Boletales » Boletaceae » Longistriata

Longistriata flava

Longistriata flava Sulzbacher, Orihara, Grebenc, M.P. Martín & Baseia, in Sulzbacher, et al., MycoKeys 62: 60 (2020)

Etymology: Flavus (Latin), refers to the yellow peridium of the species.

Diagnosis: Basidiomata hypogeous to subhypogeous, 11–24 mm wide, 13–16 mm high; subglobose, depressed subglobose to oblong in older stages, with small folds at the base; with a short stipe. Peridium <0.8 mm thick, at younger stages yellow (2A6) to light yellow (1A5) then yellowish brown (5D8) to brownish yellow (5C8) at maturity; smooth and glabrous, sometimes finely fibrillose. Sterile base present, short, 6–8 × 3–4 mm, clavate with a bulbous slightly developed base; color vivid yellow (3A8), brownish yellow (5C8) when bruised; surface glabrous, with small folds and depressions; the inner part is full, subgelatinous and yellowish brown (5D8); connected by scattered and short, thin (0.3–0.5 mm diam), orange (6B8) rhizomorphs. Gleba loculate, non-gelatinized to gelatinized, with irregular locules (0.5–1 mm diam); white (1A1) at younger stages, to finally yellowish brown (5F4) at maturity, immediately turning deep green (30F7) to black when cut in older basidiomata.

Peridium 100–200 μm thick, composed by a cutis of interwoven hyphae and immersed in a gelatinized matrix, 2–6 μm diam., with rounded, thin-walled, smooth, terminal hyphae, not readily separable from gleba. Hymenophoral trama formed by parallel to subparallel, smooth and thin-walled, hyaline hyphae, inamyloid, gelatinized in the central part, 3–6 μm diam. Subhymenium ramose, 46–72 μm deep, hyphae 10–16 × 2–5 μm diam. Hymenial cystidia 38–78.5 × 10–14 μm, lageniform or ventricose, with rounded apex, thin-walled, hyaline, inamyloid. Basidia 25–48 × 10–15 μm, clavate, 2 and 4-spored (sterigmata up to 3 μm long.), hyaline. Basidioles 31–46 × 7–12 μm, clavate with rounded apex. Basidiospores [30/2/2] 15–19 (–20) × 13–16 (–17) μm (ornamentation included), [L = 17.7 μm, W = 14.7 μm, Q = 1.10–1.40 (–1.50), Qm = 1.20], broadly ellipsoid, sterigmal attachment persistent at maturity, up to 3 μm long; hyaline when young to finally light brown at maturity in 3% KOH, dextrinoid in Melzer’s reagent; walls ornamented (< 2.5 μm width); with a series of thinner longitudinal ridges, in average > 10 complete ridges across the longitudinal axis of the spore with additional irregular, thin and low ridges that are sometimes bifurcated or fused together; under a scanning electron microscope the surface is clearly longitudinally striated.

Index Fungorum Number: IF816323


Figure 1. A nLSU + TEF1 combined Maximum likelihood (ML) phylogram showing the phylogenetic relationship of Longistriata (UFRN-Fungus 1756, holotype) in relation to representative taxa in the Boletaceae. Non-parametric bootstrap branch supports (MPbs / MLbs) are given for nodes with bs>50