Amanita aureofloccosa Bas, Persoonia

Liu, Yuan S., Kumla, Jaturong, Suwannarach, Nakarin, Sysouphanthong, Phongeun & Lumyong, Saisamorn, 2022, Three species of Amanita section Lepidella (Amanitaceae, Agaricales) from northern Thailand, Phytotaxa 570 (1), pp. 16-28 : 23-24

publication ID

https://doi.org/ 10.11646/phytotaxa.570.1.2

DOI

https://doi.org/10.5281/zenodo.7530337

persistent identifier

https://treatment.plazi.org/id/03D2031B-FFAF-CC5C-D385-32FCFE0BDD13

treatment provided by

Plazi

scientific name

Amanita aureofloccosa Bas, Persoonia
status

 

Amanita aureofloccosa Bas, Persoonia View in CoL View at ENA 5: 384 (1969). Figure 1c View FIGURE 1 and 4 View FIGURE 4

Basionym: Lepiota aurea Beeli View in CoL , Bull. Soc. Roy. Bot. Belg. 59: 105. 1927; non Amanita aurea (Beeli) E. J. Gilbert, Iconogr. Mycol. View in CoL 27: 205. 1941 (= Amanitopsis aurea Beeli, Bull. Soc. Roy. Bot. Belg. View in CoL 63: 108. 1931).

Basidiomata large. Pileus 10.5–13.9 cm diam., plano-convex to applanate at maturity; volval remnants on pileus fibrillose to floccose or somewhat pulverulent, vivid yellow (3A8) to yellow (3B8), densely arranged on the disk; margin non-striate, appendiculate; context white (1A1), unchanging. Lamellae free, crowded, white (1A1); lamellulae attenuate with some subtruncate. Stipe 16.2–24.5× 1.8–2.1 cm, cylindrical and slightly tapering upwards, covered by vivid yellow (3A8) to yellow (3B8), floccose and somewhat pulverulent scales; context fistulose, white (1A1); basal part slightly inflated, fibrillose to floccose, light yellow (1A5) to vivid yellow (3A8) volval remnants. Annulus apical, fragile, sub-membranous, vivid yellow (3A8) to yellow (3B8). Odor not recorded.

Lamellar trama bilateral. Mediostratum 10–15 μm wide, composed of abundant sub-cylindrical inflated cells (40–62 × 8–15 μm); filamentous hyphae abundant to dominant, 1–10 μm wide; vascular hyphae scarce. Lateral stratum 15–23 μm wide, composed of abundant clavate to sub-cylindrical inflated cells (20–53 × 8–15 μm), diverging at an angle of ca. 30° to 45° to mediostratum; filamentous hyphae abundant, 2–7 μm wide. Subhymenium 15–25 μm thick, with 1–3 layers of subglobose, or irregular cells, 6–12 × 5–11 μm. Basidia ( Figure 4b View FIGURE 4 ) 33–53 × 11–15 μm, clavate, 4-spored; sterigmata up to 3–4 μm long; basal septa lacking clamps. Basidiospores ( Figure 4a View FIGURE 4 ) [50/2/2] (8) 8.5–10 (10.5) × 7–9 (9.5) μm, avl X avw = 9.1 × 8.4 μm, Q = 1.0–1.19 (1.29) μm, Qm = 1.09 ± 0.07, globose to subglobose, sometimes broadly ellipsoid, amyloid, colorless, guttulate, thin-walled, smooth; apiculus small. Pileipellis composed of radial, thin-walled, yellowish white, filamentous hyphae 3–18 μm wide; vascular hyphae scarce. Volval remnants on pileus ( Figure 4c View FIGURE 4 ) composed of yellowish white, interwoven to repent arranged elements: filamentous hyphae fairly abundant, 2–9 μm wide, thin-walled, branching, anastomosing; inflated cells very abundant to dominant, slenderly clavate to fusiform, 18–165 × 10–40 μm, thin-walled; vascular hyphae scarce. Volval remnants on stipe base is semblable with the structure of volval remnants on pileus, filamentous hyphae scattered, 4–6 μm wide, thin-walled, branching, anastomosing; inflated cells very abundant to dominant, ellipsoid, clavate to sub-cylindrical, 23–200 × 18–35 μm, thin-walled; vascular hyphae scarce. Stipe trama composed of longitudinally arranged, filamentous hyphae, 5–15 μm wide; vascular hyphae scarce. Clamps absent in all parts of basidiomata..

Habitat: Solitary to scattered on soil in subtropical semi-deciduous seasonal forest, tropical deciduous forest, and on the ground along a road, in slightly sun-exposed areas, April to September.

Distribution: This species is currently known in Brazil ( Wartchow et al. 2015), Colombia ( Palacio et al. 2015), Ghana ( Pegler 1968; Wartchow et al. 2015), the Southern Democratic Republic of the Congo ( Bas 1969), and Thailand (this study).

Specimens examined: THAILAND. Chiang Rai Province: Mueang District, N 20°02’29’’, E 99°49’47’’, alt. 435 m, 22 Jun 2020, Phongeun Sysouphanthong , PS-2020-38 (SDBR-STO-2020-PS38, GenBank accession no.: nrLSU = OM 980704 View Materials , ITS = ON000811 View Materials , RPB2 = ON007281 View Materials , and TEF1 About TEF -α = ON007299 View Materials ); GoogleMaps Phongeun Sysouphanthong, PS-2020- 39 (SDBR-STO-2020-PS39, GenBank accession No.: nrLSU = OM 980705 View Materials , ITS = ON000812 View Materials , RPB2 = ON007282 View Materials , and TEF1 About TEF -α = ON007300 View Materials ); GoogleMaps Chiang Mai Province: Mueang District , N 18°47’48’’, E 98°57’11’’, alt. 334 m, 11 Jun 2021, J. Kumla & N. Suwannarach, NK1470 (SDBR-CMUNK1470, GenBank accession no.: ITS = ON695871 View Materials ) GoogleMaps .

Remarks: Morphologically, Amanita aureofloccosa is unique among congeners by having a pulverulent, bright orange-yellow volva remnant on its pileus, a slender stipe covered by orange-yellow floccose scales, a globose to subglobose, amyloid basidiospore and the lacking clamps in all parts of basidiomata. According to the original literature ( Bas 1969), the basidiospores size of A. aureofloccosa was described as 7–8.5 × 6.5–8.5 μm, but Wartcow et al. (2015) re-examined the lectotype (BR2229) and additional material from Ghana (K173243), and amended the basidiospores size to (6.5–) 6.8–10.5 (–10.8) × (6.5–) 6.8–10.2 (–10.5) μm, of which the results are similar to Thai material. Significantly, compared to the materials from other countries, our collections from Thailand have larger basidiomata and basidia.

OM

Otago Museum

Kingdom

Fungi

Phylum

Basidiomycota

Class

Agaricomycetes

Order

Agaricales

Family

Amanitaceae

Genus

Amanita

Loc

Amanita aureofloccosa Bas, Persoonia

Liu, Yuan S., Kumla, Jaturong, Suwannarach, Nakarin, Sysouphanthong, Phongeun & Lumyong, Saisamorn 2022
2022
Loc

Amanitopsis aurea Beeli, Bull. Soc. Roy. Bot. Belg.

Beeli 1931: 108
1931
Loc

Lepiota aurea Beeli

Beeli 1927: 105
1927
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