Cunninghamella saisamornae N. Suwannarach & P. Wongputtisin, 2021

Suwannarach, Nakarin, Kumla, Jaturong, Supo, Chantana, Honda, Yoichi, Nakazawa, Takehito, Khanongnuch, Chartchai & Wongputtisin, Pairote, 2021, Cunninghamella saisamornae (Cunninghamellaceae, Mucorales), a new soil fungus from northern Thailand, Phytotaxa 509 (3), pp. 291-300 : 296

Cunninghamella saisamornae N. Suwannarach & P. Wongputtisin , sp. nov. Figure 2 .

MycoBank number: MB 839021

Diagnosis: —Distinguishable from other members of the Cunninghamella species by a lack of the zygosporic stage as well as by a chlamydospore formation and its maximum growth temperature at 45°C.

Etymology: —refers to the name of Emeritus Prof. Dr. Saisamorn Lumyong in honour of her 70th birthday and her over 30 years’ contribution to Thai mycology.

Holotype: — THAILAND, Chiang Mai Province, San Sai District , 19°15’42”N 101°0’16”E, isolated from soil in paddy field, March 2016, P. Wongputtisin & N. Suwannarach, dried culture: SDBR-CMU291 , ex-holotype TBRC 14914 .

Culture characteristics: —Colonies growing on CZA, PDA and SMA were 7.00–7.15, 6.90–7.10 and 6.80–7.00 mm in diameter after two days at 25°C. Colonies on CZA, PDA and MEA floccose, initially white and became yellowish white to pale yellow, reverse pale yellow after two weeks of incubation at 25°C ( Fig. 2 A−C). On all media the hyphae are branched, hyaline, smooth-walled, non-septate when young, irregularly septate when aging, 5–20 μm wide. Sporophores hyaline, erect to recumbent, smooth-walled, opposite or verticillate branches, main axes of the branches predominantly terminated with a vesicle. Vesicles subglobose to pyriform; terminal vesicles, smooth-walled, 25–50 μm in diameter (average 37.5 μm in diameter, n = 50); lateral vesicles smaller, smooth-walled, 20–37 μm in diameter (average 28.5 μm in diameter, n = 50) ( Fig. 2D ). Pedicels 4−10 μm long. Sporangioles borne on pedicles on vesicles, globose to subglobose, 13–18 μm in diameter (n = 50), hyaline, thick-walled, echinulate with short spines; spines 2–3 μm long ( Fig. 2E–G ). Zygosporangia not observed. Chlamydospores, subglobose, spherical to ellipsoid, 10–25 × 8–20 μm (n = 50) ( Fig. 2H–J ).

Additional specimens examined: — THAILAND, Chiang Mai Province, San Sai District , 19°15’42”N 101°0’16”E, isolated from soil in paddy field, March 2016, isolated by P. Wongputtisin & C. Supo: SDBR-CMUPFCM-9 .

Known distribution: — Chiang Mai Province, Thailand.

Figures

FIGURE 2. Cunninghamella saisamornae (SDBR-CMU291, holotype). A–C. Colonies on three different agar media A. Czapek Dox agar. B. Potato dextrose agar. C. Modified synthetic Mucor agar. D. Vesicles. E−G. Sporangioles. H−J. Chlamydospores. Scale bars:A−C = 10 mm; D, F, G = 25 μm and E, H, I, J = 10 μm.