a chemical staining reaction in which the tissue, spore wall ornamentation, etc. stains reddish to reddish-brown in Melzer's reagent.

spores and hyphae are designated as dextrinoid if they turn reddish-brown upon treatment with Melzer's Iodine reagent (see amyloid, IKI-).

(Of spores, etc.) stained yellowish- or reddish-brown by Melzer's iodine. ()