Lignosus rhinocerus(Cooke) Ryvarden, Norw. Jl Bot. 19: 232 (1972)
Basionym: Polyporus rhinocerus Cooke, Trans. & Proc. Bot. Soc. Edinb. 13: 150 (1879)
Fomes rhinocerus (Cooke) Sacc. [as'rhinocerotis'], Syll. fung. (Abellini) 6: 152 (1888)
Scindalma rhinocerus (Cooke) Kuntze, Revis.gen. pl. (Leipzig) 3 (3): 519 (1898)
Polyporus sacer var. rhinocerus (Cooke) Lloyd, Mycol. Writ. 6 (Letter 65): 1037 (1920)
Polystictus rhinocerus (Cooke) Boedijn, Bull.Jard. bot. Buitenz, 3 Ser. 16 (4): 390 (1940)
Microporus rhinocerus (Cooke) Imazeki, Bull.Gov. Forest Exp. Stn Tokyo 57: 113 (1952)
A Basidiomata of Lignosus rhinocerus. B Stipe showing sclerotium. C Generative hyphae showing clamp connection. D Binding hyphae. E Basidiospores. Scale bars: A = 30 mm, B = 50 mm, C = 4 μm, D = 8 μm, E = 4 μm.
Index Fungorum number: IF316915, Faceoffungi number: FoF09471
Basidiomata annual, large sized, solitary, hard and tough, centrally stipitate, up to 200 mm tall. Pileus 150 mm in diameter, 60 mm thick, circular in outline, narrowly infundibuliform, conectrically zonate, weakly sulcate, radially wrinkled, yellowish brown (OAC820), with a greenish tint due to presence of algae, yellowish shades fades on drying, margin paler, wavy to lobed, thin. Hymenophore poroid. Pores 5-8 per mm, angular, irregular, absent along margin, minutely tuberculate, dirty white, brownish on bruising. Context 2 mm thick, creamish white, homogenous. Stipe 100 mm long, up to 15 mm thick, cylindrical, even with underground sclerotium, stipe surface having some irregular depressions, glabrous, light brown, tissue, cream, appear as more or less hollow. Sclerotium irregularly elongated, up to 80 mm long, cream, dirty and soiled, bone hard especially on drying. Odour not distinctive. Spore print not observed.
Basidiospores 3-4.5 × 1.5-2 μm, L = 3.5, W = 1.97 Q = 1.5-2, Qm = 1.8, subcylndrical to broadly ellipsoid, hyaline, thin walled, guttulate or eguttulate, coloured in aqueous solutions of 3% phloxine and 1% congo red mixture, acyanophilic in cotton blue, inamyloid in Melzer's reagent. Basidia not observed. Cystidia absent. Hymenial trama interwoven, and trimitic. Generative hyphae 2-3 μm wide, hyaline, thin walled, smooth, rarely branched, with clamp connections. Skeletal hyphae 2-4 μm wide, hyaline smooth, thick walled (1 μm), frequently branched, mostly without lumen. Binding hyphae present, 1.5-3 μm wide, hyaline to very pale brown, thick walled (up to 1 μm), frequently branched, with a wide to narrow lumen. Pileal trama interwoven. Generative hyphae 2-3 μm wide, hyaline, smooth, thin walled, branched, with clamp connections. Skeletal hyphae predominant, 2-5 μm wide, hyaline to pale brown, thick walled (1 μm), branched. Binding hyphae 2-3 μm wide, hyaline to pale brown, branched, mostly without lumen. Pileipellis interwoven at base to form short, more or less agglutinated trichodermal patches, that are 10-25 μm long, made of hyphae 2-4 μm wide, hyaline and solid. Stipe trama interwoven. Generative hyphae 2-3 μm wide, hyaline, smooth, thin walled, branched, with clamp connections. Skeletal hyphae predominant, 2-7 μm wide, hyaline, thick walled (up to 2 μm), rarely branched, septations not observed. Binding hyphae less frequent, 2-5 μm wide, hyaline, highly branched, thick walled and solid. Stipitipellis similar as pileipellis, more agglutinated trichoderm than pileipellis, each hyphae 2-4 μm wide, hyaline.
Material examined - India, Kerala State, Kollam district, Thenmala, Thenmala forest, on the ground, 23 September 2019, Vinjusha N, ZGCVN903.