Tricholomopsis scabra J.A. Cooper, 2016

Cooper, Jerry A. & Park, Duckchul, 2016, The fungal genus Tricholomopsis (Agaricales) in New Zealand, including Tricholomopsis scabra sp. nov., Phytotaxa 288 (1), pp. 69-76 : 72-73

Tricholomopsis scabra J.A. Cooper sp. nov. ( Fig. 2 )

IndexFungorum IF552507

Holotype PDD 102579 . New Zealand, North Island. ITS KY010823 . LSU KY010832 .

Etymology:―scabra, referring to the pileus, which is covered in coarse scaly tufts of agglutinate hyphae.

Diagnosis:―Distinguished from all other species of Tricholomopsis by the degree of scabrosity of the pileus and habitat in tea-tree scrub and podocarp forests of New Zealand.

Macro-morphology:―Pileus 60–100 mm diam., convex becoming concave, with lightly inrolled margin. Base colour light orange (6 A 5) to orange (6 A 6) overlaid with a dense covering of radially arranged erect fibrous scales, dull red (8 C 4) to reddish brown (8 E 7 to 9 F 8) in colour. Stipe 80–120 mm × 7–12 mm, orange (6 A 6) to reddish brown (8 E 8), with coarse, longitudinally arranged surface fibrils. Lamellae pale orange (5 A 4 to 5 A 5), edge entire, with lamellulae. Spore print white. Gregarious in litter on the ground and associated with base of standing dead trees.

Micro-morphology:―Spores broadly ellipsoid, neither amyloid nor dextrinoid, hyaline, with refractive wall, with hilar appendage, length 6.6 μm (σ = 0.34) × 5.0 μm (σ = 0.31), Q = 1.30 (σ = 0.10), n = 20.Average of 5 collections: 6.3 μm (σ = 0.39) × 5.3 μm (σ = 0.32), Q = 1.24 (σ = 0.08), n = 5 × 20. Basidia 25–35 × 6–8 μm, 4-spored. Lamella edge sterile. Cheilocystidia cylindrical to clavate, 50–80 × 6–12 μm, 1- or 2-septate, occasionally with yellow plasmatic pigment. Clamp connections present in all tissue. Pleurocystidia absent. Pileipellis a cutis of loosely woven hyphae about 5 μm diam.; scales of loose to dense aggregations of erect hyphae, 5–10 μm diam., brown in KOH.

Material examined:― NEW ZEALAND. North Island, Katikati, Aongatete, on root of dead standing tree of Kunzea , 9 May 2003, P. White, PDD 78235. NEW ZEALAND. North Island, Waitakere Ranges, Clark Bush Track, on bark at base of Leptospermum tree, 26 May 1976, J. M. Dingley, W. S. M. Versluys, PDD 34860. NEW ZEALAND. North Island, Manukau, Murphy’s Bush, 2 June 2004, C. Shirley ( CS AK 155), PDD 81264. NEW ZEALAND. North Island, Manukau City, Wairere Road, Totara Park, on ground, 10 July 2007, C. Shirley ( CS AK 385), PDD 102100. NEW ZEALAND. North Island, Waitakere, Upper Nihotupu Dam track, Piha Rd, in litter associated with Leptospermum sp. , 8 May 2011, C. Shirley ( CSAK 379), PDD 102579 (Holotype).

Habitat and distribution:―in tea-tree scrub ( Kunzea spp . & Leptospermum spp .), and podocarp-dominated forest in New Zealand.

Comments: — T. scabra ( Fig. 2 ) is macroscopically more similar to T. rutilans than to T. ornaticeps because it often shows a dominant reddish-brown colouration to the pileus, which is absent in T. ornaticeps . The 2 species are easily distinguished by the degree of pileus scabrosity in T. scabra , its smaller stature, much smaller cheilocystidia, and habitat.

Figures

FIGURE 2. Tricholomopsis scabra. A) fruitbody, PDD 102579 (holotype), scale = 15 mm; B) cheilocystidia (composite image), PDD 102579 (holotype), scale = 40 μm; C) spores (composite image), PDD 102579 (holotype), scale = 20 μm; D) cheilocystidia and basidium (composite image), PDD 102100, scale = 20 μm. Photos:A by Clive Shirley, B, C, D by Jerry Cooper.