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.
References
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Hall, T. (2004) BioEdit. Ibis Therapeutics, Carlsbad, CA, 92008, USA. Available from: http://www.mbio.ncsu.edu/BioEdit/bioedit.html (accessed 31 December 2021)
Heinemann, P. (1956) Champignons récoltés au Congo Belge par Madame M. Goossens-Fontana II. Agaricus Fries s.s. Bulletin du Jardin Botanique de l’État à Bruxelles 26: 1–127.
https://dx.doi.org/10.2307/3667096
Heinemann, P. (1981) Hymenagaricus Heinem. gen. nov. (Agaricaceae). Bulletin du Jardin Botanique National de Belgique 51: 465–466. https://dx.doi.org/10.2307/3668081
Heinemann, P. (1984) Hymenagaricus kivuensis Heinem. sp. nov. Bulletin du Jardin Botanique National de Belgique 54: 290–291. https://dx.doi.org/10.2307/3667880
Heinemann, P. (1985) Hymenagarici novi. Bulletin du Jardin Botanique National de Belgique 55: 492–494. https://dx.doi.org/10.2307/3667969
Heinemann, P. & Little Flower, S.R. (1984) Hymenagaricus (Agaricaceae) de Kerala (Inde) et de Sri Lanka. Bulletin du Jardin Botanique National de Belgique 54: 151–182. https://doi.org/10.2307/3667871
Hillis, D.M. & Bull, J.J. (1993) An empirical test of bootstrapping as a method for assessing confidence in phylogenetic analysis. Systematic Biology 42: 182–192. https://doi.org/10.1093/sysbio/42.2.182
Hosen, M.I., Song, Z., Gates, G. & Li, T. (2017a) Xathagaricus careuleus, a new species with ink-blue lamellae from southeast China. Mycoscience 59: 188–192. https://doi.org/10.1016/j.myc.2017.10.003
Hosen, M.I., Song, Z., Gates, G., Karunarathna, S.C., Salahuddin, M., Chowdhuey, M. & Li, T. (2017b) Two new species of Xanthagaricus and some notes on Heinemannomyces from Asia. Mycokeys 28: 1–18. https://dx.doi.org/ 10.3897/mycokeys.28.21029
Hosen, M.I. & Yang, Z.L. (2013) Coniolepiota spongodes (Agaricaceae, Basidiomycota) in Bangladesh and China. Mycotaxon 124: 341–347. https://dx.doi.org/10.5248/124.341
Hussain, S., Afshan, N., Ahmad, H., Sher, H. & Khalid, A.N. (2017) Xanthagaricus pakistanicus sp. nov. (Agaricaceae): first report of the genus from Pakistan. Turkish Journal of Botany 41: 1–11. https://doi.org/10.3906/bot-1705-21
Hyde, K.D., Hongsanan, S., Jeewon, R., Bhat, D.J., McKenzie, E.H.C., Jones, E.B.G., Phookamsak, R., Ariyawansa, H.A., Boonmee, S., Zhao, Q., Abdel-Aziz, F.A., Abdel-Wahab, M., Banmai, S., Chomnunti, P., Cui, B.K., Daranagama, D.A., Das, K., Dayarathne, M.C., De Silva, N.I., Dissanayake, A.J., Doilom, M., Ekanayaka, A.H., Gibertoni, T.B., Góes-Neto, A., Huang, S.K., Jayasiri, S.C., Jayawardena, R.S., Konta, S., Lee, H.B., Li, W.J., Lin, C.G., Liu, J.K., Lu, Y.Z., Luo, Z.L., Manawasinghe, I.S., Manimohan, P., Mapook, A., Niskanen, T., Norphanphoun, C., Papizadeh, M., Perera, R.H., Phukhamsakda, C., Richter, C., De Santiago, A.L.C.M., Drechsler-Santos, E.R., Senanayake, I.C. & Tanaka, K. (2016) Fungal diversity notes 367–490: taxonomic and phylogenetic contributions to fungal taxa. Fungal Diversity 80: 1–270. https://doi.org/10.1007/s13225-016-0373-x
Jeewon, R. & Hyde, K.D. (2016) Establishing species boundaries and new taxa among fungi: Recommendations to resolve taxonomic ambiguities. Mycosphere 7: 1669–1677. https://doi.org/10.5943/mycosphere/7/11/4
Kirk, P.M., Cannon, P.F., Minter, D. & Stalpers, J.A. (Eds.) (2008) Dictionary of the fungi, 10th ed. CAB International, Wallingford.
Kornerup, A. & Wanscher, J.H. (1978) Methuen handbook of colour, 3rd ed. Eyre Methuen, London, 252 pp.
Kumla, J., Suwannarach, N., Sri-Ngernyuang, K. & Lumyong, S. (2018) Xanthagaricus thailandensis sp. nov. (Agaricales, Basidiomycota), from northern Thailand. Phytotaxa 348 (2): 109–117. https://doi.org/10.11646/phytotaxa.348.2.5
Kumla, J., Suwannarach, N. & Wannathes, N. (2021) Hymenagaricus saisamornae sp. nov. (Agaricales, Basidiomycota) from Northern Thailand. Chiang Mai Journal of Science 48: 827–836.
Little Flower S.R., Hosagoudar, V.B. & Abraham, T.K. (1997) Xanthagaricus, a new generic name in the family Agaricaceae. New Botanist 24: 93–100.
Liu, Y.S., Liu, J.K., Sysouphanthong, P., Hyde, K.D. & Lumyong, S. (2020) Xanthagaricus siamensis sp. nov. (Agaricaceae), a new species with dull green lamellae from northern Thailand. Phytotaxa 437 (1): 14–22. https://doi.org/10.11646/phytotaxa.437.1.2
Liu, Y.S., Kumla, J., Suwannarach, N., Sysouphanthong, P. & Lumyong, S. (2022) Three species of Amanita section Lepidella (Amanitaceae, Agaricales) from northern Thailand. Phytotaxa 570 (1): 16–28. https://doi.org/10.11646/phytotaxa.570.1.2
Mwanga, Z.N. & Tibuhwa, D.D. (2014) Morphology and molecular taxonomy of Hymenagaricus mlimaniensis species nov: a new Basidiomycota mushroom from Mlimani main campus, Tanzania. Journal of Yeast and Fungal Research 5: 96–102. https://doi.org/10.5897/JYFR2014.0144
Pegler, D.N. (1977) A preliminary agaric flora of East Africa. Kew Bulletin Additional Series 6: 1–615.
Pegler, D.N. (1986) Agaric flora of Sri Lanka. Kew Bulletin Additional Series XII. Her Majesty’s Stationery Office, London.
Reid, D.A. & Eicker, A. (1995) The genus Hymenagaricus Heinem. in South Africa. South African Journal of Botany 61: 293–297. https://doi.org/10.1016/S0254-6299(15)30549-4
Reid, D.A. & Eicker, A. (1998) South African Fungi 8. Three new species of Hymenagaricus from South Africa, with a revised key to South African taxa. South African Journal of Botany 64: 256–360. https://doi.org/10.1016/S0254-6299(15)30924-8 https://dx.doi.org/10.1016/S0254-6299(15)30924-8
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