Ctenomyces serratus Eidam, in Beitrag zur Kenntnis der Gymnoasceen, Beitraege zur Biologie der Pflanzen 3: 267-305 (1880)

Zhang, Zhi-Yuan, Han, Yan-Feng, Chen, Wan-Hao & Liang, Zong-Qi, 2019, Phylogeny and taxonomy of three new Ctenomyces (Arthrodermataceae, Onygenales) species from China, MycoKeys 47, pp. 1-16 : 1

Ctenomyces serratus Eidam, in Beitrag zur Kenntnis der Gymnoasceen, Beitraege zur Biologie der Pflanzen 3: 267-305 (1880) Figure 6

Description.

Aerial hyphae hyaline, smooth, septate, branched, 0.9-3.3 μm wide; racquet hyphae absent. Terminal and lateral conidia borne on hyphae, short protrusions, side branches or an ampulliform swelling; ampulliform swelling solitary or 2 in series. Conidia solitary or in series of up to 2-3 conidia connected by short and slim hypha, mostly ellipsoidal, sometimes subglobose; smooth- or rough-walled, verrucose, spinate, 11.5-21.9 × 8-15.2 μm (x‒ = 18.5 × 13.2 μm, n=15). Intercalary conidia absent.

Culture characteristics.

Colonies on PDA growing in the dark reaching 30 mm diam. in 14 d at 25 °C, brown, white in the margin, floccose at the centre, short fluffy in other part, appearing obvious annulation; rounded, margin regular and defined. Reverse yellowish.

Specimens examined.

CHINA, Guizhou Province, on soil, Sept. 2016, Z.Y. Zhang, dried cultures HMAS 255390, HMAS 255444 and HMAS 255445, isolates CGMCC 3.18622 (GZUIFR-S37.1), CGMCC 3.18623 (GZUIFR-S37.2) and CGMCC 3.18624 (GZUIFR-S37.3).

Known distribution.

Currently known from Australia, England, India, Argentina, Germany (sensu Oorschot 1980) and China (this study).

Notes.

The Australian collection of C. serratus (CBS 187.61) lacks racquet hyphae, conidia occur occasionally on short protrusions and usually 1-2 are borne on ampulliform swellings, solitary or in series of up to 3 conidia separated by short, narrow hyphal segments, initially subhyaline, thin- and smooth-walled, soon becoming reddish-brown, verrucose and thick-walled, ellipsoid, 5-23 × 3.5-12 µm, mature conidia usually 12-23 × 10.5-12 µm, with narrow basal scars (approx. 1 µm) (sensu Oorschot 1980). The characteristic features data from the China collections matched rather well with the original description of C. serratus reported from Australia. Phylogenetically, our isolates CGMCC 3.18622, CGMCC 3.18623 and CGMCC 3.18624 shared a close relationship with C. serratus (Figures 1, 2). Therefore, the isolates CGMCC 3.18622, CGMCC 3.18623 and CGMCC 3.18624 were identified as C. serratus which was new to China.