Cordyceps succavus
Cordyceps succavus Y.P. Xiao, T.C. Wen & K.D. Hyde, in Hyde et al., Fungal Diversity: 10.1007/s13225-019-00429-2, [151] (2019)
Index Fungorum number: IF555420 Facesoffungi number: FoF05065
Sexual morph: Stromata 4–5 cm long, 3–6 mm wide, yellowish to yellow, fleshly, mostly solitary, stipitate, inside hollow after mature. Stipe 2–3 cm long, 3–5 mm wide, fleshly, yellowish to white, clavate, with stromata on the top. Fertile head 1.5–2 cm long, 4–5 mm wide, fleshly, solitary, cylindrical, yellow to yellowish. Stroma 3–3.4 × 2.4–2.7 mm (x̄ = 3.2 × 2.6 mm, n = 30) in vertical section, yellow to yellowish. Perithecia 534–655 × 179–278 μm (x̄ = 594 × 229 μm, n = 30), half-embedded, ampulliform to ovoid, yellow to yellowish, thick-walled, with ostiole on the top. Peridium 23–36 μm wide (x̄ = 29 μm, n = 60), two layers, textura porrecta in first layer, textura angularis in secondary layer. Asci 486–600 × 3.6–4.9 μm (x̄ = 543 × 4.3 μm, n = 60), 8-spored, hyaline, narrow cylindrical, with a thick apex. Apical cap 3.1–4.1 × 3.3–4.5 μm (x̄ = 3.6 × 3.9 μm, n = 60), hyaline. Ascospores 466–594 × 0.9–1.2 μm (x̄ = 530 × 1.1 μm, n = 60), filiform, smooth, hyaline, septate, breaking into secondary spores. Secondary spores 2.8–4.9 × 0.9–1.2 μm (x̄ = 3.8 × 1.1 μm, n = 60), cylindrical, smooth, hyaline, one-celled. Asexual morph: Undetermined.
Host and Habitat: Parasitic on an unknown insect buried (Lepidopteran) in the upper 1 cm of soil.
Known distribution: Thailand.
Material examined: THAILAND, Chiang Mai Province, Samoeng, on larvae (Lepidopteran), 10 July 2017, Y.P. Xiao, CM0752 (MFLU 18-1890, holotype); ibid., CM0752b, HKAS 96376 (MFLU 18-1891, isotype).
GenBank Accession No: ITS: MK086060, LSU: MK086062, RPB1: MK084616, RPB2: MK079353, SSU: MK086058.
Figure X. Cordyceps succavus (MFLU 18-1890, holotype). a Habitat of Cordyceps succavus. b Stromata without infected insect. c Vertical section of stroma. d Vertical sections showing the semi-immersed perithecia. e Perithecium wall. f, g Asci. h Part of ascospores. i Apical cap of asci. j, k Secondary ascospores. Scale bars: c, d = 500 μm, f, g = 200 μm, h = 50 μm, e = 20 μm, i–k = 5 μm.
Notes: According to morphology and phylogenetic analysis (Hyde et al. 2019), the new collection is closely related to Cordyceps grylli, which was collected from adults of Gryllidae in China (Teng 1936; Mains 1959), but the phylogenetic analyses support two different species. Cordyceps succavus is characterized by yellow to yellowish, longer stromata, not becoming grayish when dry, yellow ampulliform to ovoid perithecia, longer asci and shorter ascospores. Cordyceps grylli has yellow stromata, becoming grayish when dry, with half-embeded, light brown or chestnut brown, ovoid perithecia, cylindrical asci and filiform ascospores breaking into 1-celled secondary spores (Mains 1959). Therefore, Cordyceps succavus is introduced as a new species.
Table 1 Synopsis of Cordyceps species discussed in Hyde et al. (2019).
|
Species |
Host |
Stromata |
Fertile head (mm) |
Stipe (mm) |
Perithecia (μm) |
Asci (μm) |
Ascospores (μm) |
Secondary spores (μm) |
Reference |
|
|
|
C. grylli |
Gryllidae (Orthoptera) |
Yellow when fresh becoming grayish |
|
1-2 thick |
Ovoid, partly embedded (up to one-half), light brown or chestnut-brown 400–700 × 300–350 |
Cylindric, 300–400 × 4 |
Filiform, break into fragments |
1-celled, 4–5 × 1 |
Zang and Kinjo 1998 |
||
|
C. succavus |
Unknown insect |
Yellowish to yellow 4–5 cm long, 3–6 mm wide |
15–20 long, 4–5 wide, fleshly, solitary, cylindrical, yellow to yellowish |
20–30 long, 3–5 wide |
Half-embedded, ampulliform to ovoid, yellow to yellowish 534–655 × 179–278 |
Cylindrical 486–600 × 3.6–4.9 |
Filiform, multi-septate, 466–594 × 0.9–1.2 |
1-celled, 2.8–4.9 × 0.9–1.2 |
Hyde et al. 2019 |
|
|
Reference:
1. Hyde KD, Tennakoon DS, Jeewon R, Bhat DJ et al. (2019) Fungal diversity notes 1036–1150: taxonomic and phylogenetic contributions on genera and species of fungal taxa. Fungal Divers 96: 1–242.
2. Mains EB (1959) Cordyceps species. B Torrey Bot Club 86: 46–58
3. Teng SC (1936) Additional fungi from China IV. Sinensia 7:752–823.
4. Zang M, Kinjo N (1998) Notes on the alpine Cordyceps of China and nearby nations. Mycotaxon 66: 215–230
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