Fuscoporia terminalianae E. Arumugam, S. Gunaseelan & M. Kaliyaperumal, 2025

Gunaseelan, Sugantha, Kezo, Kezhocuyi, Arumugam, Elangovan, Karunarathna, Samantha C., Fahad Al-Arjani, Al-Bandari, Elgorban, Abdallah M., Kumla, Jaturong, Suwannarach, Nakarin, Chukeatirote, Ekachai & Kaliyaperumal, Malarvizhi, 2025, Three new species of Fuscoporia (Hymenochaetales, Basidiomycota) from southern India revealed by morphological and multigene phylogenetic analyses, MycoKeys 125, pp. 147-166 : 147-166

Fuscoporia terminalianae E. Arumugam, S. Gunaseelan & M. Kaliyaperumal sp. nov.

Fig. 4

Diagnosis.

Morphologically, F. terminalianae can be diagnosed by an annual, resupinate to effused, often pileate basidiome, infrequently warted, and widely zonate pilear surface with homogeneous context. Microscopically, the presence of cystidioles and ellipsoidal, acyanophilic basidiospores are characteristic features of this species.

Holotype.

India • Tamil Nadu, Kallakurichi District, Vellimalai ( 11°86'16"N, 78°70'16"E), on dead wood ( Terminalia bellerica), 30 Oct. 2019, M. Kaliyaperumal, VM 2 A ( holotype MUBL 1107 ). GenBank: PP 390501 ( nrLSU); PQ 098033 ( ITS); PV 638733 ( rpb 2); PV 638739 ( tef 1-α).

Etymology.

Refers to the host tree Terminalia bellerica on which the fungus was collected.

Description.

Basidiome annual, resupinate to effused, reflexed, pileate, applanate, sessile, fused to imbricate, soft when fresh, corky when dry. Pilei dimidiate, projecting up to 2.8 cm long, 5.4 cm wide, and 3.2 cm thick at the base. Pileal surface light brown (6 D 5), brown (6 E 8) to dark brown (6 F 8), smooth, widely zonate, infrequently warted. Margin brown (6 E 8), velutinate, obtuse to acute, up to 3 mm in thickness. Marginal setae absent. Pore surface brown (6 E 7) to dark brown (6 F 8), glancing. Pores round to angular, 6–9 per mm. Context light brown (6 D 8), zonate, homogenous, up to 3 mm in thickness. Tube layer golden brown (5 D 7) to light brown (6 D 8), hard and corky, with tubes up to 2 mm long.

Hyphal system. Hyphal system dimitic; generative hyphae simple septate; tissue darkening but otherwise unchanged in KOH.

Context. Generative hyphae hyaline to golden yellow, thin to thick-walled, branched, frequently septate, 2–5 µm; skeletal hyphae dominant, rust-brown, thick-walled with a medium to wide lumen, unbranched, occasionally septate, 2.5–4.8 µm.

Tubes. Generative hyphae mostly present at dissepiment edges and subhymenium, hyaline to pale yellow, thin to thick-walled, frequently branched and simple septate, 1.5–5.2 mm, most of the hyphae at dissepiment edges and hymenium are encrusted with simple crystals, skeletal hyphae dominant, yellowish brown, thick-walled with a medium to wide lumen, frequently septate, more or less straight, subparallel along the tubes, 2.5–5 mm. Hymenial setae ventricose to subulate, mostly originating from tramal hyphae, dark brown, thick-walled, 13-45 × 4-7 µm. Cystidioles hyaline, fusoid to subulate, rare, tapering at the end, 9–32 × 4.5–7 µm. Basidioles broadly clavate 5–13 × 2.5–6 µm. Basidia broadly clavate, hyaline, four sterigmata, 5.2–15 × 2.9–6 µm. Basidiospores ellipsoid, hyaline, thin-walled, smooth, CB ̄, IKI ̄, (3 –) 3.3–4.3 (– 4.5) × (2.5 –) 2.8–3 µm, Q = 1.48, Q range = 1.2–1.7, (n = 30 / 2).

Additional specimen examined.

India • Tamil Nadu, Kallakurichi District, Vellimalai ( 11°87'77"N, 78°69'52"E), on dead wood ( Terminalia bellerica), 30 Oct. 2019, M. Kaliyaperumal, VM 2 B. GenBank: PQ 113745 ( nrLSU); PQ 098034 ( ITS); PV 638734 ( rpb 2); PV 638740 ( tef 1-α) .

Notes.

In multigene phylogenetic analyses, F. terminalianae forms an isolated lineage within the F. torulosa complex. Fuscoporia rhabarbarina is distinguished from F. terminalianae by its glabrous, sulcate pilear surface, number of pores, and basidiospore size; in contrast, F. terminalianae has a smooth, infrequently warted, widely zonate pilear surface ( Dai 2010). Fuscoporia licnoides and F. terminalianae are similar in having a zonate basidiome and homogeneous context, but the latter differs in having an effused-reflexed basidiome, larger setae, and smaller basidiospores ( F. terminalianae 3–4.5 × 2.5–3 μm vs. F. licnoides 4–5 × 2.5–3.5 μm) ( Oliveira and Gibertoni 2023). Fuscoporia terminalianae , F. senex , and F. torulosa are similar in having applanate, dimidiate basidiomes with narrowly zonate pilear surfaces and dimitic hyphal systems, as well as the presence of cystidioles and cyanophilic basidiospores, while F. terminalianae differs in having a warted pilear surface and smaller basidiospores ( Dai 2010).

Figures

Figure 4. Fuscoporia terminalianae (holotype MUBL 1107). a. Basidiomes; b. Habitat; c. Pore surface; d. Transverse section of a basidiome; e. Dissepiment edges and skeletal hyphae; f, g. Hymenial setae; h. Cystidioles; i. Basidioles; j. Basidia; k. Basidiospores. Scale bars: 2 cm (a – d); 5 μm (e – k).