taxonID	type	description	language	source
795F87DA7357FF99FF3870EDFA9106B3.taxon	materials_examined	Holotype: HKAS 135175 Etymology: — The species epithet refers to the host genus where the fungus was collected. Saprobic on decaying branches of a Pinus sp. Sexual morph: not observed. Asexual morph: hyphomycetous. Colonies on branches effuse, scattered, hairy, brown or dark brown, glistening. Conidiophores 69 – 124 × 3.5 – 7 µm (x = 94.18 × 4.9 µm, n = 15) wide, macronematous, mononematous, solitary, cylindrical, straight or slightly curved, brown or dark brown, unbranched, 3 – 8 - septate, smooth, slightly tapering towards the apex, rounded at the apex, truncate at the apex. Conidiogenous cells 15 – 21 × 3 – 5 µm (x = 18.29 × 4.22 µm, n = 10), integrated, terminal, monoblastic, percurrent, pale brown, cylindrical. Conidia 22 – 45 × 5 – 10 µm (x = 34.75 × 7.30 µm, n = 30), acrogenous, solitary, smooth, obclavate, straight or slightly curved, tapering to the apex, 3 – 6 - euseptate, becoming brown to pale towards the apex, truncate at the base. Culture characteristics: — Conidia germinated on PDA medium within 24 h. Colonies on PDA medium reaching 30 mm in diameter after 5 weeks at 25 ° C in dark, circular, pale to dark green on the surface, with dense, velvety aerial mycelium; on reverse, circular, dark green in the central region and becoming pale green towards margin, with growing rings, with entire margin. Material examined: — CHINA. Sichuan Province, Neijiang City, Shuangqiao Town, 102 ° 9 ' 58 " E, 29 ° 48 ' 1 " N, elevation 301.35 m, on decaying branches of the pini woody plant, 01 April 2023, W. H. Tian, SQZ 05 _ 3 (HKAS 135175, holotype), ex-type culture UESTCC 24.0131. Notes: — In the multi-locus phylogenetic tree, our new strain UESTCC 24.0131 is phylogenetically closely related to the ex-type strains of K. aquatica (MFLUCC 16 - 1685) and K. cangshanensis (MFLUCC 16 - 1350). However, our isolate can be differentiated from K. aquatica and K. cangshanensis by differences in the ITS barcode, with sequence identities 93.89 % (461 / 491, 4 gaps) and 92.08 % (442 / 480, 4 gaps), respectively. Morphologically, our collection can be distinguished from K. aquatica and K. cangshanensis. The conidiophores of our collection (69 – 124 × 3.5 – 7 μm) are comparatively shorter and narrower than K. aquatica (114 – 151 × 7 – 8 μm) and are shorter than those of K. cangshanensis (105.5 – 135.5 μm). The conidia of our collection are similar to K. aquatica and K. cangshanensis. Nevertheless, the conidia of K. aquatica are thick-walled and rounded at the apex, and K. cangshanensis with a gelatinous sheath at the apex (Bao et al. 2018). Therefore, we introduce UESTCC 24.0127 as a new species.	en	Jin, Yan, Chen, Yanpeng, Liu, Wenhui Tian Jian-Kui, Maharachchikumbura, Sajeewa S. N. (2024): Two novel species of Kirschsteiniothelia from Sichuan Province, China. Phytotaxa 664 (2): 98-110, DOI: 10.11646/phytotaxa.664.2.2, URL: https://doi.org/10.11646/phytotaxa.664.2.2
795F87DA7357FF9BFF387535FD6E051F.taxon	materials_examined	Holotype: — HKAS 134908 Etymology: — The epithet “ sichuanensis ” refers to the province where the fungus was collected. Saprobic on decaying branches of an unidentified woody plant. Sexual morph: not observed. Asexual morph: Colonies on branches effuse, scattered, hairy, brown or dark brown, glistening. Conidiophores 82 – 194 × 5 – 10 µm (x = 137 × 7 µm, n = 15) wide, macronematous, mononematous, solitary, cylindrical, straight or slightly curved, brown or dark brown, unbranched, 4 – 8 - septate, smooth, slightly tapering towards the apex, rounded at the apex, truncate at the apex. Conidiogenous cells 10 – 22 × 6 – 9 µm (x = 17.67 × 7.48 µm, n = 20) integrated, terminal, monoblastic, percurrent, pale brown, cylindrical. Conidia 34 – 54 × 8 – 14 µm (x = 39 × 11 µm, n = 30), acrogenous, solitary, smooth, obclavate, straight or slightly curved, tapering to the apex, 2 – 7 euseptate, becoming brown to pale towards the apex, truncate at the base. Culture characteristics: — Conidia germinated on PDA within 24 h. Colonies on PDA reaching 20 mm in diam. after 2 weeks at 25 ° C in dark, circular, pale to dark green on the surface, with dense, velvety aerial mycelium; on reverse side black, circular, with entire margin. Material examined: — CHINA. Sichuan Province, Aba Tibetan and Qiang Autonomous Prefecture, Wenchuan County, Yamen Town, Xiqiang Grand Canyon, 103 ° 36 ' 27 " E, 31 ° 27 ' 53 " N, elevation 2143 m, on decaying branches of an unidentified woody plant, 20 October 2021, Y. P. Chen, XQ 30.1 (HKAS 134908, holotype), ex-type culture UESTCC 24.0127. Notes: — In the multi-locus phylogenetic tree, the newly collected isolate UESTCC 24.0127 formed a sister clade close to the K. extensum (MFLU 21 - 0130). However, they differ in both morphological characteristics and molecular data. The conidia of UESTCC 24.0127 are shorter than those of K. extensum (34 – 54 vs. 45 – 120 µm), and the ITS sequence identity between them is only 94.92 % (448 / 472, 2 gaps) (Jayawardena et al. 2022). Therefore, we identified Kirschsteiniothelia sichuanensis as a new species.	en	Jin, Yan, Chen, Yanpeng, Liu, Wenhui Tian Jian-Kui, Maharachchikumbura, Sajeewa S. N. (2024): Two novel species of Kirschsteiniothelia from Sichuan Province, China. Phytotaxa 664 (2): 98-110, DOI: 10.11646/phytotaxa.664.2.2, URL: https://doi.org/10.11646/phytotaxa.664.2.2
