Tricholosporum tamilnaduense (Asproinocybaceae, Agaricales), a new species from Eastern Ghats, Tamil Nadu, India Kayalvizhi, Agnes Manogaran, Nivetha Munuswamy, Kumar Phytotaxa 2025 2025-02-28 690 2 255 266 6483T 1335440 Baroni 1982 [584,770,1792,1819] Agaricomycetes Tricholomataceae Tricholosporum Fungi Agaricales 2 257 Basidiomycota genus    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. Pileusnon 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.laticifershyphae; 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. Pileusviscid to subviscid....................................................................................................................................................................6   6a. Pileusviscid, surface yellow to lemon yellow, lamellae hygrophanus ..............................................................  T. subgoniospermum  6b. Pileussub-viscid, surface dark vinaceous with dark yellow tinge, lamellae non hygrophanus............................  T. longicystidiosum   7a. Pileusand stipe with violaceous tinge, smoothy and shiny.....................................................................................  T. laeteviolaceum  7b. Pileusand 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. Pileusbluish violet, up to 6 cm, usually tropical...............................................................................................................  T. tropicale  11b. Pileuspale to deep violet, up to 4 cm, usually subtropical to temperate..........................................................................................12   12a. Pileusdeep violaceous lilac, mottled with elongated yellowish-white spots, cystidia long up to 42µm long..............  T. caraibicum  12b. Pileuspale 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. Pileuswithout violaceous tinges, surface viscid, lamellae non hygrophanous .................................................................  T. palmense  15b. Pileuswith 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