Ecology

Associations

In Great Britain and/or Ireland:
Fungus / parasite
fruitbody of Asterophora lycoperdoides parasitises decayed fruitbody of Russula
Remarks: season: summer-autumn

Fungus / parasite
fruitbody of Asterophora parasitica parasitises moribund fruitbody of Russula

Fungus / saprobe
fruitbody of Collybia cirrhata is saprobic on decaying basidiome of Russula

Fungus / saprobe
sclerotium of Collybia cookei is saprobic on decaying basidiome of Russula

Fungus / saprobe
sclerotium of Collybia tuberosa is saprobic on decaying basidiome of Russula

Fungus / parasite
Verticillium anamorph of Hypomyces ochraceus parasitises fruitbody of Russula

Fungus / associate
larva of Mydaea humeralis is associated with Russula

Fungus / feeder
Sciurus carolinensis feeds on fruitbody of Russula
Other: minor host/prey

Fungus / parasite
sporangium of Syzygites megalocarpus parasitises fruitbody of Russula

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
                                        
Specimen Records:989Public Records:544
Specimens with Sequences:894Public Species:188
Specimens with Barcodes:856Public BINs:0
Species:360         
Species With Barcodes:328         
          
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Barcode data

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Locations of barcode samples

Collection Sites: world map showing specimen collection locations for Russula

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Wikipedia

Russula

Around 750 worldwide species of mycorrhizal mushrooms compose the genus Russula. They are typically common, fairly large, and brightly colored – making them one of the most recognizable genera among mycologists and mushroom collectors. Their distinguishing characteristics include a white to dark yellow spore print, brittle free white gills, and an absence of partial veil or volva tissue on the stem. Members of the related Lactarius genus have similar characteristics but emit a milky latex when their gills are broken. The genus was described by Christian Hendrik Persoon in 1796.

Russula means reddish.

Identification[edit]

"If we know of any one, who in the pride of intellect spurned all mental tasks as mere play, we would tame him by insisting on his mastering, classifying and explaining the synonyms of the genus Russula."

Like the genus Lactarius, russulas have a distinctive flesh consistency, which is also reflected in the appearance of the gills and stipe, and normally makes them immediately recognizable. They have no trace of a veil (no ring, or veil remnants on the cap). The gills are brittle except in a few cases, and cannot be bent parallel with the cap without breaking. Hence the genus Russula sometimes known as 'brittle gills'. They have splitting gills and do not exude a milky substance at cut surfaces, contrary to the genus Lactarius. Presence of large spherical cells, 'sphaerocysts'in stipe is an important characteristic feature to distinguish the members of Russulaceae from other mushroom. In Russula stipe breaks like the flesh of an apple, whilst in most other families it only breaks into fibres. [1] The spore powder varies from white to cream, or even orange.

While it is relatively easy to identify a sample mushroom as belonging to this genus, it is a significant challenge to distinguish member species of Russula. This task often requires microscopic characteristics, and subtle subjective distinctions, such as the difference between a mild to bitter and a mild to acrid flavor. Moreover the exact phylogenetic relationships of these mushrooms have yet to be resolved in the professional mycological community, and may ultimately depend on DNA sequencing analysis.

The following characteristics are often important in identifying individual species:

  • the exact colour of the spore powder (white/cream/ochre),
  • the taste (mild/bitter/acrid),
  • colour changes in the flesh,
  • the distance from the centre to which the cap skin can be pulled off: (peeling percentage).
  • cap colour (but this is often very variable within one species),
  • reaction of the flesh to ferrous sulphate (FeSO4), formalin, alkalis, and other chemicals,
  • ornamentation of the spores, and
  • other microscopic characteristics, such as the appearance of the cystidia in various mounting reagents.

Despite the difficulty in positively identifying collected specimens, the possibility to spot the toxic species by their acrid taste makes some of the mild species, such as R. cyanoxantha and R. vesca, popular edible mushrooms. As far as is known, no species of Russula is deadly poisonous and mild-tasting ones are all edible.[2] Note that this rule applies only to Russulas and not to other types of mushrooms.[3]

Toxicity[edit]

The main pattern of toxicity seen among Russula species to date has been gastrointestinal symptoms in those with a bitter taste when eaten raw or undercooked; many of these are red-capped species such as R. emetica, R. sardonia and R. nobilis. However, rhabdomyolysis was seen after consumption of R. subnigricans in Taiwan. Several active agents have been isolated; one designated russuphelin A by researchers in Japan.[4]

Species[edit]

R. chloroides
For more examples, see the List of Russula species.

See also[edit]

References[edit]

[1]

  1. ^ a b Mohanan C. (2011). Macrofungi of Kerala. Kerala, India: Kerala Forest Research Institute. pp. 597 \isbn=81–85041–73–3. 
  2. ^ See "Russulales News", "Edibility and toxicity of Russulales" page, "5.1.2. Edible Russulae" section.
  3. ^ http://www.mtsn.tn.it/russulales-news/pdf/macro_form.pdf
  4. ^ Takahashi A, Agatsuma T, Matsuda M, Ohta T, Nunozawa T, Endo T, Nozoe S (1992). "Russuphelin A, a new cytotoxic substance from the mushroom Russula subnigricans Hongo.". Chem Pharm Bull (Tokyo). 40 (12): 3185–88. PMID 1294320. 


  • Arora, D. (1986). Mushrooms demystified: A comprehensive guide to the fleshy fungi, Berkeley: Ten Speed Press. pp. 83–103.
  • Kibby, G. & Fatto, R. (1990). Keys to the species of Russula in northeastern North America, Somerville, NJ: Kibby-Fatto Enterprises. 70 pp.
  • Weber, N. S. & Smith, A. H. (1985). A field guide to southern mushrooms, Ann Arbor: U Michigan P. 280 pp.
  • Moser, M. (1978) Basidiomycetes II: Röhrlinge und Blätterpilze, Gustav Fischer Verlag Stuttgart. English edition: Keys to Agarics and Boleti... published by Roger Phillips, London.
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