Trichoderma xixiacum Jing Z. Sun & X.Z. Liu, 2020

Gu, Xin, Wang, Rui, Sun, Quan, Wu, Bing & Sun, Jing-Zu, 2020, Four new species of Trichoderma in the Harzianum clade from northern China, MycoKeys 73, pp. 109-132 : 109

publication ID

https://dx.doi.org/10.3897/mycokeys.73.51424

persistent identifier

https://treatment.plazi.org/id/E6B880C9-D090-5DE6-A633-F72AFF924701

treatment provided by

MycoKeys by Pensoft

scientific name

Trichoderma xixiacum Jing Z. Sun & X.Z. Liu
status

sp. nov.

Trichoderma xixiacum Jing Z. Sun & X.Z. Liu sp. nov. Fig. 4 View Figure 4

Etymology.

Latin, xixiacum , refers to the type locality.

Type.

China. Xixia District, Yinchuan, Ningxia Hui Autonomous Region, 38°38'52"N, 106°9'33"E, ca. 1127 m elev., from rhizosphere soil of Lycium chinois , 17 Oct 2018, Jing Z. Sun (HMAS 248253, holotype), ex-type culture CGMCC 3.19697.

Description.

On CMD after 72 h, colony radius 55-56 mm at 25 °C, covering the plate at 30 °C, 9-11 mm at 35 °C. Colony hyaline, indistinctly zonate, mycelia loose. Aerial hyphae short, inconspicuous. No diffusing pigment, not distinct odor (Fig. 4B View Figure 4 ). Conidial production noted after 3 days, effuse in aerial hyphae, becoming blue-green after 4 days. Chlamydospores unobserved.

On PDA after 72 h, colony radius 59-60 mm at 25 °C, covering the plate at 30 °C, 7-8 mm at 35 °C. Colony white to yellow-white, regularly circular, indistinctly zonate; mycelium dense and radial. Aerial hyphae conspicuous. No diffusing pigment, not distinct odor (Fig. 4A View Figure 4 ). Conidial production noted after 3 days, starting around the original inoculum, effuse in the aerial hyphae, first white, turning blue-green after 7 d. Chlamydospores unobserved.

On SNA after 72 h, colony radius 51-52 mm at 25 °C, 52-53 mm at 30 °C, 4-5 mm at 35 °C. Colony hyaline, indistinctly zonate; mycelium loose, especially at the margin. Aerial hyphae short. No diffusing pigment, not distinct odor (Fig. 4C View Figure 4 ). Conidial production noted after 2 days, starting around the inoculum, effuse in the aerial hyphae. Small pustules formed around the inoculum, first white, turning green after 3 d, with hairs protruding beyond the surface. Conidiophores pyramidal with opposing branches, less frequently solitary, closely-spaced branches, each branch, and the main axis terminating in 2-5 cruciately to nearly verticillately disposed phialides (Fig. 4F, G, I View Figure 4 ). Phialides ampulliform to lageniform, often constricted below the tip to form a narrow neck, hyaline, (3.2-)3.5-7.0(-9.3) × (2.3-)2.6-3.3(-3.6) µm (x̄ = 5.0 × 3.0 μm, n = 50), length/width ratio (1.2-)1.5-2.5(-4) (x̄ = 1.8, n = 50), base 1.6-2.2 μm (x̄ = 1.8 μm, n = 50) (Fig. 4I View Figure 4 ). Conidia subglobose to globose, smooth, hyaline when young, becoming green to dark green with age, (2.0-)2.3-2.7(-3.0) × (1.6-)2.0-2.6(-3.0) µm (x̄ = 2.5 × 2.2 μm, n = 50), length/width ratio 1.0-1.3(-1.7) (x̄ = 1.1, n = 50) (Fig. 4H View Figure 4 ). Chlamydospores unobserved. No odor; no diffusing pigment observed.

Additional specimen examined.

China. Xixia District, Yinchuan, Ningxia Hui Autonomous Region, 38°38'52"N, 106°9'33"E, ca. 1127 m elev., from rhizosphere soil of Lycium chinois , 17 Oct 2018, Jing Z. Sun, living CGMCC 3.19697.

Teleomorph.

Undetermined.

Note.

Characterized by tree-like conidiophores, verticillate or in whorls of 3-4, ampulliform to lageniform phialides (3.5-7.0 × 2.6-3.4 μm), subglobose to globose conidia (2.2-2.6 × 2.0-2.4 μm). Differs from Trichoderma lentinulae by compact, relatively smaller phialides, and the character of pustules on SNA. Differs from Trichoderma lixii by shorter and wider phialides and smaller conidia.