Agaricales » Lyophyllaceae  » Termitomyces

Termitomyces gilvus

Termitomyces gilvus C.S. Yee, and J.S. Sathiya Seelan

MycoBank MB829475.

Pileus 80–130 mm in diam, fleshy, at first convex becoming convexo-applanate with strongly blunt pointed perforatorium and irregularly lobed margin; Surface brownish orange (5C6) to dark brown at the center, brownish-yellow (5C7) to orange-white (5A2) toward the margin, rough to slightly smooth; perforatorium usually dark brown (6F5) velar squamules; margin enrolled when young and expanding toward the age, never uplifting, often crenulate. Lamellae free, white to pinkish (11A2) to 11 mm wide, densely crowded, with two series of lamellulae between lamellae. Context up to 40 mm thick, white, comprising repent, thin-walled hyphae, 2.7–7.7 µm diam, inflating to 28 µm. Spore print pink. Odor pleasant. Stipe 9–13 cm long above ground, 5–11 cm thick, enlarged to 1–6 cm diam. at ground level and usually abruptly forming a prominent globose bulb below ground, solid, robust, fibrous, surface above and pale brown on the bulb; with concolorous, sparsely distributed floccules. Partial veil ephemeral and often absent after the initial stage. Pseudorrhiza to 3 cm long, narrowing to 30–60 mm immediately below the bulb or tapering toward the base, surface white to pale brown, with longitudinal grooves and cracks. Basidiospores 6–8.5 × 3.7–5.4 µm (Q = 1.5–1.6(1.8), n = 20), ovoid to ellipsoid, subhyaline, thin-walled. Basidia 21.8–29.2 × 6.1–8.3 µm, clavate, bearing four sterigmata. Hymenophoral trama regular, 8.0–20 µm wide, of hyaline hyphae, 2.5–22.0 µm diam. Subhymenial layer 12.0–30.0 µm diam. wide, repent hyphae, 2.4–2.9 µm diam. Lamella-edge heteromorphous, with crowded cheilocystidia, dispersed with basidia. Cheilocystidia clavate to pyriform, 36.8–51.1 × 12.7–24.8 µm, thin-walled. Pleurocystidia abundant, clavate to pyriform, occasionally turbinate, 47.0–66.3 × 21.2–31.5 µm, thin-walled. Pileipellis a repent epicutis of narrow, radial hyphae, 14.2–14.9 µm. Clamp connection present.

Habitat: Scattered to gregarious around termite (Macrotermes gilvus) mounds or on soil within campus area.

Etymology: The species epithet is named after the host termite species that was found.

Notes: Termitomyces gilvus mainly found scattered to gregarious near termite mound (colonies of Macrotermes gilvus). The species is morphologically and phylogenetically similar to T. bulborhizus. The pileal surface color of T. gilvus is brownish-orange compared to T. bulborhizus (KM128338, China) which has a darker reddish-brown in color. Termitomyces gilvus has smaller bulbous stipe and shorter pseudorrhiza compared to T. bulborhizus. Microscopically, T. gilvus has slightly larger basidia and pleurocystidia compared to T. bulborhizus.

Fig 1 Phylogenetic position of Termitomyces species inferred from concatenated nrLSU-mtSSU sequences using maximum likelihood analysis. Bootstrap and posterior probability values (ML/PP: 100%/1.0) are indicated above/below branches. The new species in in bold.

 

Fig 2 Fruit body of Termitomyces gilvus sp. nov. (BORH/FUMS-A03, holotype). (A–B, E) surface of pileus; (C) lamellae; (D, F) stipe.

Fig. 3 Microscopic features of Termitomyces gilvus sp. nov (BORH/FUMS-A03, holotype). (A) basidiospores; (B) basidia; (C) cheilocystidia; (D) pleurocystidia. Scale bar = 10 µm.

 

Reference

Sathiya Seelan JS, Shu Yee C, She Fui F, Dawood M, Tan YS, Kim MJ, Park MS, Lim YW. 2020 – New Species of Termitomyces (Lyophyllaceae, Basidiomycota) from Sabah (Northern Borneo), Malaysia. Mycobiology, 48(2), pp.95-103.

 

 

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