Hyphodermella paulusiae M. Duenas, Telleria & M. P. Martin 2026, sp. nov.

Hyphodermella paulusiae M. Dueñas, Telleria & M. P. Martín sp. nov. Figs 6 C, 8 Type. New Zealand • Bay of Plenty: near Ruatahuna, Tarapounamu, on decaying branch; 3 Dec 2006; B. C. Paulus and P. R. Johnston legs.; BCP 4176, (holotype 92259, PDD!, GenBank: MZ 147703, MZ 147778, MZ 147915). Etymology. Named after Barbara Paulus, a New Zealand mycologist, who collected the holotype and for her significant contribution to the knowledge of New Zealand's mycobiota. Diagnosis. Macroscopically this new species is similar to H. rosae; it is characterized by the size of basidia, 25–42 × 5–8 μm, L = 31.5, W = 6.3, spores 6–10 × 4–6 μm, L = 7.7, W = 4.9, and by the phylogenetic position as sister of the other Hyphodermella species. Description. Basidioma resupinate, adnate, orbicular to confluent, thin at first, thicker and stratified with age, crustose; hymenophore ceraceous, cream (89. p. Y), yellow grayish (90. gy. Y), darker with age (91. d. gy. Y – 87. m. Y), odontioid, with scattered to crowded aculei, under the lens penicillate by the projection of encrusted cystidioid hyphae, cracked with age; margin fibrillose when young, determinate with age, lighter than the hymenophore. Hyphal system monomitic; hyphae hyaline, without clamps, distinct, thin- to thick-walled, (2 –) 3–5 μm, sometimes encrusted; numerous encrusted cystidioid hyphae forming fascicles, projecting in the hymenium. Basidia clavate, with constrictions, 25–42 × 5–8 μm, L = 31.5, W = 6.3, with 4 sterigmata. Spores ellipsoid, with oil drops in the protoplasm, 6–10 × 4–6 μm, hyaline, thin-walled and smooth. L = 7.7, W = 4.9, Q = 1.6. Habitat and distribution. On decayed and rotten wood in Callitris, Eucalyptus, and Nothofagus forests. Known from Australia and New Zealand. Additional specimens examined. Australia • New South Wales: North Western Plains, Killarney State Forest, 16.6 km (by road) N of Narrabri, Spargo Road of Murrumbilla Lane; 30°13'19"S, 149°50'47"E; 270 m alt.; on rotten wood on Eucalyptus – Callitris forest; 11 May 2005; H. Lepp 5014, CANB 752189 • North Western Slopes, Warrumbungle National Park, Whitegum Lookout carpark, 24 km (by road) W of Coonabarabran; 31°17'22"S, 149°02'29"E; 720 m alt.; on fallen, rotting, eucalypt branch; 12 May 2005, H. Lepp 5088 • North Coast, Cottan-Bimbang National Park, Myrtle Gully Road / Scenic Drive, 4.8 km along road (from Walcha end) from Osley Highway; 31°21'45"S, 152°00'38"E; 980 m alt.; on soft dead stem loose on ground in rainforest with isolated eucalypts and Nothofagus; 28 Apr 2005; J. A. Curnow 6146, CANB 889543. New Zealand • Te Urewera: Mangapae UA 1 E, n. m, on decaying wood; 11 Oct 2004; P. R. Johnston and B. C. Paulus legs.; BCP 3073, PDD 94113 • ibid; BCP 3080, PDD 94114 • ibid; Tarapounamu, W side Rd.; 27 Oct 2009; P. R. Johnston and B. C. Paulus; PRJ 47, PDD 85550.