Boletales » Paxillaceae » Paralpova

Paralpova artikutzensis

Paralpova artikutzensis Cabero, D. Moreno-Mateos & P. Alvarado 2020, in Alvarado et al., Mycologia, 113(4), 828-841 (2020)

Etymology: artikutzensis, from Artikutza (Navarre, Spain), the place where this species was first found.

Diagnosis: Medium-sized sequestrate hypogeous basidiomata with an intense pleasant fruity smell (sometimes even after drying), gleba yellowish, two-layered peridium with a prosenchymatic peridiopellis about 200 μm thick, basidiospores 17.5 × 10 μm on average. Associated with Fagus sylvatica.

Basidiomata (Figures 3AC) 1328 mm wide; hypogeous (often found 34 cm deep); compact; first subglobose and then lobed, with a small basal depression; surface smooth, matt or dull yellowish brown. Intense pleasant fruity odor, recalling that of mandarin orange. Peridium thin, not detachable; concolor with the surface or slightly darkened. Glebal chambers about 1.82.8 × 2.53.7 mm; filled with dark brown or blackish gel; more or less symmetric but lacking a well-delimited perimeter. Trama yellowish. Peridium (FIG. 3DE) 0.70.8 mm thick; with two layers: (i) peridiopellis 230 μm thick, prosenchymatic, made of entangled hyphae arranged more or less parallel to the surface, irregularly cylindrical, septate, bifurcate, with brownish yellow parietal content, about 2.53.5 μm diam, without clamp connections, and of rugose or granulose, thin-walled, short cells with inflated or clavate tips growing on the surface, and (ii) subpellis 570 μm thick, pseudoparenchymatic, formed of subglobose and angular elements, as well as irregularly cylindrical hyphae with parietal yellowish pigments. Trama made of polygonal and subglobose elements measuring 13.017.5 × 30.540.5 μm, with occasional irregularly cylindrical septate hyphae with parietal brownish yellow pigments. Hymenium densely packed but lacking a palisade organization, with septate and bifurcate hyphae bearing basidia that are soon collapsing. Basidia (Figure 3F) 710 × 2.53.0 μm; hyaline, with granulose content; subcylindrical or slightly claviform; mostly monosporic (but rarely also bisporic); rarely visible because of autolysis, with sterigmata measuring about 23 μm and presenting a concave tip. Basidiospores (Figures 3G-H) (13.5–)1519.5(–22) × (8–)8.510.5(–12) μm, 17.5 × 9.5 μm on average (n = 85), Qm = 1.82 ± 0.2; statismosporic, orthotropic and multiguttulate; ellipsoid to claviform, fusiform, sinuose, inflated or asymmetrical; smooth; with a rounded (rarely papillate) apex and a slightly truncate base; sometimes with small hyaline remnants of sterigmata; brownish yellow with an intensely colored wall about 11.5 μm thick. Cystidia not seen. Clamp connections not seen.

Index Fungorum Number: IF833077

Figure 1. Bayesian inference phylogram of combined ITS, 28S, and RPB2 nucleotide sequence data for the family Paxillaceae, rooted with Boletus edulis (outgroup). Nodes were annotated if supported by >0.95 Bayesian PP (left) or >70% ML BP (right). Boldface names represent samples sequenced for this study. The dashed branch was shortened for graphic presentation.