“Candy cap”的意思、由来-开放百科全书

Candy cap or curry milkcap is the English-language common name for several closely related edible species of Lactarius; L. camphoratus, L. fragilis, and L. rubidus. These mushrooms are valued for their highly aromatic qualities and are used culinarily as a mere flavoring rather than as a constituent of a full meal.

Description and classification

Candy caps are small to medium-size mushrooms, with a pileus that is typically under 5 cm in diameter (though L. rubidus and L. rufulus can be slightly larger), and with coloration ranging through various burnt orange to burnt orange-red to orange-brown shades. The pileus shape ranges from broadly convex in young specimens to plane to slightly depressed in older ones; lamellae are attached to subdecurrent. The entire fruiting body is quite fragile and brittle. Like all members of Lactarius, the fruiting body exudes a latex when broken, which in these species is whitish and watery in appearance, and is often compared to whey or nonfat milk. The latex may have little flavor or may be slightly sweet, but should never taste bitter or acrid. These species are particularly distinguishable by their scent, which has been variously compared to maple syrup, camphor, curry, fenugreek, burnt sugar, Malt-O-Meal, or Maggi-Würze. This scent may be quite faint in fresh specimens, but typically becomes quite strong when the fruiting body is dried.

Microscopically, they share features typical of Lactarius, including round to slightly ovular spores with distinct amyloid ornamentation and sphaerocysts that are abundant in the pileus and stipe trama, but infrequent in the lamellar trama.^[1]

The candy caps have been placed in various infrageneric groups of Lactarius depending on the author. Bon^[2] defined the candy caps and allies as making up the subsection Camphoratini of the section Olentes. Subsection Camphoratini is defined by their similarity in color, odor (with the exception of L. rostratus – see below), and by the presence of macrocystidia on their hymenium. (The other subsection of Olentes, Serifluini, is also aromatic, but have very different aromas from the Camphoratini and are entirely lacking in cystidia.)^[3]

Bon^[2] and later European authors treated all species that were aromatic and had at least a partially epithelial pileipellis as section Olentes, whereas Hesler and Smith^[4] and later North American authors^[5] treat all species with such a pileipellis (both aromatic and non-aromatic) as the section Thojogali. However, a thorough molecular phylogenetic investigation of Lactarius has yet to be published, and older classification systems of Lactarius are generally not regarded as natural.^[3]

Like other species of Lactarius, candy caps are generally thought to be ectotrophic, with L. camphoratus having been identified in ectomycorrhizal root tips. However, unusually for a mycorrhizal species, L. rubidus is also commonly observed growing directly on decaying conifer wood.^[5] All candy cap species seem to be associated with a range of tree species.

The most notable differences between L. camphoratus, L. fragilis, and L. rubidus are as follows:^[4]

Identification

It is possible to mistake other distasteful or toxic species of mushrooms for candy caps or mistakenly include in such species in a larger collection of candy caps. Those inexperienced with mushroom identification may mistake any number of little brown mushrooms ("LBMs") for candy caps, including the deadly galerina (Galerina marginata and allies), which can occur in the same habitat. Candy caps can be distinguished from non-Lactarius species by their brittle stipe, while most other "LBMs" have a more flexible stipe. It is therefore recommended that candy caps be gathered by hand, breaking the fragile stipe in ones fingers. By this method, LBM's with a cartilaginous stipe will easily be distinguished.^[7]

Candy caps may also be confused with any of a large number of small, similarly colored species of Lactarius that may be distasteful to downright toxic depending on the species and the number consumed.

Candy caps may be distinguished from other Lactarius by the following characteristics{{Citation needed|date=January 2009}}:

Chemistry

The chemical responsible for the distinct odor of the candy cap was isolated in 2012 by chemical ecologist and natural product chemist William Wood of Humboldt State University, from collections of Lactarius rubidus. The odoriferous compound found in the fresh tissue and latex of the mushroom was found to be quabalactone III, an aromatic lactone. When the tissue and latex is dried, quabalactone III is hydrolyzed into sotolon, an even more powerfully aromatic compound, and one of the main compounds responsible for the aroma of maple syrup, as well as that of curry.^[8]

The question of what compound was responsible for the odor of candy cap had been under investigation by Wood and various students for a period of 27 years, when a mycology student in a class he was teaching asked what compound was responsible for the mushroom's odor, triggering investigation into the question. Isolation of the compound remained elusive, until solid-phase microextraction was used to extract the volatile compounds, which were then analyzed using gas chromatography–mass spectrometry.^[8]^[9]

Earlier investigation of the aromatic compounds of L. helvus by Rapor, et al. had also yielded sotolon (among a large number of other aromatic compounds), which was identified as giving this species its distinct fenugreek odor. Other important volatile compounds identified included decanoic acid and 2-methylbutyric acid.^[10]

Analysis of Lactarius camphoratus has shown that it contains 12-hydroxycaryophyllene-4,5-oxide, a caryophyllene compound. However, this was not identified as an aromatic component of this mushroom.^[11]

Culinary use

Candy caps are not typically consumed as a vegetable the way most other edible mushrooms are consumed. Because of the strongly aromatic quality of these mushrooms, they are instead used primarily as a flavoring, much the way vanilla, saffron, or truffles are used. They impart a flavor and aroma to foods that has been compared to maple syrup or curry, but with a much stronger aroma than either of these seasonings. Candy caps are unique among edible mushrooms in that they are often used in sweet and dessert foods, such as cookies and ice cream.^[17] They are also sometimes used to flavor savory dishes that are traditionally prepared with sweet accompaniments, such as pork, and are also sometimes used in place of curry seasoning.

They are usually used in dried form, as the characteristic aroma intensifies greatly upon drying. To use them as a flavoring, the dried mushrooms are either powdered or they are infused into one of the liquid ingredients used in the dish, for example, being steeped in hot milk, much the same way whole vanilla beans are.

As a result of these culinary properties, candy caps are highly sought after by many chefs. Lactarius rubidus is commercially gathered and sold in California^[12]^[13] while L. camphoratus is gathered and sold in the United Kingdom

Marchand reports that some individuals use L. camphoratus as part of a pipe tobacco mix.^[16]

Similar species

A number of species of Lactarius are distinctly aromatic, though only some of these species are thought to be closely related to the candy cap group.

The subsection Camphoratini includes Lactarius rostratus, a species found in northern Europe, though quite rare.^[3] Unlike other members of subsection Camphoratini, L. rostratus has an unpleasant (even nauseating) smell, described as resembling ivy. Lactarius cremor is a name sometimes used for mushrooms in this group, however, Heilmann-Clausen, et al.^[3] consider this name to be nomen dubium, referring variously to Lacarius rostratus, L. serifluus, or L. fulvissimus depending on the author's concept of L. cremor. Lactarius mukteswaricus and L. verbekenae, two species described from the Kumaon area of the Indian Himalaya in 2004, are reported to be very closely related to L. camphoratus and L. fragilis, respectively, including in odor.^[17]

Lactarius rufulus is reported by one source as being a "candy cap" species and having a similar odor to the other candy caps,^[7] though earlier monographs do not report such an aroma and describe the flavor as subacrid.

See also

References

1. ^Largent DL, Baroni TJ. 1988. How to Identify Mushrooms to Genus VI: Modern Genera. Arcata, CA: Mad River Press. {{ISBN|0-916422-76-3}}. p 73–74.
2. ^¹Bon M. 1983. Notes sur la systématique du genre Lactarius. Documents Mycologiques 13(50): 15–26.
3. ^¹²³Heilmann-Clausen J, Verbeken A, Vesterholt J. 1998. The Genus Lactarius. (Fungi of Northern Europe, Volume 2.) Mundelstrup, DK: Danish Mycological Society. {{ISBN|87-983581-4-6}}.
4. ^¹Hesler LR, Smith AH. 1979. North American Species of Lactarius. Ann Arbor: University of Michigan Press. {{ISBN|0-472-08440-2}}.
5. ^¹²Methven AS. 1997. The Agaricales of California 10. Russulales II: Lactarius. Eureka, CA: Mad River Press. {{ISBN|0-916422-85-2}}.
6. ^Mueller GM, Halling RE, Carranza J, Mata M, Schmit JP. 2006. Saprotrophic and ectomycorrhizal macrofungi of Costa Rican oak forests. In: M. Kappelle (ed). Ecology and conservation of neotropical montane oak forests. (Ecological Studies Series, Vol. 185). Berlin: Springer Verlag. p 55–68 (p 62). {{doi|10.1007/3-540-28909-7_5}} {{ISBN|978-3-540-28908-1}}.
7. ^¹Campbell D. 2004. The candy cap complex. {{Webarchive|url=https://web.archive.org/web/20061116043402/http://mssf.org/mnews/0403mn.pdf# |date=2006-11-16 }} Mycena News 55(3):3–4. (scroll down)
8. ^¹Wood WF, Brandes JA, Foy BD, Morgan CG, Mann TD, DeShazer DA. 2012. The maple syrup odour of the “candy cap” mushroom, Lactarius fragilis var. rubidus. Biochemical Systematics and Ecology 43:51-53. {{DOI|10.1016/j.bse.2012.02.027}}.
9. ^Humboldt State University. 2012. Student question about mushroom’s maple syrup odor takes 27 years to answer. Humboldt State Now (website). May 04, 2012.
10. ^Rapior S, Fons F, Bessiere J-M. 2000. The fenugreek odor of Lactarius helvus. Mycologia 92(2): 305–308. {{DOI|10.2307/3761565}}.
11. ^Daniewski WM, Grieco PA, Huffman JC, Rymkiewicz A, Wawrzun, A. 1981. Isolation of 12-hydroxycaryophyllene-4,5-oxide, a sesquiterpene from Lactarius camphoratus. Phytochemistry. 20(12):2733–4. {{DOI|10.1016/0031-9422(81)85276-4}}.
12. ^¹Treviño L. 2004 Jan 9. "Candy Caps let people flavor foods — with fungus: Mushrooms are in cookies and ice cream". San Francisco Chronicle.
13. ^Jung C. 2004 Jan 28. [https://web.archive.org/web/20041126074009/http://www.mercurynews.com/mld/mercurynews/living/food/7811175.htm "The rare fungus that can satisfy your sweet tooth"]. San Jose Mercury. (Archived at Wayback Machine),
14. ^Kirby T. 2006 Sep 27. "The British fascination with fungi: The magic of the curry mushroom" {{Webarchive|url=https://web.archive.org/web/20070324214404/http://news.independent.co.uk/uk/this_britain/article1761668.ece# |date=2007-03-24 }}. The Independent.
15. ^Wang X-H. 2000. (A taxonomic study on some commercial species in the genus Lactarius (Agaricales) From Yunnan Province, China.{{Dead link|date=November 2018 |bot=InternetArchiveBot |fix-attempted=yes }}) Acta Botanica Yunnanica 22(4):419–427. (Article in Chinese. English abstract {{Webarchive|url=https://web.archive.org/web/20070929124536/http://journal.kib.ac.cn/qikan/epaper/zhaiyao.asp?bsid=969# |date=2007-09-29 }}.)
16. ^Marchand A. 1980. Champignons du Nord et du Midi 6: Lactaires et Pholiotes. Perpignan, FR: Diffusion Hachette. {{ISBN|2-903940-03-7}}.
17. ^Das K, Sharma, JR, Montoya L. 2004. Lactarius (Russulaceae) in Kumaon Himalaya 1: New species of subgenus Russularia. Fungal Diversity 16:23–33. (Abstract.)
18. ^Phillips R. 2006. Lactarius aquifluus. {{Webarchive|url=https://web.archive.org/web/20061022114230/http://www.rogersmushrooms.com/gallery/DisplayBlock~bid~6091~gid~.asp# |date=2006-10-22 }} Roger's Mushrooms (website). Accessed 2008 Feb 11.
19. ^Russulales News Team. 2007. Lactarius glyciosmus. Russulales News (website). Accessed 2008 Feb 11.
20. ^Milliken W, Bridgewater S. nd. Scottish plant uses: Lactarius glyciosmus. Flora Celtica online database, Royal Botanic Garden, Edinburgh. Accessed 2008 Feb 11.