Fuscoporia semiarida Lima-Júnior, C.R.S. de Lira & Gibertoni, sp. nov.

Index Fungorum number: IF 825473; MycoBank number: MB 825473; Facesoffungi number: FoF 05769; Fig. 1

Etymology – (L.) semiaridus, referring to the dryer areas of Brazil

Holotype – URM 83800.

Basidiomata annual to biannual, pileate, sessile, occasionally effused-refexed, applanate, widely attached, semicircular, sometimes imbricate, 0.8–3.5 cm long, 0.7–2.8 cm wide, 0.3–0.7 cm thick, corky in thick specimens and coriaceous to tough in thin ones when dried. Upper surface light, greyish to dark brown (12 fulvous, 17 snuff brown, 28 milk coffee), glabrous, sulcate in concentric and narrow zones. Margin acute, entire or rarely weakly lobed, concolorous with upper surface, occasionally golden yellow (H). Context homogeneous, light brown (12 fulvous), 0.1–0.2 cm at the middle of basidiomata. Pores tiny, almost invisible to the naked eye, circular, 7–9/mm, dark brown (12 fulvous, 17 snuff brown), dissepiments entire, thick, tubes light to dark brown (12 fulvous, 17 snuff brown), 0.1 cm.

Basidiospores ellipsoid, thin-walled, hyaline, 4–5×2–3.0 µm (L=4.4 µm, W=2.55 µm, Q=1.73 µm), IKI–. Basidia clavate, hyaline, thin-walled, 9–13×4–4.5 µm. Hyphal system dimitic, generative hyphae hyaline, narrow, thin-walled and simple septate, 1.5–2.8 µm wide; skeletal hyphae dominating in the context and dissepiments, yellow to brownish, thick-walled, 2.5–3.9 µm wide. Hymenial setae lanceolate to ventricose, thick-walled, apex acuminate, brown, 18–26×5–7 µm (L=22.93 µm, W=5.47 µm, setal index=4.2 µm).

Material examined – BRAZIL, Ceará, Crato, Floresta Nacional do Araripe-Apodi, C.R.S. Lira 872, May 15 2012, (URM 83800, holotype; isotype O), on dead wood; Bahia, Santa Terezinha, Serra da Jibóia, 24 September 2010, T.B. Gibertoni 34 (URM 83436 as Phellinus gilvus); Ceará, Crato, FLONA Araripe-Apodi, 17 May 2012, C.R.S. Lira 919 (URM 83798 as P. gilvus); Goiás, Alto Paraíso de Goiás, Loquinhas, 17 March 2016, T.B. Gibertoni PH2 (URM 91200 as P. gilvus); Pernambuco, Triunfo, Sítio Carro Quebrado, 28 January 2010, C.R.S. Lira & C.A.S. Trajano 23 (URM 82508 as P. gilvus); ibid. 1 March 2010, C.R.S Lira & N.C. Lima-Júnior 16 (URM 82510 as P. gilvus); ibid. 1 March 2010, C.R.S. Lira & N.C. Lima-Júnior 9 (URM 82511 as P. gilvus); Piauí, Caracol, PARNA Serra das Confusões, 14 March 2012, C.R.S. Lira 541 (URM 83926 as P. gilvus).

Additional specimens examined – Fuscoporia callimorpha: CAMEROON, Campo Province, Akok lowland rain forest reserve, 2 December 1991, M. Núñez & L. Ryvarden 31041 (O F-915116); ibid. 2 December 1991, M. Núñez & L. Ryvarden 31066 (O F-915115); ZAMBIA, Victoria Falls, 27 January 1988, L. Ryvarden 25297 (O F-915114); ZAMBIA, Victoria Falls Riverine forest, 4 January 1990, L. Ryvarden 27254 (O F-915112); ZIMBABWE, Manicaland Province, J. Meikle Res. Station, 24 January 1994, M. Núñez & L. Ryvarden 33811 (O F-915113); ZIMBABWE, Mvuma district, Beacon Hill, 5 January 1987, L. Ryvarden 25028 (O F-915111).

GenBank numbers – ITS: MH392562, MH392563, MH392564, MH392565; LSU: MH407361, MH407362, MH407363, MH407364.

Notes – Fuscoporia semiarida is characterized by annual to biannual basidiomata, sulcate in concentric narrow zones, ellipsoid basidiospores and lanceolate to ventricose hymenial setae. It was previously identifed as Phellinus gilvus  (Schwein.) Pat.[= F. gilva (Schwein.) T. Wagner & M. Fisch.] and F. callimorpha (Lév.) Groposo, Log.-Leite & Góes-Neto. P. gilvus has a blackish abhymenial surface and thicker basidiomata, as seen in the type (PH 74281), and was originally collected in the USA (Pennsylvania), while F. callimorpha has perennial basidiomata, with zones that may be absent, and narrower basidiospores; also the type was originally collected in Madagascar (Ryvarden and Johansen
1980).

Figure 1 – Fuscoporia semiarida (URM 83800, holotype) a Abhymenial surface b Hymenial surface c Setae d Basidiospores. Photos: R.L. Alvarenga. Scale bars: a=1 cm, b=1 cm, c=10 μm, d=5 μm