identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
63BE31AA8667513DA072E6C7143605B3.text	63BE31AA8667513DA072E6C7143605B3.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Micropsalliota latiumbonata S. Hussain, Al-Nadabi & Al-Sadi 2026	<div><p>Micropsalliota latiumbonata S. Hussain, Al-Nadabi &amp; Al-Sadi sp. nov.</p><p>Figs 2, 3</p><p>Etymology.</p><p>The specific epithet ‘ latiumbonata’ refers to the broadly umbonate pileus disc of the new species.</p><p>Diagnosis.</p><p>Micropsalliota latiumbonata is a very small-sized species, characterized by a broadly umbonate pileus center, occurring gregariously in a specific habitat of termite mounds, and microscopically with olivaceous capitulum at the apex of cheilocystidia.</p><p>Holotype. •</p><p>Sultanate Of Oman: Dhofar, Salalah, Ashwur, on soil with grasses on termite mounds, 28 August 2025, S. Hussain, Al-Nadabi, A. Al Sidairi, K. Al-Zeidi &amp; A. Al-Raeesi, ASH-007-25 (CESAR -ASH-007-25, holotype), GenBank accession: ITS = PZ 127413, 28 S = PZ 127516, tef 1-α = PZ 386150 .</p><p>Description.</p><p>Basidiomata small-sized. Pileus 10–18 mm, at young stage campanulate to hemispherical, becoming convex to plano-convex at mature stage, finally becoming plano-concave to concave in old specimens, with broadly umbonate disc; surface fibrillose-squamulose, fibrils more or less recurved, reddish-brown (10 R 5 / 4–2.5 YR 6 / 4) to dark reddish-brown (10 R 3 / 10–10 R 3 / 14), concentrated at the center, sparser towards the margins; margin appendiculate, whitish; in old specimens the entire basidiomata becoming dark-brown (5 YR 1 / 2–7.5 YR 1 / 2). Context membranous, whitish. Lamellae free, pale pinkish (10 R 9 / 2–7.5 YR 9 / 2) to dark grayish-brown (2.5 YR 1 / 4–7.5 R 2 / 4), broad to ventricose, with fimbriate edge, close with 0–3 series of lamellulae. Stipe 15–30 × 2–3 mm, central, cylindrical, slender, white, surface pruinose to furfuraceous downwards. Context of stipe secreting brownish red (5 R 3 / 10–7.5 R 3 / 10) liquid in some specimens on cutting. Annulus cortinate, whitish.</p><p>Basidiospores [141 / 2 / 2] (4.5) 6.0–7.0 (7.8) × (3.5) 4.0–4.5 (4.7) µm, on average 6.5 × 4.2 µm, Q = 1.4–1.7, av. Q = 1.6, in face view broadly fusiform with a truncate apex, in side view oblong to amygdaliform with slightly flattened on one side, pale brownish, slightly thick-walled, with a prominent apiculus, without germ-pore. Basidia 18–23 × 7.0–8.0 µm, clavate, hyaline, 4 - spored, rarely 2 - spored. Pleurocystidia absent. Cheilocystidia 32–46 × 9.0–12 µm, hyaline, narrowly utriform to tibiiform capitate apex, capitulum 5–8 µm in diam, smooth, with olivaceous content. Pileus squamules is a cutis, consisting of hyphae 11–15 µm in diam, pale brownish, smooth, cylindrical to elongated, constricted at septa, rarely branched. Caulocystidia 46–88 × 8.0–12 µm, tibiiform to cylindrical, with capitate apex, hyaline. Clamp connection absent in all tissues.</p><p>Habit, habitat and distribution.</p><p>Gregarious or scattered in small groups, saprotrophic, on the soil of a termite mound. Currently only known from southern Oman.</p><p>Additional specimens examined.</p><p>• Sultanate Of Oman: Dhofar, Salalah, Qashrub, on soil under herbaceous plants, 27 August 2025, S. Hussain, Al-Nadabi, K. Al-Zeidi &amp; A. Al-Raeesi, QRB-14-25 (paratype CESAR -QRB-14-25), GenBank accession: ITS = PZ 127411, 28 S = PZ 127514, tef 1-α = PZ 390627 ; Salalah, Ashwur, on soil with grasses on termite mounds, 28 August 2025, S. Hussain, Al-Nadabi, A. Al Sidairi, K. Al-Zeidi &amp; A. Al-Raeesi, ASH-005-25 (paratype CESAR -ASH-005-25), GenBank accession: ITS = PZ 127410, 28 S = PZ 127513, tef 1-α = PZ 390625 ; same area and same date, S. Hussain, Al-Nadabi, A. Al Sidairi, K. Al-Zeidi &amp; A. Al-Raeesi, ASH-006-25 (paratype CESAR -ASH-006-25), GenBank accession: ITS = PZ 127412, 28 S = PZ 127515, tef 1-α = PZ 390626; same area and same date, S. Hussain, Al-Nadabi, A. Al Sidairi, K. Al-Zeidi &amp; A. Al-Raeesi, ASH-009-25 (paratype CESAR -ASH-009-25), GenBank accession: ITS = PZ 127414, 28 S = PZ 127517, tef 1-α = PZ 176529 .</p><p>Note.</p><p>The new species Micropsalliota latiumbonata can be recognized by its growing habit, which mainly fruits on a termite mound; pileus with a broadly umbonate center, covered with reddish-brown squamules; and capitate cheilocystidia, with the capitulum containing olivaceous material. There are several species in the genus with a similar combination of characteristics, such as M. albosericea Heinem. &amp; Leelav., M. ferruginea T. Gao &amp; Z. W. Ge, M. fimbriata T. Gao &amp; Z. W. Ge, M. gracilis Heinem., M. longicystis T. Gao &amp; Z. W. Ge, M. nana T. Gao, H. Qu &amp; Z. W. Ge. Micropsalliota albosericea has a whitish fibrillose pileus, basidiospores ovoid or cymbiform with apical thickening and smaller (5–5 × 2.8–3.2 µm), utriform cheilocystidia with capitate apex and hyaline (Heinemann and Leelavathy 1991). Micropsalliota ferruginea was recently reported from China, with a larger pileus (35–50 mm diam), covered with recurved squamules, without a prominent umbo, and smaller cheilocystidia (15–33 × 3–10 µm) with hyaline capitulum (Gao et al. 2024). Similarly, M. gracilis with an umbonate pileus center, covered with brownish-red squamules, basidiospores amygdaliform to ellipsoid and smaller (5.5–6.5 × 3.0–4.0 µm), ventricose to irregularly tibiiform cheilocystidia with hyaline capitate apex (Zhao et al. 2010). Micropsalliota longicystis shares capitate caulo- and cheilocystidia with the new species; however, it is differentiated from M. latiumbonata by its smaller basidiospores (5.0–6.0 × 3.0–3.5 µm), hyaline capitulum of cheilocystidia, and the presence of pleurocystidia (Gao et al. 2024). Micropsalliota nana differentiated from the new species by its silky fibrillose pileus with obtuse umbo, persistent annulus, basidiospores smaller (4.5–6.0 × 3.0–4.0 µm) ellipsoid to amygdaliform, hyaline capitulum of cheilocystidia, with encrusted hyphae in pileus squamules (Gao et al. 2024).</p><p>Based on multigene phylogeny, the close relatives of Micropsalliota latiumbonata are M. appendiculata D. D. Ivanova &amp; O. V. Morozova, M. megaspora R. L. Zhao, Desjardin, Soytong &amp; K. D. Hyde, M. repanda Heinem., M. jiangxiensis X. H. Ji &amp; G. He, M. ferruginea, and the proposed new species M. striata sp. nov. Micropsalliota appendiculata has been reported from China and Vietnam under broad-leaved trees, with pyriform to subglobose cheilocystidia, presence of pleurocystidia (broadly clavate to clavate-capitate), with encrusted hyphae of pileus squamules (Gao et al. 2024). Micropsalliota megaspora can be differentiated from the new species by its larger basidiospores (6–8 × 3.8–4.5 µm), ventricose cheilocystidia with hyaline, subcapitate apices, and incrusted hyphae in pileus squamules (Zhao et al. 2010). Basidiomata of Micropsalliota repanda are comparatively larger (pileus diam up to 45 mm), with purplish-red pileal squamules, capitate hyaline (Heinemann 1980). Micropsalliota jiangxiensis with pileus 25–32 mm diam, covered with wood-brown fibrils, basidiospores 5.3–6.7 × 2.9–3.4 µm, ellipsoid, cheilocystidia cylindrical to subclavate with capitate apex, hyaline (Ji and He 2023).</p><p>Nucleotide differences in the ITS region of both the new species ( Micropsalliota latiumbonata, M. striata) with their close relative M. appendiculata is given in Table 2.</p></div>	https://treatment.plazi.org/id/63BE31AA8667513DA072E6C7143605B3	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Pensoft via Plazi	Al-Nadabi, Hamed;Hussain, Shah;Al Sidairi, Ahmed;Al-Zeidi, Khalifa;Al-Raeesi, Ahmed;Al-Badi, Rahil;Al-Rashdi, Lujain;Al-Jashmi, Jumana;Velazhahan, Rethinasamy;Al-Sadi, Abdullah M.	Al-Nadabi, Hamed, Hussain, Shah, Al Sidairi, Ahmed, Al-Zeidi, Khalifa, Al-Raeesi, Ahmed, Al-Badi, Rahil, Al-Rashdi, Lujain, Al-Jashmi, Jumana, Velazhahan, Rethinasamy, Al-Sadi, Abdullah M. (2026): Morphology and multigene phylogeny reveal two new species of Micropsalliota (Agaricaceae, Basidiomycota) from Dhofar region, southern Oman. MycoKeys 137: 317-336, DOI: 10.3897/mycokeys.137.192271
3039901BED865E12BF2442CCFD9BD4C2.text	3039901BED865E12BF2442CCFD9BD4C2.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Micropsalliota striata S. Hussain, Al-Nadabi & Al-Sadi 2026	<div><p>Micropsalliota striata S. Hussain, Al-Nadabi &amp; Al-Sadi sp. nov.</p><p>Figs 2, 4</p><p>Etymology.</p><p>The specific epithet ‘ striata’ refers to the fine striate pileus margin of the new species.</p><p>Diagnosis.</p><p>Micropsalliota striata is a small-sized species characterized by a striate pileus margin, a papillate disc, microscopically with the presence of pileocystidia and caulocystidia.</p><p>Holotype.</p><p>• Sultanate Of Oman: Dhofar, Salalah, Ain Athum, on moist soil with mosses, 25 August 2025, S. Hussain, Al-Nadabi, A. Al Sidairi, K. Al-Zeidi &amp; A. Al-Raeesi, ATM-009-25 (CESAR -ATM-009-25, holotype), GenBank accession: ITS = PZ 127415, 28 S = PZ 127518 .</p><p>Description.</p><p>Basidiomata small-sized. Pileus 15–20 mm, at young stage paraboloid to hemispherical, becoming convex to plano-convex and applanate at mature stage, with acute papillate disc; surface fibrillose, fibrils appressed, sparse towards the margin, light-pinkish (2.5 R 9 / 4–10 RP 9 / 4) to light yellowish-pink (7.5 R 9 / 4–7.5 R 9 / 6), concentrated at the disc, light-brown (5 YR 4 / 4–7.5 YR 4 / 4) to reddish-brown (10 R 5 / 4–2.5 YR 6 / 4); margins finely striate, exceeding the lamellae, appendiculate, whitish. Context membranous, whitish. Lamellae free, pale pinkish (10 R 9 / 2–7.5 YR 9 / 2) to light reddish-brown (2.5 YR 5 / 4–2.5 YR 6 / 4), ventricose, with fimbriate edge, close with 1–3 series of lamellulae. Stipe 25–40 × 2–3 mm, central, equal, slightly flexuous, slender, pale-pinkish (2.5 YR 9 / 2–7.5 R 9 / 2) to pale-brownish (10 R 5 / 4–10 R 6 / 4), surface pruinose to pulverulent downwards, glabrous upwards. Context of stipe unchanging on bruising or cutting. Annulus absent.</p><p>Basidiospores [104 / 2 / 1] (6.2) 6.5–7.5 (8.3) × (3.5) 3.7–4.1 (4.5) µm, on average 7.0 × 3.9 µm, Q = 1.6–1.8, av. Q = 1.7, in face view oblong to broadly fusiform with truncate apex, in side view amygdaliform to ellipsoid with slightly flattened on one side, pale brownish, slightly thick-walled, with prominent apiculus, without germ-pore. Basidia 14–17 × 5.5–7.0 µm, clavate to cylindrical, hyaline, regularly 4 - spored. Pleurocystidia 28–36 × 9.5–11.5 µm, oblong to clavate or narrowly utriform to cylindrical, abundant, hyaline. Cheilocystidia 23–30 × 8.5–11.5 µm, narrowly utriform to utriform without a capitate apex, hyaline. Pileus squamules is a cutis, consisting of encrusted hyphae, 10–25 µm in diam, pale brownish, cylindrical to elongated, constricted at septa, rarely branched. Pileipellis is a hymeniderm to epithelium, consisting of subglobose to clavate pileocystidia, measuring 11.5–20.5 × 7.0–10.5 µm, hyaline, smooth. Caulocystidia 40–51 × 8.5–10 µm, clavate to cylindrical or cylindro-clavate, without a capitate apex, hyaline. Clamp connection absent in all tissues.</p><p>Habit, habitat and distribution.</p><p>Gregarious or scattered in small groups, saprotrophic, on moist soil with mosses. Currently only known from southern Oman.</p><p>Note.</p><p>The new species Micropsalliota striata is characterized by its acute papillate pileus disc, with striate pileus margins, having clavate to cylindrical caulocystidia, narrowly utriform to utriform pleuro- and cheilocystidia without a capitate apex, and comparatively larger basidiospores (6.5–7.5 × 3.7–4.1 µm) than M. latiumbonata . In the genus, there are several species with similar kind of characteristics, like: M. appendiculata, M. gigaspora T. Gao &amp; Z. W. Ge, M. pileocystidiata P. B. Patil &amp; S. A. Vaidya, M. pleurocystidiata Heinem. &amp; Little Flower, M. pseudoarginea Heinem. and M. xanthorubescens Heinem. Micropsalliota appendiculata can be differentiated from the new species by its pyriform to subglobose cheilocystidia measuring (16–25 × 10–13 µm), pleurocystidia broadly clavate to clavate-capitate, pileipellis without pileocysidia (Gao et al. 2024). Micropsalliota gigaspora with a subumbonate to applanate pileus disc with crenate margins, stipe with a persistent annulus, lengthy basidiospores (7–9 × 4–5.5 µm), broadly-clavate to clavate cheilocystidia, and 2 - and 4 - spored basidia (Gao et al. 2024). Micropsalliota pileocystidiata, only known from the type location (Maharashtra, India), is a medium- to large-sized species with pyriform pileocystidia (Patil et al. 2022). Micropsalliota pleurocystidiata is a large-sized species, with a broadly umbonate pileus disc, basidiospores amygdaliform and smaller (5.0–6.0 × 3.0–4.0 µm), broadly ventricose to subcylindrical cheilocystidia (Zhao et al. 2010). Micropsalliota pseudoarginea with glabrous to finely pruinose cap surface, smaller basidiospores (4.0–5.0 × 2.5–3.2 µm), ellipsoid to subcymbiform shape, with clavate to ventricose cheilocystidia (Zhao et al. 2010). Micropsalliota xanthorubescens is a medium-sized species with a subumbonate pileus disc, clavate to ventricose cheilocystidia (Zhao et al. 2010).</p><p>Both the newly proposed species, Micropsalliota striata and M. latiumbonata, can be differentiated by several characteristics. Pileus disc in the former is acute papillate as compared to the broadly umbonate disc in the latter; the cap surface is sparsely covered with pinkish, appressed fibrils in M. striata, in contrast to much denser, recurved, and brownish fibrils in M. latiumbonata . Pleurocystidia and pileocystidia are completely absent in M. latiumbonata . Cheilocystidia in M. striata are without a prominent capitate apex; however, the cheilocystidia of M. latiumbonata have a characteristic capitulum with olivaceous content.</p></div>	https://treatment.plazi.org/id/3039901BED865E12BF2442CCFD9BD4C2	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Pensoft via Plazi	Al-Nadabi, Hamed;Hussain, Shah;Al Sidairi, Ahmed;Al-Zeidi, Khalifa;Al-Raeesi, Ahmed;Al-Badi, Rahil;Al-Rashdi, Lujain;Al-Jashmi, Jumana;Velazhahan, Rethinasamy;Al-Sadi, Abdullah M.	Al-Nadabi, Hamed, Hussain, Shah, Al Sidairi, Ahmed, Al-Zeidi, Khalifa, Al-Raeesi, Ahmed, Al-Badi, Rahil, Al-Rashdi, Lujain, Al-Jashmi, Jumana, Velazhahan, Rethinasamy, Al-Sadi, Abdullah M. (2026): Morphology and multigene phylogeny reveal two new species of Micropsalliota (Agaricaceae, Basidiomycota) from Dhofar region, southern Oman. MycoKeys 137: 317-336, DOI: 10.3897/mycokeys.137.192271
