Lyophyllum pallidofumosum Y. H. Ma, W. M. Chen & Y. C. Zhao

Tang, Song-Ming, Yu, Feng-Ming, Karunarathna, Samantha C., Luo, Zong-Long, Niu, Kai-Yang, Li, Rui-Yu, Li, Lin, Su, Xi-Jun & Li, Shu-Hong, 2025, Morpho-phylogenetic analyses of two novel edible mushrooms from China and a mini review of Lyophyllum (Agaricales, Lyophyllaceae) cultivation and bioactivities, MycoKeys 112, pp. 307-334 : 307-334

Lyophyllum pallidofumosum Y. H. Ma, W. M. Chen & Y. C. Zhao , in Ma, Liu, Zhao, Chen & Zhao, Phytotaxa 576 (2): 178 (2022)

Figs 2 C – F , 5 , 6

Description.

Pileus 2.0–6.0 cm diameter, fleshy, fragile, hemispherical, becoming convex with age, smooth on the surface, dry, grayish orange (# e 4 dfdb) on the center, soft orange (# dbcca 9) with margin, slightly depressed to papilla of center, deflexed to inflexed of margin; pileus context thick, 0.2–0.3 cm wide, white (# fcfcfc). Lamellae moderately close together, arcuate, subdecurrent to decurrent, broad, white (# fcfcfc), unchanging color when injured, 2–3 tiers, 0.2–0.3 cm wide, edge even or entire. Stipe 4–7 × 0.9–1.1 cm, wide bulbous at the base, smooth; stipe context white (# fcfcfc), 1.2–3.0 cm wide, bulbous at the base, smooth; stipe context white (# fcfcfc), unchanging in color when injured. The odor and taste were not distinctive.

Basidiospores [73 / 2 / 2] 4.5–6.6 × 4.0–5.9 μm, (Q = 1.0–1.3, Qm = 1.11 ± 0.10), av. 5.38 ± 0.59 × 4.89 ± 0.61 μm, globose, subglobose to broadly ellipsoid, hyaline, smooth. Basidia 19–28 (– 35) × 10–15 μm (N = 20), av. 25.6 ± 4.1 × 12.1 ± 1.64 μm, mostly 2 - spored, rarely 4 - spored, sterigmata long 2.9–4.1 μm, sometimes with basal clamp connections, clavate, siderophilous granulations. Subhymenium is composed of moderately thin-walled hyphae, 15–20 μm thick, with 1–2 layers of ovoid, fusiform to narrowly cylindrical hyphae, 3–7 × 2–4 μm. Hymenophoral trama regular, 110–160 μm wide, consisting of thin and hyaline hyphae, some with clamp connections, narrowly cylindrical hyphal elements 2–5 μm wide. Cheilocystidia were 10–15 × 4–6 μm, av. 12.2 ± 1.8 × 5.0 ± 0.4 μm, narrowly cylindrical or narrowly clavate, rarely apex flexed, mostly narrowing with apex, thin-walled. Pleurocystidia were 12–18 × 4–6 μm in size and av. 14.8 ± 4.1 × 4.4 ± 1.1 μm, narrowly cylindrical or narrowly clavate, rarely apex flexed, mostly narrowing with apex, thin-walled. Pileipellis is an interwoven trichodermium composed of almost hyaline interwoven filamentous hyphae, terminal cells 2–5 μm wide, almost cylindrical to subcylindrical, occasional hyphal tips flexuous and sometimes inflate, and some with clamp connections. Stipitipellis composed of appressed, parallel, thin-walled, 2–4 µm wide, fusiform, thin-walled. Clamp connections are present at some septa in the pileipellis, lamellae, and stipitipellis.

Habitat.

Clustered, it occurs in the Sichuan and Yunnan provinces.

Additional species examined.

China • Chongqing Municipality, elev. 1,980 m, October 12, 2023, Song-Ming Tang, L 6883, HKAS 135649 ; • Chongqing Municipality, elev. 2,152 m, L 6884, October 12, 2023, Song-Ming Tang, HKAS 135650 .

Notes.

Lyophyllum pallidofumosum , a new edible mushroom, has been published by Ma et al. (2022). However, the original description of L. pallidofumosum lacks cheilocystidia, pleurocystidia, pileipellis, and stipitipellis. Thus, in this study, we provide a more comprehensive description of L. pallidofumosum .

Figures

Figure 2. Fresh basidiomata of the two new Lyophyllum species A, B L. edulis (A L 6737 holotype, B L 6741) C – F L. pallidofumosum (C L 5100, D L 5099, E, F L 6883). Scale bars: 1 cm.

Figure 5. Lyophyllum pallidofumosum L 6883 (HKAS 135649) A cheilocystidia B pleurocystidia C basidia D cheilocystidia E clamp connections F basidiospores. Scale bars: 10 μm.

Figure 6. Lyophyllum pallidofumosum (L 6883, HKAS 135649) A pileipellis B stipitipellis. Scale bars: 10 μm.