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<p><i>Hymenagaricus</i> is a group of small-sized, saprotrophic, veiled agaric, in the family <i>Agaricaceae</i>, with nearly 30 species, mainly distributed in paleotropical regions. The fruiting habit in <i>Hymenagaricus</i> is usually gregarious, occurring in large groups, on humus-rich soil, under forest trees. In this study, we reported two new species in the genus, namely, <i>Hymenagaricus arabicae</i> and <i>H. lanosus</i>, from Dhofar region, southern Oman. Both species are small-sized mushrooms, gregariously occurring on termite mounds. <i>Hymenagaricus arabicae</i> is characterized by a broadly umbonate center, which is covered with a smooth, dark-brown to blackish pellicle, composed of a hymeniform structure, with dark-brown to blackish and thick-walled veil elements. <i>Hymenagaricus lanosus</i> has small to slightly medium basidiomata, covered with whitish, woolly veil at the young stage; at the mature stage, the veil from the stem can easily be removed on handling and is characteristically noted for forked-shaped cheilocystidia. Species descriptions are based on morphological characterization of basidiomata and multigene phylogenetic analyses of internal transcribed spacer (ITS1-5.8S-ITS2 = ITS), D1/D2 domains of large subunit of nuclear ribosomal DNA (28S), and translation elongation factor one alpha (<i>EF-1α</i>) gene. Photographs of basidiomata, illustrations of microscopic features, and phylogenetic trees based on ITS and multigene sequence data are provided.</p>

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Description of two new species of Hymenagaricus (Agaricaceae, Basidiomycota) occurring on termite mounds in Dhofar, Southern Oman

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  • 发表日期：

    2026年4月7日

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  • Shah Hussain,
  • Hamed Al-Nadabi,
  • Ahmed Al Sidairi,
  • Khalifa Al-Zeidi,
  • Ahmed Al-Raeesi,
  • Raheel Al-Badi,
  • Lujain Al-Rashdi,
  • Jumana Al-Jashmi,
  • Rethinasamy Velazhahan,
  • Abdullah M. Al-Sadi

摘要

Hymenagaricus is a group of small-sized, saprotrophic, veiled agaric, in the family Agaricaceae, with nearly 30 species, mainly distributed in paleotropical regions. The fruiting habit in Hymenagaricus is usually gregarious, occurring in large groups, on humus-rich soil, under forest trees. In this study, we reported two new species in the genus, namely, Hymenagaricus arabicae and H. lanosus, from Dhofar region, southern Oman. Both species are small-sized mushrooms, gregariously occurring on termite mounds. Hymenagaricus arabicae is characterized by a broadly umbonate center, which is covered with a smooth, dark-brown to blackish pellicle, composed of a hymeniform structure, with dark-brown to blackish and thick-walled veil elements. Hymenagaricus lanosus has small to slightly medium basidiomata, covered with whitish, woolly veil at the young stage; at the mature stage, the veil from the stem can easily be removed on handling and is characteristically noted for forked-shaped cheilocystidia. Species descriptions are based on morphological characterization of basidiomata and multigene phylogenetic analyses of internal transcribed spacer (ITS1-5.8S-ITS2 = ITS), D1/D2 domains of large subunit of nuclear ribosomal DNA (28S), and translation elongation factor one alpha (EF-1α) gene. Photographs of basidiomata, illustrations of microscopic features, and phylogenetic trees based on ITS and multigene sequence data are provided.