Chalciporus hainanensis Ming Zhang & T.H. Li, 2017

Zhang, Ming, Li, Tai-Hui & Song, Bin, 2017, Two new species of Chalciporus (Boletaceae) from southern China revealed by morphological characters and molecular data, Phytotaxa 327 (1), pp. 47-56 : 50-51

Chalciporus hainanensis Ming Zhang & T.H. Li sp. nov.

MycoBank: MB821521

Etymology: hainanensis refers to the type locality in Hainan Island.

Diagnosis:—It is characterized by small basidiomata with olive yellow to brownish orange pilei, orange-yellow to brownish orange tubes, white to yellowish white context staining blue at first, then gradually changing to grayish orange to grayish red when exposed, and small basidiospores 8–10.5(11) × 4–5(5.5) μm.

Type:— CHINA. Hainan Province, Ledong county, Jianfengling National Natural Reserve, at 18°43′N, 108°51′E, alt. 1000 m, 3 July 2013, Ming Zhang (GDGM44464, holotype!).

Description: —Basidiomata small. Pileus 2–3 cm wide, hemispheric at first, then becoming convex to nearly plane, occasionally turning upwards at margin when mature, fleshy, surface dry, velvety-tomentose to fibrillose, grayish yellow, olive yellow, grayish orange to brownish orange (4B4–7B4, 4C4–7C4). Context 2–4 mm thick, soft, white to yellowish white (3A1–4A1, 3A2–4A2), changing blue at first, then gradually changing to grayish orange to brownish orange or grayish red (4B4–5B4, 4C4–5C4) when bruised. Tubes 3–5 mm deep, slightly depressed to subdecurrent, yellow, orange-yellow to orange (3B8–5B8) at young, brownish yellow to brownish orange (4C8–7C8) when mature, unchanging or slightly changing blue when bruised. Pores 1–1.5 mm in diam, circular to angular, pore surface grayish yellow to brownish yellow (4C8–5C8) initially, becoming brownish orange to brownish red (6C8–9C8) when mature, slightly changing blue when bruised. Stipe 30–40 × 3–5 mm, central, solid, subcylindrical or clavate, equal or slightly enlarged downward, concolorous with pileus, sometimes ribbed by the decurrent lamella lines at apex, usually with a brownish red annulus at apex, gradually darkening to yellowish brown to dark brown (5D8–6D8) downwards to base, often slightly becoming bluish brown where injured, surface dry, smooth to velvety-tomentose, or sometimes longitudinally striate, with yellowish to yellow basal mycelium. Stipe context yellowish brown to brown (5D8–6D8), slightly changing to blue when exposed, and then becoming unevenly reddish brown to dark brown mixed with bluish brown. Odor indistinctive and taste slightly peppery.

Basidiospores [80/2/2] 8–10.5(11) × 4–5(5.5) μm, [Q = (1.7)1.9–2.2(2.5), Qm = 2.06 ± 0.15], fusiform, cylindrical to somewhat oblong, barely inequilateral in profile, smooth, thin walled, yellowish to yellowish brown in 5% KOH, yellow brown to dark brown in Melzer’s reagent. Basidia 25–33 × 9–14 μm, clavate, yellowish white to hyaline in 5% KOH, 2, 4-sterigmate, 2–3.5 μm long. Pleurocystidia 43–70 × 7–12 μm, scattered, projecting and conspicuous, narrowly fusiform, thin-walled, smooth, yellowish white to hyaline, and usually containing some yellowish brown scattered oleiferous substance in 5% KOH. Cheilocystidia similar to pleurocystidia, abundant and conspicuous, fusoid to subclavate, smooth, thin-walled, hyaline or, more frequently, with scattered dark yellowish brown content. Hymenophoral trama subparallel, yellowish white to hyaline in 5% KOH, with hyphae 4–13 μm broad. Pileipellis an intricate trichoderm to interwoven subcutis of erect hyphae 3–8 μm in diam, branched, yellowish white to hyaline in 5% KOH, dark brown to rusty brown in Melzer’s reagent; terminal elements cylindrical, clavate or nearly fusoid. Stipitipellis a tangled layer of repent to suberect hyphae 4–13 mm in diam, forming the dotted ornamentation over surface of stipe, yellowish white to hyaline in 5% KOH, end hyphae 6–20 μm diam. Clamp connections absent in all tissues.

Habitat and distribution:—Solitary or scattered on humus and debris under Fagaceae mixed with other broadleaf trees, alt. 800–1200 m; currently only known from Hainan Province.

Additional specimens examined:― CHINA. Hainan Province, Changjiang county, Bawangling National Nature Reserve, at 19°21′ N, 109°12′ E, alt. 1000 m, 8 July 2013, Chao-Qun Wang (GDGM46161)