Glomerellales » Glomerellaceae » Colletotrichum

Colletotrichum siamense

Colletotrichum siamense Prihastuti, L. Cai & K.D. Hyde, Fungal Diversity 39: 98 (2009)

Index Fungorum number: IF515410         Facesoffungi number: FoF 03599          


Sexual morph: Undetermined. Asexual morph: Conidiomata 70–143 μm diameter, brown to dark brown, acervulate, oval, solitary to aggregated. Setae absent. Conidiophores hyaline, cylindrical or clavate, smooth walled, simple, to 80 μm long. Conidiogenous cells 10–14 μm long, enteroblastic, phialidic, hyaline, smooth walled, cylindrical to slightly inflated, Collarette 0.5–1 μm long, periclinal thickening visible. Conidia 7–19 × 3–4 μm (x̄ = 11 × 4 μm, n = 40) hyaline, smooth or verruculose, aseptate, guttulate, fusiform, ovoid to cylindrical or clavate with rounded apices. Appressoria not observed.

Culture characteristics: Colonies on PDA reaching a maximum of 80 mm diameter in 7 days at 25 ºC, at first white and becoming pale brownish to pinkish, reverse pale yellowish to pinkish, aerial mycelium greyish white, dense, cottony. Vegetative hyphae 2.1 μm hyaline, smooth walled, septate, branched.

Known distribution: Australia, Brazil, China, Japan, Korea, Nigeria, Puerto Rico, South Africa, Thailand, USA, Vietnam (Yang et al. 2009, Weir et al. 2012, Jayawardena et al. 2016, Shivas et al. 2016.

Material examined: Thailand, Chiang Rai, on dead leaves of Rosa sp. (Rosaceae), 19 May 2018, Ruvishika S. Jayawardena RV1 (MFLU 18–1839, new host record), living culture MFLUCC 18–1162.

GenBank Accession No: ITS: MN788676, GAPDH: MN995328, CHS: MN995336, ACT: MN995334, TUB: MN995329


Notes: Colletotrichum siamense has a wide host range and a distribution (Jayawardena et al. 2016). A strain in this study clustered with the type species of C. siamense. This is the first record of C. siamense as a saprotroph of Rosa sp. in Thailand.


Figure X. Colletotrichum siamense (MFLU 18–1839, new host record). a Conidiomata on host. b Conidiophores and conidiogenous cells. c–d Conidia. e Upper view of 7 day old culture. f Reverse view of 7 day old culture. Scale bars: b–d = 10µm.


Reference: Hyde KD, de Silva NI, Jeewon R, Bhat DJ, Liu NG, Chaiwan N, Bulgakov TS (2020) AJOM new records and collections of fungi: 1–100. Asian Journal of Mycology, 3, 22-294.


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Thailand Science Research and Innovation (TSRI),

project entitled:

"The future of specialist fungi in a changing climate: baseline data for generalist and specialist fungi associated with ants Rhododendron species and Dracaena species"

(Grant No. DBG6080013)

"Impact of climate change on fungal diversity and biogeography in the Greater Mekong Sub-region"

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  • Chinese Academy of Sciences,
  • Honghe County 654400, Yunnan, China

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