Public Description of Cortinarius hallowellensis A.E. Wood

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Name: Cortinarius hallowellensis A.E. Wood
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Description status: Unreviewed

Taxonomic Classification:

Domain: Eukarya
Kingdom: Fungi
Phylum: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Cortinariaceae

General Description:

Cortinarius hallowellensis was treated as ‘Cortinarius sp. AU2’ in Harrower et al. (2015). Based on sequencing the type, we have demonstrated that this species occurs in Tasmania as well as Western Australia. Cortinarius hallow-ellensis is unique in the C. violaceus group in that it has an ixocutis instead of a trichoderm and is the deepest diverging lineage in the C. violaceus clade (Fig. 1). Macroscopically, the pileus is not at all squamulose. e suprapellis is muci-laginous imparting a greasy appearance when wet. e only other species in the C. violaceus group found in Australia – C. kioloensis is readily distinguished from C. hallowellensis by its dry, tomentulose-squamulose pileus. Cortinarius jenolanensis, C. paraviolaceus and C. austroviolaceus lack a squamulose pileus, but unlike C. hal-lowellensis, they lack pleurocystidia and/or cheilocystidia. Cortinarius hallowellensis is also referred to as C. violaceus by Bougher and Syme (1998) (PERTH 5506794 il-lustrated). Unique molecular synapomorphies are found at pos. 63, 100, 101, 123, 132, 148, 163, 164, 180, 228 (ITS1), 462, 532, 540, 546, 577, 602, 611, 614, 643 (ITS2) in our alignment.

Diagnostic Description:

Type. AUSTRALIA. Western Australia: Mount Hallowell Reserve, (Eucalyptus) 22 May 1993 K. Syme (holotype: PERTH005506794).

Description. Pileus 34–90 mm wide, not velvety or velvety smooth, not at all squa-mulose, greasy when wet, radially innately brillose when dry, dark violet (18F4), red in 5% KOH. Lamellae broadly adnexed to adnate, 4–9 mm deep, subdistant, dark violet (16F5), edge smooth, entire, lamellulae abundant in 2 tiers. Stipe 37–80 mm long, 10–30 mm thick, dry, longitudinally brillose, cylindrical to clavate with a swollen base, 16F4 (dark violet). Universal veil deep violaceus. Context rm in pileus, brous in mature stipe, pallid, tinged purplish (16A2) especially near outside; purple slate/deep purple in stipe and middle of pileus surrounded by speckled white in pileus; yellow-brown at base of stipe. Basal mycelium whitish.

Odor not distinctive. Taste none.

Basidiospores (8.5–) 10–13.5 µm × (5–) 6–7.5 µm, means = 10–12 µm × 6–7 µm, Q = 1.55–1.95, Q means = 1.55–1.94, (150 spores, 6 specimens), ellipsoid to 13subamygdaliform, moderately verrucose, plage barely noticeable under SEM. Basidia 4-spored, clavate, (25–) 30–50 (–65) µm × 9–12 µm. Cheilocystidia abundant, nar-rowly fusiform, purple or brown in KOH, (50–) 55–95 (–130) µm × 10–20 µm. Pleurocystidia abundant, narrowly fusiform, purple or brown in KOH, (40–) 50–90 (–105) µm × (5–) 10–15 µm. Caulocystidia not observed. Pileipellis an ixocutis, of even thickness throughout. Hyphae 2.5–11.0 µm wide. Clamp connections present.

Ecology and distribution. With Eucalyptus, Corymbia, Melaleuca, Allocasuarina, Agonis, and/or Leptospermum in Western Australia and Tasmania. Fruiting May and June.

Description author: Excited delirium [EXD]▼ (Request Authorship Credit)