Absidia aguabelensis J.D. Leitão, T.R.L. Cordeiro, H.B. Lee & A.L. Santiago, 2021

Leitão, Joana D. A., Cordeiro, Thalline R. L., Nguyen, Thuong T. T., Lee, Hyang B., Gurgel, Luciana M. S. & Santiago, André L. C. M. De A., 2021, Absidia aguabelensis sp. nov.: A new mucoralean fungi isolated from a semiarid region in Brazil, Phytotaxa 516 (1), pp. 83-91 : 86

Absidia aguabelensis J.D. Leitão, T.R.L. Cordeiro, H.B. Lee & A.L. Santiago sp. nov. ( FIGURE 2 )

Index Fungorum number: IF558263

Etymology: aguabelensis . Reference to the city (Águas Belas) from where the species was first isolated.

Holotypus: URM 94472

Colonies initially white, turning brownish grey, colonizing the entire Petri dish after 5 days of incubation at 25 °C in MEA; reverse light orange. Rhizoids short or long, branched or unbranched. Stolons light brown with irregularly spaced septa, 5–7.5 μm in diam. Sporangiophores hyaline or light gray, erect, long or short, arising from stolons, isolated or up to 8 in a whorl, single or branched, rarely re-branching (up to 3 times), up to 440 μm long and 2.5–7.5 μm wide; wall smooth or slightly incrusted. A septum below the sporangium is observed. Sporangia brown, apophysate, subglobose, piriform, with smooth and deliquescent wall, 13–26.5 × 9.5–30 μm in diam. Columellae hyaline to light brown, fig-shaped, 5–15.5 × 5–17 μm, and hemispherical, 2.5–15.5 × 7–17 μm, smooth-walled. Apophyses light brown, trapezoid and bell-shaped, up to 17 μm wide at the largest portion. Projections conical, up to 4.5 μm in length, or needle-shaped with or without a bulbous tip, up to 7.2 μm in length, some are almost inconspicuous. Rarely, two projections may be observed in a same columella. Collar evident. Sporangiospores hyaline, globose, 2.5–5 μm diam., subglobose, 4.5–6 × 3.6–5 μm, and cylindrical, 3.5–9.5 × 2–6 μm. Chlamydospores observed frequently. Zygospores not observed.

Culture characteristics: In MEA, at 10 °C–lack of growth, at 15 °C– slow growth (4.7 cm diam. after 168 h), at 20 °C–good growth (9 cm diam. after 144 h), at 25 and 30 °C–excellent growth (9 cm diam. after 120 h), at 35 °C–slow growth (9 cm diam. after 264 h), colonies are of a darker color, and at 40 °C–no growth. Absidia aguabelensis exhibited a similar growth and development of reproductive structures both on MEA and PDA at all examined temperatures.

Habitat: Soil

Distribution: Pernambuco, Brazil.

Specimen examined: BRAZIL, Pernambuco, Águas Belas, Serra do Comunaty (09°06.061’S 37°03.148’W), soil., at 300m a.s.l., 2018, J.D.A. Leitão (holotype URM 94472, ex-type URM 8213 ) .

Figures

FIGURE 2. Absidia aguabelensis sp. nov. (URM 8213). A. Surface of colony on malt extract agar at 25°C. B. Young sporangiophore with sporangium. C. Mature sporangiophores with sporangium, columella, and a bell-shaped apophysis. D, E. Branched sporangiophore; F, G, H, I. Sporangiophore with columella; J. Sporangiospores. Bars: B, C, J = 25 μm; D, E = 50 μm; F, G, H, I = 12.5 μm.