Hypomyces pseudolactifluorum F. M. Yu, Q. Zhao & K. D. Hyde, 2020

Yu, Feng-ming, Jayawardena, Ruvishika S., Liu, Jianwei, Hyde, Kevin D. & Zhao, Qi, 2020, Hypomyces pseudolactifluorum sp. nov. (Hypocreales: Hypocreaceae) on Russula sp. from Yunnan, PR China, Biodiversity Data Journal 8, pp. 53490-53490 : 53490

Hypomyces pseudolactifluorum F. M. Yu, Q. Zhao & K. D. Hyde sp. nov.

Materials

Type status: Holotype. Occurrence: catalogNumber: MFLU 20-0265 ; recordedBy: Jian-Wei Liu; lifeStage: Telemorph; Taxon: scientificName: Hypomycespseudolactifluorum; Location: country: China; stateProvince: Yunnan; locality: Baoshan, Longyang, Baihualing ; verbatimElevation: 2094m; locationRemarks: label transliteration: "Yunnan, Baoshan, Longyang, Baihualing, on Russula sp., 20 July 2018, Jian-Wei Liu; [云南宝山百花岭 2094 m, 2018.07.20, 刘建伟]; verbatimCoordinates: 25°17.931'N, 98°47.0718'E; decimalLatitude: 25.2989; decimalLongitude: 98.7845; georeferenceProtocol: label; Identification: identifiedBy: Feng-Ming Yu; dateIdentified: 2019 Type status: Paratype. Occurrence: catalogNumber: MFLU 20-0266 ; recordedBy: Jian-Wei Liu; lifeStage: Telemorph; Taxon: scientificName: Hypomycespseudolactifluorum; Location: country: China; stateProvince: Yunnan; locality: Baoshan, Longyang, Baihualing ; verbatimElevation: 2094m; locationRemarks: label transliteration: "Yunnan, Baoshan, Longyang, Baihualing, on Russula sp., 20 July 2018, Jian-Wei Liu; [云南宝山百花岭 2094 m, 2018.07.20, 刘建伟]; verbatimCoordinates: 25°17.931'N, 98°47.0718'E; decimalLatitude: 25.2989; decimalLongitude: 98.7845; georeferenceProtocol: label; Identification: identifiedBy: Feng-Ming Yu; dateIdentified: 2019 Type status: Isotype. Occurrence: catalogNumber: HKAS 107300 ; recordedBy: Jian-Wei Liu; lifeStage: Telemorph; Taxon: scientificName: Hypomycespseudolactifluorum; Location: country: China; stateProvince: Yunnan; locality: Baoshan, Longyang, Baihualing ; verbatimElevation: 2094m; locationRemarks: label transliteration: "Yunnan, Baoshan, Longyang, Baihualing, on Russula sp., 20 July 2018, Jian-Wei Liu; [云南宝山百花岭 2094 m, 2018.07.20, 刘建伟]; verbatimCoordinates: 25°17.931'N, 98°47.0718'E; decimalLatitude: 25.2989; decimalLongitude: 98.7845; georeferenceProtocol: label; Identification: identifiedBy: Feng-Ming Yu; dateIdentified: 2019

Description

Index Fungorum number: IF557817

Sexual morph. Subiculum light yellow (4A4-5) when fresh and pale orange, light orange to brownish-orange (5A3-4, 5C4, 6C6) after being dried, usually covering the pileus, stipe and deformed gills of the host mushroom. Perithecia aggregated, semi-immersed to immersed in subiculum, except for their erumpent papilla, yellowish-brown to dark brown (5E6, 6E6, 6F6-8), pyriform to subglobose, 262-484 × 136-284 μm; perithecial wall 12-25 μm thick, single-layer, cells 9-22 × 4-8 μm. Papilla prominent, 129-177 μm high, at base 135-284 μm wide. Asci 8-spored, cylindrical, 147-222 × 4-9 μm; apex thickened, 4.9-6.0 wide and 2.5-3.0 μm high. Ascospores uniseriate and with ends overlapping, fusiform, 30-38 × 6-8 μm, single-septate, septum median and with dense verrucae and prominently apiculate, apiculi 4.5-8.0 μm long, straight or curved. Asexual morph: unknown. (Fig. 1 )

Diagnosis

The new species is similar to Hypomyces lactifluorum on Russula and Lactarius spp. from North America ( Rogerson and Samuels 1994), but has smaller perithecia and shorter asci. The main differences of the two species are compared in Table 4 .

Etymology

Referring to the most closely-related species, Hypomyces lactifluorum.

Distribution

PR CHINA (Yunnan).

Host

On the fruiting bodies of Russula sp. that grew on the humus layer in an evergreen broad-leaved forest of a rainforest. The host mushrooms: basidiocarps medium-sized and infundibuliform, pilei 63-77 mm in diameter. As serious degradation has occurred, the colour and other characters of the host mushrooms cannot be determined. Molecular phylogenetic evidence indicates it is a Russula species.

Notes

Only sexual morph had been discovered on the hosts ( Russula sp.) of the new species.

Figures

Figure 1. Hypomyces pseudolactifluorum sp. nov .. a: The host mushroom (Russula sp.); b-e: Perithecia embedded in subiculum effused over the substratum; d-e: Median sections of an ascoma; f: Section of peridium; g-l: Asci with ascospores; m-t: Ascospores. Scale bars: a = 5 cm; b = 1 mm; c = 200 μm; d, e = 100 μm; f, g = 50 μm; h - l = 20 μm; m - t = 10 μm.