Inosperma subsphaerosporum Y. G. Fan, L. S. Deng, W. J. Yu &amp; L. Y. Liu 2021, sp. nov.
Creators: name: Deng, Lun-Sha
name: Yu, Wen-Jie
name: Zeng, Nian-Kai
name: Liu, Li-Jie
name: Liu, Li-Yue
name: Fan, Yu-Guang
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Agaricales
Inocybaceae
Inosperma
Inosperma subsphaerosporum

description: <i>Inosperma subsphaerosporum</i> Y.G. Fan, L.S. Deng, W.J. Yu &amp; L.Y. Liu <i>sp</i>. <i>nov</i>. Figs.2–4 MycoBank: MB838448 Etymology: The specific epithet “ <i>subsphaerosporum</i> ” refers to the shape of basidiospores. Diagnosis: Differs from <i>I. carnosibulbosum</i> by having more globose basidiospores and clavate to cylindricalclavate cheilocystidia. Type:— CHINA. Hainan Province: Ledong Li Autonomous County, Yinggeling substation of Hainan Tropical Rainforest National Park, 18°53ʹ27.21′′N, 109°19ʹ36.87′′E, elev. 400 m, 13 July 2020, L.-Y. Liu &amp; Y.-G. Fan, <i>FYG5848</i>, FHMU3153 (holotype), GenBank nos.: MT 072898 (ITS), MT 071203 (LSU), MT 076849 (<i>rpb</i> 2). Description:— <i>Basidiomata</i> medium-sized. <i>Pileus</i> conical when young, then convex to umbonate-convex, finally plano-convex to applanate with a subacute or occasionally obtuse umbo; margin initially incurved and then decurved for a long time, never straight; surface dry, initially smooth with a thin whitish veil layer around the disc, becoming appressed-scaly with radial patches of veil remnants, fibrillose-rimulose elsewhere, margin rimose to strongly split in age; yellowish brown (6C6) to chocolate brown (6E6) around the center, yellowish white (5A4) to beige (5A2) towards margin; uniformly brownish yellow (4A4) to goldish yellow (4A7) when overmatured. <i>Lamellae</i> crowded, adnexed, alternating with several tiers of lamellula, 2–4 (6) mm wide, dirty-white (5A1) or beige (5A2) at first, then grayish white (6B1) to brownish gray (6C2), brownish yellow (6B4) to brown (6D6) in age; edge pallid (5A1), fimbricate to finely serrate. <i>Stipe</i> 55–115 × 6–10 (12) mm, terete, equal at upper half with a slightly swollen apex, thicker downwards with a swollen base; recurved squamulose at the apex, longitudinally fibrillose with sparse protruding fibrils downwards, base pure white (6A1) with tomentose hyphae; ivory white (7A1) to grayish white (6B1), background brownish or pinkish beneath the cuticle. <i>Context</i> solid, fleshy in pileus, ivory white, with brownish (5C6) tinge under the umbo, becoming brownish (5D8) with age, 4–8 mm thick at the center, 2–3 mm thick at mid-radius; fibrillose and striate in the stipe, lightly brownish or pinkish (6B8). <i>Odor</i> slightly salty or mild. <i>Basidiospores</i> [115/5/3] (5–) 6–7.5(–8) × 5–6(–6.5) μm, Q = 1.00–1.27 (–1.30), Q m = 1.13, subglobose to globose, occasionally broadly ellipsoid, smooth, yellowish or tan, indistinct small apiculus, inner with a large circular yellow oil-droplet. <i>Basidia</i> 26–31 × 7–8 μm, clavate to broadly clavate, occasionally obtuse at the apex and slightly tapering at the base, 4-spored, sterigmata 3–4.5 μm in length, hyaline to yellowish, with one or more bright yellow, oily inclusions when mature. <i>Pleurocystidia</i> absent. <i>Cheilocystidia</i> 27–50 × 8–11 μm, abundant, versiform, clavate, cylindricalclavate or occasionally broadly clavate to fusiform, often with obtuse apex, or narrowly tapered into capitate or subcapitate at the apex, septate and often constricted at septa, mostly thin-walled, some with walls up to 1 μm thick at the apex or towards the middle, colorless, at times with yellow intracellular contents. <i>Hymenophoral trama</i> 43–77 μm thick, regular to sub-regular, colorless to slightly yellowish, composed of cylindric to inflated hyphae 19–32 μm wide. <i>Pileipellis</i> a cutis, goldish yellow or tan, composed of sub-regular, thin-walled, yellowish, cylindrical hyphae, 7–10 μm wide, slightly encrusted. <i>Stipitipellis</i> regularly arranged, yellowish, disrupted with entangled, extended hyphae, 4–10 μm wide, terminal elements usually inflated to cheilocystidoid cells 39–62 × 10–21 μm, clavate to elongate or broadly clavate, hyaline, obtuse at the apex, occasionally capitate at the apex, thin-walled. <i>Oleiferous hyphae</i> 5–10 μm wide, present in pileus and stipe trama, yellow or bright yellow, smooth, bent, diverticulate, occasionally branched. <i>Clamp connections</i> present, common in all tissues. Habitat: gregarious in small groups or scattered along roadsides under fagaceous trees. Distribution: Known only from the type locality in Hainan Province, China. Additional specimen examined: CHINA. Hainan Province, Ledong Li Autonomous County, Yinggeling substation of Hainan Tropical Rainforest National Forest Park, 18°53ʹ27.21′′N, 109°19ʹ36.87′′E, elev. 400 m, 13 Jul. 2020, under fagaceous trees, L.-Y. Liu &amp; N.-K. Zeng, <i>FYG5846</i> (FMHU 3155), Y.-G. Fan &amp; L.-S. Deng, <i>FYG5847</i> (FMHU 3154).
description: Published as part of <i>Deng, Lun-Sha, Yu, Wen-Jie, Zeng, Nian-Kai, Liu, Li-Jie, Liu, Li-Yue &amp; Fan, Yu-Guang, 2021, Inosperma subsphaerosporum (Inocybaceae), a new species from Hainan, tropical China, pp. 169-178 in Phytotaxa 502 (2)</i> on pages 172-176, DOI: 10.11646/phytotaxa.502.2.5, http://zenodo.org/record/5425027
description: {"references": ["Pradeep, C. K., Vrinda, K. B., Varghese, S. P., Korotkin, H. B. &amp; Matheny, P. B. (2016) New and noteworthy species of Inocybe (Agaricales) from tropical India. Mycological Progress 15: 24. https: // doi. org / 10.1007 / s 11557 - 016 - 1174 - z", "Latha, K. P. D. &amp; Manimohan, P. (2017) Inocybes of Kerala. SporePrint Books, Calicut, 181 pp."]}