Abstract
A new macro-fungal species, described herein as Hymenagaricus siamensis, was collected from northern Thailand during the period from 2020 to 2022. This species is characterized by its small-sized basidiomata, a squamulose pileipellis consisting of pseudoparenchymatous tissue, yellowish-brown basidiospores and an absence of pleurocystidia and clamp connections. However, it is clearly distinguishable from H. nigroviolaceus by the presence of larger basidiospores and smaller pseudoparenchymatous cells in the squamulose pileus. Phylogenetic analysis of internal transcribed spacers (ITS) and large subunit (nrLSU) of the nuclear ribosomal DNA (rDNA) also revealed that the position of H. siamensis is well-supported within the genus Hymenagaricus, but distinct from other sequenced species. A full description, color photographs, illustrations and a phylogenetic tree showing the position of H. siamensis are provided. Comparisons between morphologically similar and related species have also been made and are discussed.
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<p> https://dx.doi.org/10.2307/3667096</p>
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<p>He, M.Q., Zhao, R.L., Hyde, K.D., Begerow, D., Kemler, M., Yurkov, A., McKenzie, E.H.C., Raspé, O., Kakishima, M., Sánchez-Ramírez, S., Vellinga, E.C., Halling, R., Papp, V., Zmitrovich, I.V., Buyck, B., Ertz, D., Wijayawardene, N.N., Cui, B.K., Schoutteten, N., Liu, X.Z., Li, T.H., Yao, Y.J., Zhu, X.Y., Liu, A.Q., Li, G.J., Zhang, M.Z., Ling, Z.L., Cao, B., Antonín, V., Boekhout, T., Da Silva, B.D.B., De Crop, E., Decock, C., Dima, B., Dutta, A.K., Fell, J.W., Geml, J., Ghobad-Nejhad, M., Giachini, A.J., Gibertoni, T.B., Gorjón, S.P., Haelewaters, D., He, S.H., Hodkinson, B.P., Horak, E., Hoshino, T., Justo, A., Lim, Y.W., Menolli Jr, N., Mešić, A., Moncalvo, J.M., Mueller, G.M., Nagy, L.G., Nilsson, R.H., Noordeloos, M., Nuytinck, J., Orihara, T., Ratchadawan, C., Rajchenberg, M., Silva- Filho, A.G.S., Sulzbacher, M.A., Tkalčec, Z., Valenzuela, R., Verbeken, A., Vizzini, A., Wartchow, F., Wei, T.Z., Weiß, M., Zhao, C.L. & Kirk, P.M. (2019) Notes, outline and divergence times of Basidiomycota. <em>Fungal Diversity</em> 99: 105–367. https://doi.org/10.1007/s13225-019-00435-4</p>
<p>Hall, T. (2004) BioEdit. Ibis Therapeutics, Carlsbad, CA, 92008, USA. Available from: http://www.mbio.ncsu.edu/BioEdit/bioedit.html (accessed 31 December 2021)</p>
<p>Heinemann, P. (1956) Champignons récoltés au Congo Belge par Madame M. Goossens-Fontana II. <em>Agaricus</em> Fries s.s. <em>Bulletin du Jardin Botanique de l’État à Bruxelles</em> 26: 1–127.</p>
<p> https://dx.doi.org/10.2307/3667096</p>
<p>Heinemann, P. (1981) <em>Hymenagaricus</em> Heinem. gen. nov. (Agaricaceae). <em>Bulletin du Jardin Botanique National de Belgique</em> 51: 465–466. https://dx.doi.org/10.2307/3668081</p>
<p>Heinemann, P. (1984) <em>Hymenagaricus kivuensis</em> Heinem. sp. nov. <em>Bulletin du Jardin Botanique National de Belgique</em> 54: 290–291. https://dx.doi.org/10.2307/3667880</p>
<p>Heinemann, P. (1985) <em>Hymenagarici novi</em>. <em>Bulletin du Jardin Botanique National de Belgique</em> 55: 492–494. https://dx.doi.org/10.2307/3667969</p>
<p>Heinemann, P. & Little Flower, S.R. (1984) <em>Hymenagaricus</em> (Agaricaceae) de Kerala (Inde) et de Sri Lanka. <em>Bulletin du Jardin Botanique National de Belgique</em> 54: 151–182. https://doi.org/10.2307/3667871</p>
<p>Hillis, D.M. & Bull, J.J. (1993) An empirical test of bootstrapping as a method for assessing confidence in phylogenetic analysis. <em>Systematic Biology </em>42: 182–192. https://doi.org/10.1093/sysbio/42.2.182</p>
<p>Hosen, M.I., Song, Z., Gates, G. & Li, T. (2017a) <em>Xathagaricus careuleus</em>, a new species with ink-blue lamellae from southeast China. <em>Mycoscience</em> 59: 188–192. https://doi.org/10.1016/j.myc.2017.10.003</p>
<p>Hosen, M.I., Song, Z., Gates, G., Karunarathna, S.C., Salahuddin, M., Chowdhuey, M. & Li, T. (2017b) Two new species of <em>Xanthagaricus</em> and some notes on <em>Heinemannomyces</em> from Asia. <em>Mycokeys</em> 28: 1–18. https://dx.doi.org/ 10.3897/mycokeys.28.21029</p>
<p>Hosen, M.I. & Yang, Z.L. (2013) <em>Coniolepiota spongodes</em> (Agaricaceae, Basidiomycota) in Bangladesh and China. <em>Mycotaxon </em>124: 341–347. https://dx<em>.</em>doi.org/10.5248/124.341</p>
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