Pleurotus djamor
Pleurotus djamor (Rumph. ex Fr.) Boedijn
Index Fungorum number: IF 355683, Faces of Fungi: FoF 09651.
Pileus 30-70 mm diam., rounded flabelliform to reniform; surface glabrous, pink, pinkish, white to pale red (7A3) at the center then pastel red to reddish orange (7A5-8) toward the margin, the entire surface turning paler to white or whitish with age; margin inflexed to straight, wavy and split when mature. Lamellae decurrent, narrow, 3-5 mm wide, moderately crowded, with more than 5 lamellulae lengths, pink, pale red to pastel red (7A3-5), slightly paler near stipe, with smooth, concolorous edge. Stipe short or nearly absent, eccentric to lateral, up to 10 mm wide, smooth, white to pale red (7A2-3). Context white to pale red (7A3), and 4-8 mm thick in pileus, solid and white to pale red (7A3) in stipe. Taste and odor not recorded. Spore print pale pinkish to withe.
Basidiospores [75,3,3] (5.5–)7.5–7–8(–8.9) × (3–)3–4–5(–5) μm, Q = (1.13–)1.43–1.78–2.49(–2.53), broadly ellipsoid to subcylindrical, hyaline, smooth, thin-walled. Basidia (18–)19–22.6–28(–29) × (4–)4–5.6–7(–7) μm, clavate, hyaline, thinwalled, 4-spored, rarely 3- or 2-spored. Lamellar edge sterile. Cheilocystidia (12–)12.5–18.8–26(–26) × (5–)5–5.7–7(–7) μm, more or less convex with, subventricose to clavate and some clavate to utriform, hyaline, thin-walled. Pleurocystidia absent. Hyphal system dimitic, similar in stipe context and pileus context; skeletal hyphae 4–6 μm wide, very thick-walled, hyaline, septate, elements with 2–3 branches; generative hyphae 4.5–5 μm wide, cylindrical, slightly thick-walled, hyaline. Pileipellis a cutis composed of hyaline hyphae, 4–5 μm wide, with cylindrical terminal elements 50–91 μm in length. Stipitipellis not observed. Clamp connections present in all observed tissues.
Habitat and distribution: Saprotrophic on decaying wood, growing solitary or in cluster of 2–6 basidiomes. It has been reported from Argentina, Brazil, Indonesia, Japan as P. salmoneostramineus Lj.N. Vassiljeva, Malaysia, Mexico, Thailand, and Central Lao PDR in this study.
Materials examined: Laos–Vientiane Capital, Xaythany district, Houay Yang Forest Reserve, collected on 15 September 2015, P. Sysouphanthong, HNL503398; ibidem, collected on 15 September 2015, P. Sysouphanthong, HNL503399.
Noted: Pleurotus djamor was divided into six varieties by Corner, based on differences in pileus and lamellae color, shape of stipe, and spores. The six varieties are P. djamor var. cyathiformis Corner, P. djamor var. djamor (Rumph. ex Fr.) Boedijn, P. djamor var. fuscoroseus Corner, P. djamor var. fuscopruinosus Corner, P. djamor var. roseus Corner, and P. djamor var. terricola Corner [46]. Our collections of P. djamor from Lao PDR were in good condition with young to mature stages. They showed pinkish, pastel red to reddish orange surface turning paler to white or whitish with age of basidiomata, pink to pale red lamellae and pale pink to white spore print. The morphology of those specimens fits well with the description of P. djamor var. roseus from Malaysia, with pinkish basidiomata, pink lamellae, oblong basidiospores 7–10 × 3–4 μm, clavate basidia 18–27 × 6–7 μm, and clavate cheilocystidia 30–45 × 8–14 μm. However, cheilocystidia of Lao specimens are smaller (12.2–25.4 × 5.5–6.2 μm) than those of the Malaysian specimens. P. djamor var. cyathiformis differ from Lao specimens by pileus white to pallid ochraceous basidiomata, P. djamor var. fuscoroseus pileus fuscous livid, P. djamor var. fuscopruinosus lamellae white to pallid ochracoeos (rarely tinged pink), P. djamor var. djamor and P. djamor var. terricola pileus nearly or quite lateral, imbricate. Three varieties of P. djamor have been reported from Argentina, namely P. djamor var. djamor, P. djamor var. roseus and P. djamor var. cyathiformis. Specimens from Brazil identified as P. djamor [44] have much larger basidiospores than our specimens from Lao PDR 10–11 × 3–5 μm, basidia 25–26 × 5–6 μm, and cheilocystidia 21–26 × 6– 10 μm. Menolli et al. [44] recognized that their identification was uncertain and that their collections might belong in other varieties or even different species. ITS sequences of Lao PDR specimens are most closely related to the specimens of P. djamor from Malaysia, which also supports the identification of Lao PDR specimens as P. djamor.
Fig. 1 Fresh basidiomata of Pleurotus djamor. a–b (HNL503398), c–d (HNL503399). Scale bar a–d=
20mm.
Fig. 3 Micromorphology of Pleurotus djamor (HNL503398). a = basidia and basidioles, b =basidiospores, c = cheilocystidia, d = pileipellis, e = skeletal hyphae from pileus context, f = generative hyphae from pileus context.
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