Panus paraibensis V. Galv

Galvão, Vitória Ingrid P., Koroiva, Ricardo & Wartchow, Felipe, 2023, A new species of Panus (Panaceae, Polyporales) from Paraíba, Brazil, Phytotaxa 619 (2), pp. 173-181 : 176

Panus paraibensis V. Galv „o, Koroiva & Wartchow, sp. nov.

Figs. 2–3

MycoBank: MB #849349

Type: BRAZIL, Paraíba, Areia, Parque Estadual Mata do Pau-Ferro , Trilha do Cumbe , 27 July 2021, F. Wartchow 68/2021 ( JPB 66873 , holotype) .

Etymology: refers to the Brazilian state “ Paraíba ” where the holotype was found.

Basidiomata small, pleurotoid. Pileus 20–35 mm in diam. and 32–65 mm wide, pale pink (OAC 548) with whitecream tones (OAC 785), convex plane with a smooth margin, surface villous, with a more villose/velvety appearance at margin, more abundant near stipe; context thin, fleshy. Hymenophore lamellate lamellae decurrent, close, pale or white (OAC 459), edge entire, continuously concolorous, 32 mm long and 4 mm broad. Stipe very short, laterally inserted, to 9 mm in length and 10 mm in width, squamose/villose, concolorous to pileus.

Basidiospores 4.4–5.5 × 2–2.9 µm (L = 4.9 µm, W = 2.5 µm, Q = 1.69–2.45, Qm = 1.99) scarce, ellipsoid to sometimes phaseoliform in shape, hyaline, inamyloid, thin-walled; hylar appendix very small. Basidia difficult to discern, measuring up to 20 × 3.8 µm, clavate, four sterigmata. Pleurocystidia as leptocystidia, 26.5–70.6 × 6.1–18.6 µm (L = 44.9 µm, W = 13.9 µm, Q = 2.37–4.34, Qm = 3.33), sometimes arising deep in the subhymenium and projecting shortly above the level of the other hymenial elements; mostly ventricose-mucronate, frequently with a short obtuse mucro, then occasionally sphaeropenduculate-clavate; colorless, thin-walled. Cheilocystidia 28–46.7 × 4–9.8 µm (L = 35 µm, W = 6.6 µm, Q = 3.65–7.47, Qm = 5.50), versiform, narrowly clavate, narrowly fusoid-ventricose, clavatemucronate to clavate, sometimes capitate, hyaline, colorless, mostly thin to occasionally very slightly thick walled. Lamella trama irregular, with interwoven thin to slightly thick walled 4–5 µm wide hyphae, hyaline, inamyloid. Pileipellis a cutis constituted by periclinally arranged narrow septate hyphae 1.5–5.1 µm wide, hyaline, slightly thick-walled.

Habitat: in pair on a small decayed log in a montane wet forest (“brejo de altitude”) from the Brazilian semiarid (Caatinga) region (IBGE 2004, 2012).

Distribution: known only from the type locality.

Figures

FIGURE 2. Basidiomata of Panus paraibensis (JPB 66873, holotype). A, C. Pileus surface. B, D. Hymenophore.

FIGURE 3. Panus paraibensis. A. Hyphae from the pileus context. B. Basidiospores. C–D. Pleurocystidia. E–F. Cheilocystidia.