<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Fusarium houttuyniae Y. K. He, Yong Wang</title> <meta content="text/html; charset=UTF-8" http-equiv="content-type"/> </head> <body> <h2> <i>Fusarium houttuyniae</i> Y. K. He, Yong Wang bis, <i>sp. nov.</i> Fig. 2.</h2> <p>Mycobank: MB846236; FOF number: 14109</p> <p> Etymology:— <i>houttuyniae</i> refers to the host genus <i>Houttuynia</i>, which the holotype was isolated.</p> <p> Holotype:— CHINA, Guangxi Province, Nanning City, Guang Xi Medicinal Botanical Garden, 108°19’ E, 22°51’ N, leaf of <i>Houttuynia cordata</i>, November 2017, collected by Qian Zhang (Collection number: HGUP 10007, culture number: GUCC 21004).</p> <p> Additional specimens examined:— CHINA, Guangxi Province, Nanning City, Guang Xi Medicinal Botanical Garden, 108°19’ E, 22°51’ N, leaf of <i>Houttuynia cordata</i>, November 2017, collected by Qian Zhang (Collection number: HGUP 10007, culture number: GUCC 21008).</p> <p> Description: <b>Colonies</b> on PDA media with an average radial growth rate of 2.1‒3.0 mm/d at 24℃. The colony was white with abundant and flocculent aerial hyphae, but later turned light purple, odour absent. Colony margins regularly. <b>Conidiophores</b> unbranched or sparingly branched, aerial phialides subulate to subcylindrical, straight, thin- and smooth- walled. <b>Microconidia</b> hyaline, ellipsoidal to falcate, smooth- and thin-walled, 0‒1 septate; 0-septate, 4‒10 × 1‒5 (av. 6.4 ± 1.53 × 3.2 ± 1.08) µm or 1-septate, 9‒17 × 2‒6 (av. 13.9 ± 2.11 × 4.3 ± 1.21) µm. <b>Macroconidia</b> formed on aerial mycelium, falcate, curved dorsiventrally with almost parallel sides tapering slightly towards both ends, with a blunt to papillate, curved apical cell and a blunt to foot-like basal cell, hyaline, smooth- and thin-walled, 1‒3 septate; 1-septate conidia: 12‒20 × 2‒5 (av. 16.5 ± 2.1 × 3.5 ± 0.65) µm; 2-septate conidia: 15‒22 × 2‒4 (av. 18.15 ± 1.92 × 3 ± 0.44) µm; 3-septate conidia: 28‒45 × 3‒6 (av. 38.5 ± 3.18 × 4.71 ± 0.7) µm. <b>Chlamydospores</b> globose to sub globose, 4.5‒9 (av. 6.92 ± 1.06) µm diam.</p> <p> Notes: Phylogenetically, <i>F</i>. <i>houttuyniae</i> (GUCC 21004) formed a well-supported, distinct clade sister to <i>F. liriopes</i> (GUCC 21005), and <i>F. nirenbergiae</i> (CBS 129.24) (Fig. 1). Between <i>F. houttuyniae</i> and <i>F. liriopes</i>, there are 6/606 character differences in <i>cmdA</i>, 1/876 character in <i>rpb2</i>, 1/621 character in <i>tef1</i>, and 10/534 characters in <i>tub2</i>. Between <i>F. houttuyniae</i> and <i>F. nirenbergiae</i>, there are 4/606 characters in <i>cmdA</i>, 2/876 characters in <i>rpb2</i>, 7/621 characters in <i>tef1</i> and 12/534 characters in <i>tub2</i> (Table 2). This species (conidia 1‒3-septate) can be distinguished from <i>F. nirenbergiae</i> (0‒5-septate; (Zhao <i>et al.</i> 2020)) based on the septation of the macroconidia. <i>Fusarium houttuyniae</i> differs from <i>F. liriopes</i> by having bigger conidia (<i>F. houttuyniae</i>: 1-septate conidia: 12‒20 × 2‒5 µm; 2-septate conidia: 15‒22 × 2‒4 µm; 3-septate conidia: 28‒45 × 3‒6 µm. <i>vs. F. liriopes</i>: 1-septate conidia: 11‒15 × 2‒3 µm; 2-septate conidia: 14‒22 × 2‒4 µm; 3-septate conidia: 18‒28 × 3‒5 µm.). Thus, we propose <i>F. houttuyniae</i> as a novel species.</p> </body> </html>