Morphology and multi-gene phylogeny reveal a new fungal genus and species from Hevea brasiliensis latex in Yunnan, China Author Xu, Ruifang 0000-0003-2170-5811 Center for Mountain Futures, Kunming Institute of Botany, Kunming 650201, Yunnan, P. R. China. & Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand. & CIFOR-ICRAF China Program, World Agroforestry (ICRAF), Kunming 650201, Yunnan, P. R. China. & School of Science, Mae Fah Luang University, Chiang Rai, 57100, Thailand. & 2417745253 @ qq. com; https: // orcid. org / 0000 - 0003 - 2170 - 5811 2417745253@qq.com Author Hyde, Kevin D. 0000-0002-3407-9517 Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand. & School of Science, Mae Fah Luang University, Chiang Rai, 57100, Thailand. & Innovative Institute of Plant Health, Zhongkai University, Guangdong, P. R. China. & kdhyde 3 @ gmail. com; https: // orcid. org / 0000 - 0002 - 3407 - 9517 kdhyde3@gmail.com Author Karunarathna, Samantha C. 0000-0001-7080-0781 Center for Mountain Futures, Kunming Institute of Botany, Kunming 650201, Yunnan, P. R. China. & CIFOR-ICRAF China Program, World Agroforestry (ICRAF), Kunming 650201, Yunnan, P. R. China. & samantha @ mail. kib. ac. cn; https: // orcid. org / 0000 - 0001 - 7080 - 0781 samantha@mail.kib.ac.cn Author Xu, Jian-Chu 0000-0002-2485-2254 Center for Mountain Futures, Kunming Institute of Botany, Kunming 650201, Yunnan, P. R. China. & CIFOR-ICRAF China Program, World Agroforestry (ICRAF), Kunming 650201, Yunnan, P. R. China. & jxu @ mail. kib. ac. cn; https: // orcid. org / 0000 - 0002 - 2485 - 2254 jxu@mail.kib.ac.cn Author Mortimer, Peter E. 0000-0003-3188-9327 Center for Mountain Futures, Kunming Institute of Botany, Kunming 650201, Yunnan, P. R. China. & CIFOR-ICRAF China Program, World Agroforestry (ICRAF), Kunming 650201, Yunnan, P. R. China. & peter @ mail. kib. ac. cn; https: // orcid. org / 0000 - 0003 - 3188 - 9327 peter@mail.kib.ac.cn Author Tibpromma, Saowaluck 0000-0002-4706-6547 Center for Mountain Futures, Kunming Institute of Botany, Kunming 650201, Yunnan, P. R. China. & CIFOR-ICRAF China Program, World Agroforestry (ICRAF), Kunming 650201, Yunnan, P. R. China. & saowaluckfai @ gmail. com; https: // orcid. org / 0000 - 0002 - 4706 - 6547 saowaluckfai@gmail.com text Phytotaxa 2022 2022-01-06 530 1 65 76 journal article 2741 10.11646/phytotaxa.530.1.5 f07998af-afc0-43a8-b601-a3017045edb1 1179-3163 5823947 Heveicola xishuangbannaensis R.F. Xu, K.D. Hyde & Tibpromma , sp. nov. ( Fig. 2 ) Index Fungorum Number: IF558799 ; Facesoffungi Number: FOF10491 FIGURE 2. Heveicola xishuangbannaensis (HKAS 115759, holotype ). A–C.Appearance of colonies on the substrate.D, E. Conidiophores with conidia. F–O. Conidia . Scale bars: D–F = 50 μm, G–I, K, L = 10 μm, J, M–O = 30 μm. Holotype :— HKAS 115759 Etymology:— named after the location Xishuangbanna where the fungus was first discovered. Saprobic on rubber latex of Hevea brasiliensis . Sexual morph : Undetermined. Asexual morph : Hyphomycetous. Colonies on natural substrate consisting of long, effuse, dark synnemata, scattered, somewhat hairy, mass of spores all over the surface. Synnemata 850–1000 × 90–135 μm (x̅=943 × 112 μm, n=6), consisting of pale brown to dark brown, cylindrical, septate, unbranched, smooth-walled conidiophores. Conidia 15–40 × 5–8 μm (x̅=26.6 × 6.5 μm, n=20), catenate, cylindrical, 0–4 to multiseptate (on PDA, conidia up to 20-septate), slightly constricted at median septum, rounded at both ends, formed in acropetal chains, initially hyaline, then pale brown to brown, often with a dark brown band at the septa, guttulate, thick- and rough-walled. Culture characteristics:— cultures on PDA, colonies slow growing, umbonate, curled, smooth, edges brown, dark brown, mycelia 2.5–6 μm wide, hyaline, septate, conidia 10–70 × 5–12 μm (x̅=27.7 × 6.8 μm, n=30), oblong, up to 20-septate, pale brown to brown, thick- and rough-walled ( Fig. 3 ). Material examined:— CHINA . Yunnan Province : Xishuangbanna Tropical Botanical Garden , on old rubber latex (oozing from the trunk) of Hevea brasiliensis Müll.Arg. , 24 November 2020 , Ruifang Xu , XSBNR-07 ( HKAS 115759 , holotype ); ex-type living cultures KUMCC 21-0086 . Notes : — In the phylogenetic analyses Heveicola xishuangbannaensis forms a monophyletic branch within Wiesneriomycetaceae with strong statistical support ( Fig. 1 ). Heveicola xishuangbannaensis is similar to Speiropsis and Phalangispora in the shape and colour of the conidia, but it can differ in having a dark brown band at the septa and branches. No sexual morph has been reported so far in Wiesneriomycetaceae .