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In mycology a tissue or feature is said to be amyloid if it has a positive amyloid reaction when subjected to a crude chemical test using iodine as an ingredient of either Melzer's reagent or Lugol's solution, producing a blue to blue-black staining. The term "amyloid" is derived from the Latin amyloideus ("starch-like"). [1]
Melzer's reagent can be used to test whether spores are amyloid, nonamyloid, or dextrinoid. Spores that stain bluish-gray to bluish-black are amyloid; Spores that stain brown to reddish-brown are dextrinoid; This test is normally performed on white spored mushrooms. If the spores are not light colored, a change will not be readily apparent.
To date, 37 human proteins have been found to form amyloid in pathology and be associated with well-defined diseases. [2] The International Society of Amyloidosis classifies amyloid fibrils and their associated diseases based upon associated proteins (for example ATTR is the group of diseases and associated fibrils formed by TTR). [3]
The use of microscopic features is necessary to distinguish clearly among the species: A. flavoconia has elliptic, amyloid spores, while A. frostiana has round, non-amyloid spores; A. muscaria has nonamyloid, elliptic spores. In the field, A. flavorubescens can usually be distinguished by its yellow cap color. [11]
An amyloid is any of certain insoluble fibrous protein aggregates. Amyloid may also refer to: Amyloid (mycology), a chemical reaction used in characterization of fungi; Amyloid, the Amyloid: the Journal of Protein Folding Disorders peer-reviewed scientific journal
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All Russulaceae, including the corticioid species, are characterised by spherical to elliptic basidiospores with a faint to very distinct (e.g. warty, spiny, or crested) ornamentation that stains bluish-black with Melzer's reagent (an amyloid stain reaction). [10] [30] Basidia (spore-bearing cells) are usually club-shaped and four-spored. [44]
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