Pseudosperma cupreum G.B. Galeotti, A. Rubini, Para, C. Riccioni, B. Belfiori., 2025
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publication ID |
https://doi.org/10.11646/phytotaxa.693.2.1 |
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persistent identifier |
https://treatment.plazi.org/id/03B34855-FF84-FFE1-FF67-FD80FE05BAD4 |
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treatment provided by |
Felipe |
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scientific name |
Pseudosperma cupreum G.B. Galeotti, A. Rubini, Para, C. Riccioni, B. Belfiori. |
| status |
sp. nov. |
Pseudosperma cupreum G.B. Galeotti, A. Rubini, Para, C. Riccioni, B. Belfiori. sp. nov. ( Figs. 2–4 View FIGURE 2 View FIGURE 3 View FIGURE 4 ).
MycoBank no.: MB856531
Holotype:—Italy. Umbria (Central Italy), Spada Lakes Natural Park GPS coordinates: 43°25’28.5” N 12°14’25.9” E, elev. 288 m, on sandy soil riparian environment dominated by Populus alba ., Salix sp. and Alnus glutinosa , 29 October 2023, Galeotti G. B. (holotype PERU! m-4475, isotype GDOR! 5768). GenBank: PQ563301 ( ITS), PQ563295 ( LSU), PQ561215 (rpb2).
Etymology: —The term “ cupreum ” is derived from Latin cuprum (copper), meaning “copper-like” or “of the color of copper.”
Diagnosis: — Pseudosperma cupreum differs from other members of the genus Pseudosperma by the combination of the following macroscopic characters: yellow-ochre-coloured pileus with a reddish-copper centre, absence of a velipellis, stipe ranging from clavate to bulbous, weak aromatic odour with spermatic component.It is also characterized for its growth under Populus sp. , Salix sp. and Alnus sp. Additionally, the ITS sequence shows more than 3% of genetic distance from those of phylogenetically related species such as P. umbrinellum and P. quercinum .
Description: — Pileus 20–40 mm wide, slightly fleshy, initially conical-campanulate, later flattening with a prominent umbo; margin regular and involute, sometimes becoming revolute in mature specimens. Cuticle rimose, fibrillose, dry, longitudinally cracked, without any veil remnants. Background color ochraceous to light yellow, with reddish-copper tones in the center from which filiform strands of the same color radiate towards the margin. Hymenophore with lamellae spaced, adnate to uncinate, narrow, thin and irregular, with lamellulae of varying sizes, initially whitish, then ochre, with olivaceous hues and rust-coloured spots, finally brown at maturity. The lamellar edge is wavy, finely eroded, sterile and paler than the lamellar face. Spore print brown-ochre. Stipe 40–60 mm long, central, cylindrical, sometimes curved, white and pruinose at the apex, with ochraceous-fulvous tints near the base and when bruised. The base is clavate to distinctly bulbous. Context fibrous and whitish in the stipe, fragile in the cap. Odour faint aromatic with a spermatic component.
Basidiospores (9.1) 9.7–11.3 (12.6) × (5.2) 5.5–6.3 (6.9) µm, L × W = 10.5 × 5.9 µm, Q = (1.5) 1.6–2.0 (2.2), Qm = 1.8, (n = 123), smooth and asymmetrical, ellipsoid in frontal view and amygdaliform in lateral view, occasionally ovoid and phaseoliform, with a slight supra-hilar depression, monoguttulate, and with an apiculus measuring 0.5–0.75 µm, visible in lateral view. Basidia (25.5) 27.0–33.9 (35.3) × (7.2) 8.1–11.1 (11.5) µm, L×W = 29.9 × 9.6 µm, (n = 32), predominantly tetrasporic, clavate, and multiguttulate. Cheilocystidia (15.5) 28.5–43.7 (52.0) × (3.8) 7.6–11.1 (13.5) µm, L × W = 35.6 × 9.1 µm, (n = 64), predominantly clavate, but also cylindrical with an obtuse or attenuated apex, occasionally branching. Pleurocystidia absent. Stipitipellis (22.5) 32.1–53.8 (75.4) × (5.3) 7.4–10.9 (13.1) µm, composed of parallel, cylindrical hyphae. Caulocystidia (22.5) 32.1–53.8 (75.4) × (5.3) 7.4–10.9 (13.1) µm, L × W = 42.5 × 9.1 µm, (n = 38), observed only at the stipe apex, highly variable, cylindrical, clavate, subcapitate, sometimes lanceolate or chain-like. Pileipellis (63.8) 66.6–116.3 (132.7) × (2.9) 3.1–6.25 (6.3) µm, L × W = 94.3 × 4.9 µm, (n = 22), formed by parallel hyphae (a cutis structure), with the subpellis composed of thicker and slightly swollen hyphae, showing conspicuous wall pigments and fine encrustation. Clamp connections present in all tissues observed, particularly at the base of the initial segments of caulocystidia and cheilocystidia.
Additional specimen examined: — Italy. Spada Lakes Natural Park, Umbria (Central Italy), elev. 288 m, 05 November 2023, Galeotti G. B. ( PERU! m-4476) ; 04 November 2023, Galeotti G. B. ( PERU! m-4477) ; 23 June 2024, Galeotti G. B. ( PERU! m-4478) .
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