Acremonium camptosporum W. Gams 1971

Sun, Jing-Zu, Ge, Qin-Ya, Zhu, Zhi-Bao, Zhang, Xiao-Ling & Liu, Xing-Zhong, 2019, Three dominating hypocrealean fungi of the ‘ white mold spots’ on acrylic varnish coatings of the murals in a Koguryo tomb in China, Phytotaxa 397 (3), pp. 225-236 : 230-231

Acremonium camptosporum W. Gams 1971 ( Fig. 3 )

Saprobic on substrate. Asexual morph: Colonies on PDA flat to slightly elevated in center, funiculose, pale yellow both forward and reverse, without pigment diffusing into the agar. Conidiophores macronematous, mononematous, mainly long solitary phialides, often basitonously branched. Phialides straight or slightly flexuous, 15–46 × 0.5–1

μm (x = 38 × 0.8 μm, n = 30), tapering at the apex. Conidia solitary, acrogenous, amerospores, fusiform, or ovoid, sometimes slightly curved and basally apiculate, aggregated in small slimy globose clusters, aseptate, hyaline, guttulate, smooth and thin-walled, heteropolar-bilatral, 2.5–3.0 × 1.2–2 μm (x = 2.8 × 1.5 μm, n = 50). Chlamydospores absent. Octahedral crystals undetermined.

Culture characteristics: Colonies on PDA slow-growing, reaching 20–25 mm in diameter in 10 days at 20 °C.

Material examined: CHINA. Jilin Province, JiAn City, WKT5 tomb, associated with‘white moldy spots’ on B01-6 coat, 30 August 2016. J.Z. Sun, living culture CGMCC 3.19017.

Notes: Acremonium camptosporum was described as a new species by producing orthotropic phialides, and small curved arranged in the slimy heads. (Gams 1971). Our isolate produces Acremonium -like conidiophores and conidia which resemble A. camptosporum ( Fig. 3 ). Phylogenetically, it grouped A. camptosporum , together with the type stain with strong support (100 MLBS & 1.00 BYPP, Fig. 2 ). Although the conidia of our isolate (2.5–3.0 × 1.2–2 μm) are smaller than the type strain mentioned in Gams’s description (2.8–3.8 × 1.1–1.8 μm), based on our phenotypic and phylogenetic analyses, our isolate also represents A. camptosporum .

Figures

FIGURE 2. Phylogeny of Hypocreales based on a combination of ITS and LSU sequence data. Xylaria hypoxylon, Xylaria arbuscula, and Xylaria polymorpha are selected as outgroup taxa. Bayesian posterior probabilities greater than 0.95 are indicated (BYPP) (left). Bootstrap values higher than 75% from RAxML (MLBS) (right) are given above the nodes. Asterisks indicate bootstrap values less than 50% or Bayesian posterior probability values lower than 0.95. T indicates ex-living type. NT indicates new ex-living type. Our taxa are in red font.

FIGURE 3. Acremonium camptosporum (CGMCC 3.19017) a Colonies on PDA after 14 days, forward (left), reverse (right). b–e Conidiophores with conidia. f–i Conidiogenous cells. j–m Conidia. Scale bars: b–h = 10 μm; i–m = 5 μm.