Acremonium curvum Xin Li, Y.F. Han & Z.Q. Liang, 2022

Li, Xin, Zhang, Zhi-Yuan, Ren, Yu-Lian, Chen, Wan-Hao, Liang, Jian-Dong, Pan, Ji-Mei, Huang, Jian-Zhong, Liang, Zong-Qi & Han, Yan-Feng, 2022, Morphological characteristics and phylogenetic evidence reveal two new species of Acremonium (Hypocreales, Sordariomycetes), MycoKeys 91, pp. 85-96 : 85

Acremonium curvum Xin Li, Y.F. Han & Z.Q. Liang sp. nov.

Fig. 3

Type.

Zhengzhou Zoo , Zhengzhou City, Henan Province, China N34°47'20", E113°40'41", isolated from green belt soil, July 2021, Yu-Lian Ren (dried holotype culture HMAS 351938, ex-holotype culture CGMCC 3.20954 = GZUIFR 22.035). ITS sequences, GenBank ON041034 , LSU sequences, GenBank ON041050 ; SSU sequences, GenBank ON876754 ; TEF 1-α sequences, GenBank ON494579 ; RPB2 sequences, GenBank ON494583 .

Description.

Colonies on PDA and OA at 25 °C attaining 11-14 mm and 7-9 mm diam respectively after 7 d, white, flat, radially folded or rugose. On MEA at 25 °C, reaching 6-8 mm after 7 d, white to yellowish-white, slimy. Hyphae hyaline, septate, sometimes winding, 1.5-2.5 µm wide. Sporulation abundant. Phialides are mostly borne singly, curved, slightly inflated at the base, tapered at the tip, up to 38.0 µm long. tapering from 1.5-3.5 µm near the base to 0.5-1.5 µm. Conidia cohering together on the top of phialides, one-celled, solitary, or several fascicled, ovoid or subglobose, 3.0-7.0 × 2.5-3.5 µm (x- ± SD = 4.1 ± 1.18 × 3.2 ± 0.77, n = 50) diam. Chlamydospores and teleomorph stage were not observed.

Etymology.

curvum. Referring to the curved Phialides.

Known distribution.

Henan Province, China.

Notes.

Based on the multi-locus analysis we found that Acremonium curvum had close phylogenetic affinities to other taxa of the Chrysogenum -clade. Morphologically, A. curvum was similar to other taxa of the Chrysogenum -clade in having simple or rarely branched conidiophores, slightly inflated at the base and tapered at tip phialides, and ovoid to subglobose conidia ( Yang et al. 2019). Conidia of Hapsidospora irregularis and A. curvum had several fascicled at the tips of the conidiophores ( Malloch and Cain 1970). However, A. curvum was differentiated by having mostly curved phialides and the conidia were several fascicled at the tips of the phialides.

Figures

Figure 3. Morphology of Acremonium curvum sp. nov. a-f colony on PDA, OA and MEA after 7 d at 25 ° C (upper surface and lower surface) g, I, j conidia are borne on the phialides h Winding hyphae. Scale bars: 4 mm (a-f); 10 μm (g-j).