Cortinarius subcaesiobrunneus Y. Li & M.L. Xie, 2019
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publication ID |
https://doi.org/ 10.11646/phytotaxa.392.3.4 |
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persistent identifier |
https://treatment.plazi.org/id/03EDCF4D-5976-976F-FF7D-F8603810AE42 |
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treatment provided by |
Felipe |
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scientific name |
Cortinarius subcaesiobrunneus Y. Li & M.L. Xie |
| status |
sp. nov. |
Cortinarius subcaesiobrunneus Y. Li & M.L. Xie View in CoL sp. nov. ( Figs. 2 View FIGURE 2 , 3 View FIGURE 3 )
Fungal Names FN 570595
Diagnosis:—Differing from other species in section Brunnei by at least 12 substitutions and indel positions, larger basidiospores, violaceous colors of the stipe and occurrence during the summer season.
Etymology:—The name refers to the similarity macroscopically to Cortinarius caesiobrunneus .
Type:— CHINA. Gansu Province: Gansu Qilianshan National Nature Reserve, Yugu Autonomous County of Su’nan, Zhangye city, coniferous forest ( Picea crassifolia Kom. ), ASL 2700m, 38°33′13″ N, 100°17′5″ E, 11 August 2018, Mengle Xie, HMJAU44436 (Holotype!). GenBank accession number (ITS region): MK234567.
Description:— Pileus 1.4–3.7 cm, strongly hygrophanous, blunt conical to hemispherical, later low convex with a rounded to conical umbo, sometimes with wavy margin, brown (6E8) or reddish brown (8E5) to black brown (6F8), lighter color after losing water, sometimes with small fibrillose scales on the surface. Lamellae medium spaced, up to 5 mm wide, emarginate, brown (6E8), uneven. Stipe 3–9.5 cm long, 0.8–1.5 cm diam, cylindrical or clavate, up to 2 cm diam at base, white to grayish white fibrillose, later brown (6E8) to reddish brown (8E7), strongly bluish fibrils at base when wet. Universal veil white, forming a girdle on the apex stipe. Context strongly hygrophanous, dark brown (7C5), marbled watery when moist, paler on drying, slightly bluish at apex of stipe. Odour strongly raphanoid. Chemical reaction in 10% KOH, pileus turns dark reddish brown or black brown (6F8), context turns brown (6E8). Exsiccata blackish.
Basidiospores (7.8)8.7–10.2(10.5) × 6.8–7.9 μm, Q = 1.14–1.42, ⎯ x = 9.0–9.5 × 7.1–7.5 μm, ⎯ Q = 1.25–1.28 (90 spores, 3 collections), broadly ellipsoid to subglobose, finely to moderately, sharply verrucose, yellow-brown to brown in KOH, faintly to moderately dextrinoid. Lamellar edge almost sterile, with clavate marginal cells, 11–33 × 6–10 μm, colorless or slightly olivaceous yellow in KOH. Basidia 4-spored, 28–44 × 8–13 μm, colorless or olivaceous brown in KOH. Universal veil hyphae pale olivaceous yellow or colorless in KOH. Pileipellis hyphae of epicutis 3–9 μm wide, olivaceous brown to dark olivaceous brown in KOH, with small encrusted spots on the surface. Hypodermium present, hyphae 10–22 μm wide, slightly olivaceous brown in KOH. Clamp connections present.
Ecology and distribution:—In coniferous forest, Picea crassifolia , gregarious, From Gansu Province, China.
Specimens examined:— CHINA. Gansu Province: Gansu Qilianshan National Nature Reserve, Minle County, Zhangye City, coniferous forest ( Picea crassifolia ), ASL 2860m, 38°17′55″ N, 100°45′54″ E, 9 August 2018, Mengle Xie, HMJAU44434, GenBank accession number (ITS region): MK234565. Gansu Qilianshan National Nature Reserve, Yugu Autonomous County of Su’nan, Zhangye city, coniferous forest ( Picea crassifolia ), ASL 3006m, 38°44′57″ N, 99°47′56″ E, 10 August 2018, Mengle Xie, HMJAU44435, GenBank accession number (ITS region): MK234566.
Comments:—The ITS sequences (536 bp) of the three collections of C. subcaesiobrunneus are exactly same and differ from other species of section Brunnei by at least 12 substitutions and indels. The phylogenetic analysis showed that C. subcaesiobrunneus and C. brunneovernus are closely related. However, the stipe of C. brunneovernus is brownish to blackish rather than violaceous and the spores measure 7.5–9.0 × (5.5)6.0–6.5(7.0) μm ( Niskanen et al. 2013a), which are smaller than those of C subcaesiobrunneus . According to the phylogenetic tree, each species has sufficient genetic distance to ensure that they are independent species, also the morphology is different, but the genetic relationship between the species is not absolutely clear therefore the phylogenetic relationships in section Brunnei need further study.
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