Agaricus matrum

Agaricus matrum L.A. Parra, A. Caball., S. Serrano, E. Fern. & Callac, Fungi Europaei 1A: 571. 2013.

MycoBank MB8055368


AUTHORS: Ballester, L. & Parra, L.
Taxonomic Classification

phy Basidiomycota

sbp Agaricomycotina

cls Agaricomycetes

sbc Agaricomycetidae

ord Agaricales

fam Agaricaceae

gen Agaricus

sp Agaricus matrum


Pileus 2.5-4 cm in diameter, initially globose, later convex with a flat center, and finally flat with a slightly noticeable umbo, white in color, which turns with time, friction, or exposure to sun or wind to ochraceous. Pileus surface is fibrillose, smooth, and matte, slightly yellowing upon rubbing. Margin is thin, slightly exceeding, sometimes with appendiculate remnants of the annulus. Lamellae up to 6 mm in height, free, crowded, with lamellulae in between, initially whitish, later pinkish-gray, and finally dark brown, almost black, with a paler edge. Stipe 4-5 x 0.5-0.8 cm, clavate or with a bulbous base up to 1 cm, with a superior annulus, white, smooth above the annulus and fibrillose below, turning intensely yellow with time or upon rubbing, mainly towards the base, which eventually takes on ochraceous-yellowish tones and is provided with fine mycelial cords. Annulus is simple, superior, thin, fragile, and whitish. Context when cut is initially white, brown on the pileus and the upper part of the stipe, turning yellow-orange with time in the lower part of the stipe. Anise-like odor, sweet taste.

Spores 4.6-5.54-6.4 x 3.1-3.54-3.9 μm, Q=1.3-1.57-1.8, n=40, ellipsoid, brown, without a pore, not guttulate. Basidia tetrasporic, 16-18 x 7-8 μm, with sterigmata up to 3 μm long, clavate. Cheilocystidia are hyaline, abundant, generally simple, rarely septate at the base, clavate, 20-30 x 6-9 μm. Pleurocystidia not observed. Pileipellis composed of cylindrical hyphae 4-8 μm in thickness, septate, narrowing at the septa. Terminal elements are 3-4 μm wide, with rounded apices.

Species References in the Territory
  • PARRA, L.A. (2013) Agaricus L. Allopsalliota Nauta & Bas. Fungi Europaei 1A. Canduso Edizioni s.a.s. Alessio. [Lo, O]
Cited Collection:

A group of 10 fruiting bodies, with some specimens attached at the base. In an Quercus ilex forest, on acidic soil. Añón de Moncayo (Zaragoza), 14-XI-2018, 41.764633 -1.731261, alt. 895 m., leg. R. Mairal & L. Ballester, LB18111402.

Specimens in Scientific Collections

* sequenced material

LAPAG: Luis A. Parra’s private herbarium; AH: University of Alcalá herbarium; LB: Luis Ballester’s private herbarium.

Reference specimen marked in bold


Lo: AH44506* (Holotype), LAPAG 817* (isotype), LAPAG916*.

O: LAPAG855*

Z: LB18111402*.

Sequences in Public Databases and Obtained from Territory Material

LB18111402 : OQ656153 (ITS)

LAPAG817: KT951534 (RPB2); KT951614 (TEF-1); KT951314 (ITS)

LAPAG855: KT951533 (RPB2); KT951598 (TEF-1); KT951443 (LSU); KT951310 (ITS)

LAPAG916: KX198057 (TEF-1); KX083990 (LSU); KU975080 (ITS)

AH44506: KX198058 (TEF-1); KX083991 (LSU); KF447896 (ITS)


Agaricus matrum. Fruiting bodies in situ. Photograph: L. Ballester[/caption>















How to cite this record:

Ballester L. & Parra L.A. 2023. Agaricus matrum L.A. Parra, A. Caball., S. Serrano, E. Fern. & Callac. SIMsheets 38 (Updated on 13-VI-2023). DOI:
Available at: