Cortinarius pseudotorvus A.Naseer, J.Khan, & A.N.Khalid

Bose, Arunima, Niskanen, Tuula, Datta, Sudeshna, Ghosh, Aniket, Vizzini, Alfredo & Das, Kanad, 2024, Two new species and a new record of Cortinarius subgenus Telamonia (Agaricales) from India, European Journal of Taxonomy 970, pp. 38-60 : 53-55

Cortinarius pseudotorvus A.Naseer, J.Khan, & A.N.Khalid

Figs 6–7

Material examined

INDIA • Uttarakhand, Bageshwar District, Dhakuri ; 2454 m a.s.l.; 30.0712° N, 79.9183° E; 14 Aug. 2023; on the soil under Quercus semecarpifolia ; Arunima Bose, AB23-039; GenBank no.: PP316967 (ITS); CAL [ CAL 1967 ] • ibid.; 2963 m a.s.l.; 30.0711° N, 79.9183° E; 15 Aug. 2023; on the soil under Q. semecarpifolia ; Arunima Bose, AB23-050; GenBank no.: PP349829 (ITS); CAL [ CAL 1985 ] .

Description

Pileus 49–95 mm diam., hemispherical to low convex when young, becoming low convex, with a low, broad umbo; margin incurved, sometimes split; surface smooth, shiny when moist, reddish gray (12D2) to pastel violet (18B4) with shiny white margin, turning reddish brown (8E4) with KOH, hygrophanous. Lamellae broadly attached, rather distant (7–8/cm at pileus margin, lamellulae in 4 series), broad; grayish violet (17C4); edges entire. Stipe 85–95 mm long, 10–13 mm wide at apex, up to 20 mm wide at base, clavate, dark violet (18D6). Universal veil white, forming a membranous annular zone on upper part of stipe. Basal mycelium white. Pileus context whitish gray, color unchanging when bruised, consistency thick, stipe context fibrous, solid, thick. Odor fruity. Taste not recorded.

Basidiospores 9.0–10.4–13.0 × 4.8–5.1–5.2 μm, Q = 1.80–2.16–2.50, n=30, ellipsoid to obovoid-ellipsoid, moderately verrucose. Basidia 25–46 × 11–25 μm, clavate, 4-spored; Pileipellis duplex: suprapellis of horizontal, cylindrical, repent, compactly arranged parallel hyphae (up to 7 μm wide) with yellowish intracellular pigmentations; hypoderm consisting of inflated elements up to 50 μm wide. Clamp connections present.

Remarks

The ITS sequence data coupled with morphological characters placed these Indian collections as Cortinarius pseudotorvus which was originally reported from Pakistan ( Naseer et al. 2020). Though the macro- and micromorphological features mostly agree with the Pakistani specimen, the latter is reported with smaller basidiomata (15–30 mm broad pileus, stipe up to 56 mm long and wide 4–9 mm at the apex and 11–13 mm at the base). Phylogenetically, Cortinarius torvus (Fr.) Fr. (originally reported from Europe), is quite close to present Indian collections. However, C torvus is separated by possessing a rounded umbonate pileus with whitish buff to slightly lilac margin, grayish brown lamellae with slightly crenate to ciliate edges ( Breitenbach & Kränzlin 2000; Kibby & Tortelli 2022).

Figures

Fig. 6. Cortinarius pseudotorvus (Arunima Bose, AB23-050, CAL). a–c. Fresh basidiomata. d. Basidia. e. Basidiospores (SEM). Scale bars: d = 10 µm; e = 2 µm.

Fig. 7. Cortinarius pseudotorvus (Arunima Bose, AB23-039, CAL). a. Basidiospores. b. Basidia. c. Elements of pileipellis. d. Marginal elements. Scale bars = 10 µm.