Agaricus aurantifibrillosus P. H. Liu & S. E. Wang, 2025
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publication ID |
https://doi.org/10.3897/mycokeys.119.154278 |
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DOI |
https://doi.org/10.5281/zenodo.15740436 |
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persistent identifier |
https://treatment.plazi.org/id/E376667B-C689-5DE7-95D9-EF79C43A28CC |
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treatment provided by |
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scientific name |
Agaricus aurantifibrillosus P. H. Liu & S. E. Wang |
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sp. nov. |
Agaricus aurantifibrillosus P. H. Liu & S. E. Wang sp. nov.
Figs 2 A, B View Figure 2 , 3 View Figure 3
Etymology.
aurantifibrillosus (Latin), referring to the pileus covered with arranged orange (5 A 8) or brownish yellow (5 C 8) fibrillose squamules.
Holotypus.
China • Fujian Province, Fuzhou City, Fuzhou National Forest Park , 2 October 2024, 26°10'41"N, 119°16'19"E, alt. 280 m, Shi-En Wang, E 2410232 ( FFAAS 3390 ) GoogleMaps .
Diagnosis.
This species is characterized by its pileus covered with orange (5 A 8) or brownish yellow (5 C 8) scattered fibrillose squamules, elongate basidiospores (Qav = 1.70), and abundant cheilocystidia.
Description.
Pileus 3.6–6.2 cm in diameter, 0.2–0.3 cm thick at the center, truncate conical to plane, surface dry, white (5 A 1) or orange white (5 A 2), covered with scattered arranged orange (5 A 8), brownish yellow (5 C 8) fibrillose squamules, denser at disc, showing brownish orange (6 C 8) or brown (6 E 8), margin appendiculate by annulus remnants. Context of the pileus white (6 A 1), with no special odor. Lamellae 0.2–0.4 cm broad, pastel red (9 A 4) then reddish brown (8 E 8) later brownish black (8 F 8), free, crowded, intercalated with numerous lamellulae. Stipe 5.6–8.6 × 0.4–1.3 cm, hollow, clavate, with white (6 A 1) rhizomorphs, provided with an annulus in its upper third, above the annulus white (6 A 1), below the annulus with white (6 A 1), orange (5 A 8) floccose squamules, becoming dark yellow (4 C 8) on touching or bruising. Annulus superior, white (6 A 1), simple, membranous, easy falling out.
Basidiospores (4.6) 4.7–5.7 (5.9) × (2.7) 2.8–3.3 (3.6) μm, [Xav = 5.2 × 3.1 μm], Q = 1.50–1.93, Qav = 1.70, ellipsoid to elongate-ellipsoid, smooth, thick-walled, brown, guttulate. Basidia 14–18 × 5–7 μm, clavate, 4 (2) - spored, sterigmata 2–4 µm long. Cheilocystidia abundant, nearly globose, oblong, sphaeropedunculate, or broadly clavate, 12–34 × 10–20 μm, with pale yellowish intracellular pigment. Pleurocystidia absent. Pileipellis a cutis of cylindrical, slightly constricted at the septa, pale yellowish hyphae, 4–9 μm in diameter.
Habitat and distribution.
Gregarious or scattered in broad-leaved and bamboo forests during autumn. Currently, it has only been documented in Fujian Province, China.
Additional specimens measured.
China • Fujian Province, Fuzhou City, Fujian Agriculture and Forestry University , 5 October 2024, Shi-En Wang, E 2410524 ( FFAAS 3391 ) and E 2410525 ( FFAAS 3392 ) .
Notes.
Agaricus aurantifibrillosus belongs to A. (subg. Minores ) sect. Minores. Agaricus aurantipileatus T. Bau & S. E. Wang in A. sect. Arvenses shares morphological similarities with A. aurantifibrillosus . However, A. aurantipileatus can be distinguished by its double annulus, smaller spore Q value (Q = 1.17–1.36), and sometimes catenulate cheilocystidia ( Wang and Bau 2024).
In the multi-locus phylogenetic tree (Fig. 1 View Figure 1 ), A. aurantifibrillosus clusters with A. colpeteii T. Lebel and A. wayanadensis , albeit with low statistical support, and this may be due to the lack of sequences in the related taxa. Agaricus colpeteii is a gasteroid Agaricus species with basidia not observed ( Lebel 2013). Agaricus wayanadensis differs in having a pileus surface covered with brown squamules and a smaller spore Qav value (Qav = 1.58) ( Arya and Pradeep 2024).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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