Agaricus phaeolepidotus (F.H. Møller) F.H. Møller, Friesia

Mahdizadeh, Valiollah, Safaie, Naser, Goltapeh, Ebrahim Mohammadi, Asef, Mohammad Reza, Hosseini, Sayed Mohsen Nassaj & Callac, Philippe, 2016, Agaricus section Xanthodermatei in Iran, Phytotaxa 247 (3), pp. 181-196 : 191

Agaricus phaeolepidotus (F.H. Møller) F.H. Møller, Friesia 4 (3): 204 (1952)

MycoBank MB292300

Description based on the specimen IRAN 14419 F.

Macroscopic description: –– According to Asef (2014): “Pileus 50–100 mm diam., convex to broadly flat, slightly plane with age, surface dry, whitish color, densely covered with brownish fibers and scales especially towards the center. Lamellae free, crowded, pink, eventually becoming brown. Stipe 60–100 × 10–12 mm, more or less equal or with bulbous base, fairly smooth, white, bruising yellow, especially at the base, with a persistent membranous annulus, covered in conspicuous flakes below the ring. Flesh white discoloring bright yellow in the base. Taste and odor usually not distinctive or somewhat unpleasant” ( Fig. 8 ).

Microscopic description:––Basidiospores 4.5–5.7 × 3.3–4.1 μm, [5.32 ± 0.28 × 3.66 ± 0.22, Q=1.15–1.67, m=1.42 ± 0.12, n=30] μm, broadly elliptical; smooth. Basidia 11.8–16.1 × 5.5–6.9 μm, 4-spored, clavate. Cheilocystidia not very numerous, clavate, pyriform, someone pedunculate, usually simple, hyaline, smooth, 12.3–20.80 × 6.2–12 μm. Pileipellis a cutis composed of hyphae of 7.9–12.9 μm diam., cylindrical, slightly constricted at the septa ( Fig. 9 ).

Chemical reactions:–––Schaffer’s reaction unknown, KOH reaction positive ( Asef 2014).

Habit, habitat and distribution:––unknown

Specimen examined:–– IRAN, Mazandaran province, Ruyan to Baladeh, Naghiabad, on soil, 9 October 2009, leg. Asef & Torabi ( IRAN 14419 F).

Figures

FIGURE 8. Sporocarp of Agaricus phaeolepidotus from IRAN herbarium. Bar: 1cm.

FIGURE 9. Agaricus phaeolepidotus: IRAN 14419 F: A: basidiospore, B and C: Basidium (a) and cheilocystidium (b), D: Basidium, E: Cheilocystidium, F: Pileipellis, Bars: 10 μm.