Meripilus emarginatus Y. C. Dai, Chao G. Wang & Yuan Yuan, 2025
publication ID |
https://doi.org/10.3897/imafungus.16.161336 |
DOI |
https://doi.org/10.5281/zenodo.17363138 |
persistent identifier |
https://treatment.plazi.org/id/33FB8212-05B9-540E-8804-EA882774676E |
treatment provided by |
by Pensoft |
scientific name |
Meripilus emarginatus Y. C. Dai, Chao G. Wang & Yuan Yuan |
status |
sp. nov. |
Meripilus emarginatus Y. C. Dai, Chao G. Wang & Yuan Yuan sp. nov.
Figs 16 View Figure 16 , 17 View Figure 17
Etymology.
Emarginatus (Lat.): refers to the basidiomata of species lacking a sterile margin.
Diagnosis.
Differs from other Meripilus species by resupinate basidiomata with a white pore surface when fresh, round to angular pores of 6–7 per mm, thick-walled and apically encrusted hyphoid cystidia, thin-walled and smooth hymenial cystidia, subglobose to globose basidiospores measuring 4.8–5.2 × 4.5–5.2 µm.
Type.
CHINA • Guangdong Province, Guangzhou, Baiyunshan Forest Park , on rotten angiosperm wood, 18 April 2023, Dai 24682 A ( BJFC 042236 About BJFC , holotype) .
Description.
Basidiomata annual, resupinate, soft to ceraceous, and without odor or taste when fresh, becoming fragile upon drying, up to 8 cm long, 5 cm wide, and 0.6 mm thick at the center. Pore surface white when fresh, unchanged after bruising, pinkish buff to clay buff when dry; sterile margin absent; pores round to angular, 6–7 per mm; dissepiments thin, slightly lacerate. Subiculum very thin to almost absent. Tubes concolorous with pore surface, fragile when dry, up to 0.6 mm long. Hyphal system monomitic; generative hyphae simple septate, hyaline to pale yellowish, smooth, IKI -, moderately CB +; tissues unchanged in KOH. Tramal hyphae slightly thick-walled with a wide lumen, occasionally branched, frequently simple septate, slightly flexuous, subparallel along the tubes, agglutinated, 4–5 µm in diam. Hyphoid cystidia present, arising from tramal hyphae and completely embedded in trama, not projecting from the hymenium, sometimes projecting from the dissepiment edge, thick-walled with swollen tips, apically encrusted, 6–12 µm in diam. at the apex; hymenial cystidia present, fusoid, thin-walled, smooth, 20–25 × 4.5–5.5 µm; cystidioles fusoid, thin-walled, smooth, 13–14 × 5–6 µm; basidia barrel-shaped to capitate, with four sterigmata and a simple basal septum, 15–17 × 7–8 µm; basidioles mostly pyriform, smaller. Crystals present among the hymenium and tube trama. Basidiospores subglobose to globose, hyaline, thin-walled, smooth, sometimes with one small or large guttule, IKI -, weakly CB +, (4.5 –) 4.8–5.2 (– 5.5) × 4.5–5.2 (– 5.5) µm, L = 5.11 µm, W = 4.90 µm, Q = 1.03–1.05 (n = 90 / 3).
Additional specimens examined.
CHINA • Fujian Province, Fuding County, Tailao Mts. , on fallen trunk of Cunninghamia , 22 August 2016, Dai 16971 ( BJFC 023076 About BJFC ) ; • Guangdong Province, Guangzhou, Baiyunshan Forest Park , on rotten angiosperm wood, 18 April 2023, Dai 24683 A ( BJFC 042237 About BJFC ) , Maofengshan Forest Park , on rotten angiosperm wood, 19 April 2023, Dai 24694 A ( BJFC 042248 About BJFC ) ; • Xizang Autonomous Region, Linzhi , Motuo County, on dead Miscanthus , 24 October 2023, Dai 26696 ( BJFC 044246 About BJFC ) .
Notes.
Meripilus emarginatus is similar to M. albostygius (Berk. & M. A. Curtis) Westph. & Rajchenb. , M. eminens , M. rigidus (Y. C. Dai, Chao G. Wang & Vlasák) Westph. & Rajchenb. , M. srilankensis , and M. sulphureus (Y. C. Dai, Yuan Yuan & Chao G. Wang) Westph. & Rajchenb. in micromorphology by the thick-walled hyphoid cystidia and subglobose basidiospores. However, M. albostygius has a red to violet pore surface when fresh, smaller pores (8–10 per mm vs. 6–7 per mm, Wang et al. 2024), and smaller basidiospores (4–4.7 × 3.2–4 µm vs. 4.8–5.2 × 4.5–5.2 µm, Wang et al. 2024), and to date is only known from Central and South America; M. eminens also has ceraceous basidiomata with a white pore surface when fresh, almost the same size angular pores (7–8 per mm vs. 6–7 per mm, Dai 1998) and basidiospores (4.2–6 × 3.9–5.2 µm vs. 4.8–5.2 × 4.5–5.2 µm, Dai 1998), but, it differs from M. emarginatus by the absence of thin-walled and smooth hymenial cystidia; M. rigidus differs from M. emarginatus by a brown-red pore surface when fresh, smaller pores (10–12 per mm vs. 6–7 per mm, Wang et al. 2024), smaller basidiospores (4–4.6 × 3.2–4 µm vs. 4.8–5.2 × 4.5–5.2 µm, Wang et al. 2024), and, to date, is only known from Central America; M. srilankensis is distinguished from M. emarginatus by distinctly thick-walled and wider tramal hyphae (3.8–8 µm in diam. vs. 4–5 µm in diam., Wang et al. 2024) and the absence of hymenial cystidia; M. sulphureus differs from M. emarginatus by a sulphur yellow pore surface when fresh and relatively smaller basidiospores (4–5 × 3.5–4 µm vs. 4.8–5.2 × 4.5–5.2 µm, Dai and Dai 2018). In macro-morphology, Meripilus emarginatus has an unchanged pore surface.
Phylogenetically, Meripilus emarginatus forms an independent lineage nested in the Meripilus clade (100 % ML, 1.00 BPP, Figs 3 View Figure 3 , 4 View Figure 4 ). However, it grouped with M. dollingerii (Y. C. Dai, Chao G. Wang & Vlasák) Westph. & Rajchenb. and M. malayanus in a joint subclade (90 % ML, 1.00 BPP, Fig. 4 View Figure 4 ). Although Meripilus dollingerii and M. emarginus share thin-walled smooth hymenial cystidia and almost the same size as basidiospores (4.5–5.5 × 4–5 µm in M. dollingerii , 4.8–5.2 × 4.5–5.2 µm in M. emarginatus , Wang et al. 2024), M. dollingerii has a pinkish to red pore surface when fresh and thin-walled apically encrusted hyphoid cystidia. Meripilus malayanus also has thick-walled and apically encrusted hyphoid cystidia, but it differs from M. emarginatus by hard corky basidiomata when dry, a grayish brown pore surface, and the presence of a sterile margin.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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