Curvularia vietnamensis Iturrieta-Gonzalez , Gene & Dania Garcia, 2020

Iturrieta-Gonzalez, Isabel, Gene, Josepa, Wiederhold, Nathan & Garcia, Dania, 2020, Three new Curvularia species from clinical and environmental sources, MycoKeys 68, pp. 1-21 : 1

Curvularia vietnamensis Iturrieta-Gonzalez, Gene & Dania Garcia sp. nov. Fig. 4

Etymology.

Name refers to the country where the species was collected.

Type.

Vietnam, north-east region, on an unidentified dead leaf, Aug 2011, J. Guarro (holotype CBS H-24295, culture ex-type CBS 146222, FMR 17659).

Description

(PDA at 25 °C). Mycelium composed of branched, septate, subhyaline to pale brown, thin and smooth-walled to verruculose hyphae, 2-4 μm wide. Conidiophores macronematous, mononematous, septate, straight or flexuous, sometimes slightly geniculate at upper part, unbranched to slightly branched, smooth to verruculose, pale brown to brown, 11-136(-194) × 3-6 μm (av. ( ± SD) 92.2 ( ± 72.86) × 4.21 ( ± 0.85)). Conidiogenous cells terminal or intercalary, mono- or polytretic, proliferating sympodially, pale brown, with darkened scars, subcylindrical to swollen, 3-7 μm wide. Conidia (1-)3(-4)-septate, curved, with the third cell from base unequally enlarged, some apically bifurcate, smooth-walled, apical and basal cells pale brown, middle cells brown, 15-28 × 5-12 μm (av. ( ± SD) 21.38 ( ± 3.44) × 9.34 ( ± 1.83)); hila slightly protuberant, thickened and darkened. Sexual morph not observed.

Culture characteristics

(7 d at 25 °C). Colonies on PDA reaching 62 mm diam., greenish-grey to dark green (28C2/29F8), final edge white, umbonate, densely floccose, margin regular; reverse grey (29F1), final edge pale grey (1B2). On PCA, reaching 58 mm diam., olive grey to grey (3F2/3B1), slightly floccose at the centre, margin regular, final edge whitish; reverse olive grey to grey (3F2/3B1). On OA, reaching 74 mm diam., olive (2F3) slightly floccose at the centre, margin regular, flat; reverse olive to greenish-grey (2F3/1C2). Sporulation abundant mainly on PCA and OA.

Cardinal temperature for growth.

Optimum 30 °C, maximum 37 °C, minimum 15 °C.

Distribution.

Indonesia and Vietnam.

Additional specimen examined.

Indonesia, from Sorghum seed, 1948, J. van der Vecht (CBS 188.48 = FMR 11956).

Notes.

See C. suttoniae described above.

Figures

Figure 4. Curvularia vietnamensis sp. nov. (ex-type FMR 17659). A-C Colonies on PDA, PCA and OA, respectively, at 25 ° C after 7 d D-H conidiophores and conidia. Scale bars: 10 μm.