Tricholosporum tamilnaduense (Asproinocybaceae, Agaricales), a new species from Eastern Ghats, Tamil Nadu, India Author Kayalvizhi, Agnes 0000-0002-0633-0858 Mycological Research Laboratory, Department of Botany, Madras Christian College (Autonomous), Tambaram, Chennai - 600059, India (Affiliated to University of Madras) kayalantony18@gmail.com Author Manogaran, Nivetha 0009-0009-9869-6467 Mycological Research Laboratory, Department of Botany, Madras Christian College (Autonomous), Tambaram, Chennai - 600059, India (Affiliated to University of Madras) nivethamycology@gmail.com Author Munuswamy, Kumar 0000-0003-3412-7539 Mycological Research Laboratory, Department of Botany, Madras Christian College (Autonomous), Tambaram, Chennai - 600059, India (Affiliated to University of Madras) & Environmental Studies Programme, Madras Christian College (Autonomous), Tambaram, Chennai - 600059, India kumarmycologymcc@gmail.com text Phytotaxa 2025 2025-02-28 690 2 255 266 https://doi.org/10.11646/phytotaxa.690.2.6 journal article 10.11646/phytotaxa.690.2.6 1179-3163 16703622 Key for the accepted species of genus Tricholosporum 1a. Spore length less than 7µm ................................................................................................................................................................8 1b. Spore length exceeds 7µm..................................................................................................................................................................2 2a. Spore elongated cruciform or stauriform, length greater than 8.5 µm, usually in grassland ................................... T. goniospermum 2b. Spore cruciform or stauriform, length less than 8.5 µm, usually in litter ..........................................................................................3 3a. Basidiomata small up to 6 cm , cystidia present; ventricose—mucronate or rostrate...................................... T. subporphyrophyllum 3b. Basidiomata large more than 6 cm , cystidia present or absent...........................................................................................................4 4a. Hymenial cystidia absent, pileus viscid................................................................................................................ T. porphyrophyllum 4b. Hymenial cystidia present, pileus viscid or non-viscid ......................................................................................................................5 5a. Pileus non viscid.................................................................................................................................................................................7 FIGURE 1. Tricholosporum tamilnaduense : a. dorsal view of basidioma; b. ventral view of basidioma. Scale bars: a–b = 1cm. FIGURE 2. Tricholosporum tamilnaduense : a–b. basidiomata (MCCHF220202, Holotype); b. hymenial trama; c. trama; d. basidiospores; e. basidia; f. laticifers hyphae; g. pleurocystidia; h. cheilocystidia. Scale bars: a–b = 1 cm; c = 20 µm; d = 4 µm; e = 5 µm; g–h = 5µm. FIGURE 3. Tricholosporum tamilnaduense : a. basidiospores; b. basidia; c. pleurocystidia; d. cheilocystidia. Scale bars: a = 2 µm; b = 2.5 µm; c – d = 5 µm. 5b. Pileus viscid to subviscid....................................................................................................................................................................6 6a. Pileus viscid, surface yellow to lemon yellow, lamellae hygrophanus .............................................................. T. subgoniospermum 6b. Pileus sub-viscid, surface dark vinaceous with dark yellow tinge, lamellae non hygrophanus............................ T. longicystidiosum 7a. Pileus and stipe with violaceous tinge, smoothy and shiny..................................................................................... T . laeteviolaceum 7b. Pileus and stipe without violaceous tinge, yellow to ochre, velvety or fibrillose ................................................... T. haitangshanum 8a. Spores length more than 5.5 µm, basidiomata rarely showing violet tinge .....................................................................................13 8b. Spore length less than 5.5 µm, basidiomata showing violet tinge .....................................................................................................9 9a. Hymenial cystidia absent, basidiomata large ............................................................................................................ T. atroviolaceum 9b. Hymenial cystidia present, basidiomata small or large ....................................................................................................................10 10a. Basidiomata large, up to 13 cm , spores mostly rhomboid, rarely cruciform .................................................................. T . violaceum 10b. Basidiomata small, up to 6 cm , spores mostly cruciform to stauriform...........................................................................................11 11a. Pileus bluish violet, up to 6 cm , usually tropical............................................................................................................... T . tropicale 11b. Pileus pale to deep violet, up to 4 cm , usually subtropical to temperate..........................................................................................12 12a. Pileus deep violaceous lilac, mottled with elongated yellowish-white spots, cystidia long up to 42µm long.............. T . caraibicum 12b. Pileus pale violet, without yellowish white spots, cystidia small up to 26µm long.............................................. T . pseudosordidum 13a. Basidiomata small, up to 6 cm , cystidia present ..............................................................................................................................15 13b. Basidiomata large, up to 12 cm , cystidia present or absent..............................................................................................................14 14a. Cystidia present, pileus up to 12 cm ............................................................................................................................ T. cossonianum 14b. Cystidia absent, pileus up to 10 cm ...................................................................................................................... T. tetragonosporum 15a. Pileus without violaceous tinges, surface viscid, lamellae non hygrophanous ................................................................. T. palmense 15b. Pileus with violaceous tinge, surface non viscid, lamellae hygrophanous.......................................................................................16 16a. Entire pileal surface with violaceous tinge, stipe light violet to violet, cystidia large up to 50 µm............................. T. guangxiense 16b. Only pileal margins with violaceous tinge, stipe lilac to brown, cystidia small upto 35µm................................... T. tamilnaduense