Basidiomata. 1. Hygrocybe conica var. conica (A.G.S. Silva-Filho 728). 2. Hygrocybe nigrescens var. brevispora (A.G.S. Silva-Filho 890). Scale bars = 10 mm. Pictures by A.G.S. Silva-Filho. subglobose to cylindrical, smooth, thin-walled, hyaline, inamyloid, with numerous refractive granules; hilar appendix conspicuous (figure 4). Basidia 29-42 × 7.5-9 µm, clavate, to broadly clavate, tetrasporic, rarely bisporic, thin-walled, hyaline, some with refractive content mixed with some brown pigmented. Pleurocystidia and cheilocystidia absent. Pseudocystidia 31.5-42.5 × 5-8 µm, clavate with mucronate apex, cylindrical-fusoid, thin-walled, hyaline; scarce, not projecting from hymenium, found in lamellar sides and gill edges (figure 7). Lamella edge fertile. Lamellar trama regular with hyphae up to 179 µm length, 5.5-12.5 µm diam., thin-walled, smooth sometimes brown incrusted, hyaline and brown pigmented. Subhymenium with filamentous, hyphae 2-3.5 µm diam., interwoven, smooth, thinwalled, hyaline. Pileus trama with inflated hyphae 10.5-40 µm diam., parallel and horizontally arranged, smooth, thin-walled, hyaline. Pileipellis a cutis of repent hyphae, hyphae subparallel to interwoven, 4.5-7 µm diam., smooth, sometimes brown incrusted, hyaline and light brown, slightly gelatinous at center. Stipitipellis a cutis of subparallel hyphae, 2.5-7 µm diam., hyaline and brown pigmented, predominantly smooth, sometimes brown incrusted. Stipititrama regular, composed of hyphae 2.5-27.5 µm diam., smooth sometimes incrusted, hyaline and brown. Caulocystidia absent. Clamp connection present in all tissue examined. Oleiferous hyphae