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Six compounds, 5-(1-hydroxyethyl)dihydrofuran-2(3H)-one (1), 4-ethoxy-4-oxobutanoic acid (2), 4ketononanoic acid (3), methyl(2-acetylaminoethyl)sulfoxide (4), methyl benzoate (5) and p-hydroxybenzoic acid (6) were isolated from the fruiting bodies of Cortinarius caperatus. Compounds 1, 3, 5, and 6 inhibited growth of Flammulina velutipes mycelia. Compounds 2, 3, 5, and 6 exhibited growth regulatory activities toward rice seedlings, while compounds 3, 5, and 6 regulated the growth of lettuce. Compound 4 was first isolated from a natural source. In addition, the activity of compound 6 against rice was compared with those of its analogs.

Three novel compounds, erinachromanes A and B (1, 2) and erinaphenol A (3), along with eight known compounds (4−11), were isolated from the culture broth of Hericium erinaceus. The structures of 1−3 were determined by the interpretation of spectroscopic data. Although compounds 4 and 9 had been synthesized, they were isolated from a natural source for the first time. In the bioassay examining plant-growth regulatory activity, all of the compounds suppressed the growth of lettuce.