Capillidium adiaeretum (Drechsler) B. Huang & Y. Nie, 2020

Nie, Yong, Yu, De-Shui, Wang, Cheng-Fang, Liu, Xiao-Yong & Huang, Bo, 2020, A taxonomic revision of the genus Conidiobolus (Ancylistaceae, Entomophthorales): four clades including three new genera, MycoKeys 66, pp. 55-81 : 55

Capillidium adiaeretum (Drechsler) B. Huang & Y. Nie comb. nov. Figure 3

Conidiobolus adiaeretus Drechsler, J. Wash. Acad. Sci. 43: 42 (1953). Basionym.

Specimens examined.

China, Jiangsu Province, Nanjing City, Laoshan Forest Park, 32°5'58"N, 118°35'53"E, Plant detritus, 1 Dec 2018, Y. Nie and Y. Gao, HMAS 248358, culture CGMCC 3.15888 (= RCEF 6550).

Description.

Colonies on PDA at 25 °C after 3 d, white, reaching ca. 7-10 mm in diameter. Mycelia colourless, 3-4.5 μm wide. Primary conidiophores, colourless, unbranched and producing a single globose conidium with widening upwards; they offer a pronounced dimensional contrast with the mycelial filaments, extending to a length of 50-210 μm into the air, 3-25 μm wide. Primary conidia forcibly discharged, colourless, globose, measuring 15-45 μm in greatest length and 13-42 μm in total width, including a basal papilla 2-6 μm high and 5-17 μm wide. After discharging on to 2% water-agar, similar and smaller secondary conidia arise from primary conidia, two generations of multiple spherical units forming on the parent globose conidia Microconidia only formed from the second set, 5-12 × 9-10 μm. Capilliconidia formed readily from discharged microconidia, 16-24 × 5-6 μm. Chlamydospores formed within the substratum, colourless, globose to ellipsoidal, 13-40 × 15-45 μm.

Notes.

The species was firstly reported from America ( Drechsler 1953a). The ex-type living culture is ATCC 12589 isolated by Drechsler (1953a). It is mainly characterised and differs from other Capillidium species by its ability to form both microconidia and capilliconidia ( Callaghan et al. 2000). The Chinese specimen CGMCC 3.15888 clusters completely (100/1.00) with an isotype ARSEF 451 (98% sequence similarity in nucLSU) and fits well with its morphological descriptions. It is reported in China for the first time.

Figures

Figure 3. Capillidium adiaeretum a colony on PDA after 3 d at 25 ° C b mycelia c, d primary conidiophores bearing primary conidia e, f primary conidia g Production of secondary conidia h first stage of forming microconidia i second stage of forming microconidia j, k ellipsoidal secondary conidia arising from slender conidiophores l chlamydospores. Scale bars: 10 mm (a); 100 μm (b); 20 μm (c-l).