuber microspermum is a species of truffle in the family Tuberaceae. Described as new to science in 2012, the edible species is found in China. The roughly spherical truffle is up to 1.5 cm (0.6 in) wide and yellowish-brown in color. It is distinguished from other truffles by its small asci and small spores that have a network-like surface pattern punctuated by small spines.

<i>Tuber microspiculatum</i> Species of fungus

Tuber microspiculatum is a species of truffle in the family Tuberaceae. Found in China, it was described as new to science in 2012. The edible species has fruit bodies up to 2.5 cm (1.0 in) wide that range in color from light yellow to reddish brown depending on their age. It is distinguished microscopically from other similar truffles by the honeycomb-like ornamentation on the surface of its spores.

<i>Tuber polyspermum</i> Species of fungus

Tuber polyspermum is a species of truffle in the family Tuberaceae. Found in China, it was described as new to science in 2011. Fruit bodies of the truffle are small and brown, measuring up to 1.5 cm (0.6 in) in diameter.

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<i>Scleroderma verrucosum</i> Species of fungus

Scleroderma verrucosum is a basidiomycete fungus and a member of the genus Scleroderma, or "earth balls". First described scientifically in 1791, the species has a cosmopolitan distribution, and grows in the ground in nutrient-rich, sandy soils.

Imaia is a fungal genus in the family Morchellaceae found in Japan and in the Appalachian Mountains of the US.

<i>Tuber donnagotto</i> Species of fungus

Tuber donnagotto is a species of truffle in the family Tuberaceae. Described as a new species in 2012, it is found in Croatia. The black truffle measures 2–7 cm (0.8–2.8 in) in diameter.

<i>Leucangium carthusianum</i> Species of fungus

Leucangium carthusianum is a species of ascomycete fungus. It is commonly known as the Oregon black truffle. It is found in the Pacific Northwest region of North America, where it grows in an ectomycorrhizal association with Douglas-fir. It is commercially collected, usually assisted by a specially trained truffle dog. Mature fruiting bodies can be dug up mostly during winter, but the season can extend from September through April.

References

  1. 1 2 3 4 5 6 7 8 9 Trappe MJ, Trappe JM, Bonito GM (2010). "Kalapuya brunnea gen. & sp. nov. and its relationship to the other sequestrate genera in Morchellaceae" (PDF). Mycologia. 102 (5): 1058–1065. doi:10.3852/09-232. PMID   20943505. S2CID   23305229.[ permanent dead link ]
  2. 1 2 Trappe JM, Molina R, Luoma DL, Cázares E, Pilz D, Smith JE, Castellano MA, Miller SL, Trappe MJ (2009). Diversity, Ecology, and Conservation of Truffle Fungi in Forests of the Pacific Northwest. Gen. Tech. Rep. PNW-GTR-772 (PDF) (Report). Portland, Oregon: US Department of Agriculture, Forest Service, Pacific Northwest Research Station. p. 149. Archived (PDF) from the original on 2011-10-24. Retrieved 2012-07-02.
  3. Trappe JM, Trappe M, Evans FB (2007). Field Guide to North American Truffles: Hunting, Identifying, and Enjoying the World's Most Prized Fungi. Berkeley, California: Ten Speed Press. p. 58. ISBN   978-1-58008-862-6.
  4. Campbell D. (2009). "In quest of Oregon truffles" (PDF). Mycena News . 60 (3): 4–6, 8. Archived (PDF) from the original on 2011-10-13. Retrieved 2012-07-02.