Hypocreales » Nectriaceae » Pseudoachroiostachys

Pseudoachroiostachys krabiense

Pseudoachroiostachys krabiense Tibpromma & K.D. Hyde [as 'krabiense'], in Tibpromma et al., Fungal Diversity: 10.1007/s13225-018-0408-6, [108] (2018)

Index Fungorum number: IF554548         Facesoffungi number: FoF04555


Sexual morph: Undetermined. Asexual morph: Conidiophores 4050 × 3.54.5 μm (x̄ = 46 × 4 μm, n = 20), macronematous, mononematous, single, unbranched, erect, straight, 13-septate, slightly thick-walled towards the base, smooth, hyaline and glassy, bearing a whorl of 56 conidiogenous cells. Conidiogenous cells 68 × 12.5 μm (x̄ = 7 × 2 μm, n = 20), terminal, phialidic, discrete, cylindrical, hyaline, smooth, 1013 × 3.54.5 μm, narrowing to a short neck about 1 μm. Conidia 59 × 34 μm (x̄ = 7 × 3.5 μm, n = 40), ovoid, in a group, aseptate, sometimes flattened on one side, smooth, hyaline, with rounded apex, slimy in mass, without mucilaginous sheath.


Culture characteristics: Conidia germinating on MEA within 12 h. Colonies on MEA, circular with whorls, undulate, white, smooth and raised on surface media, velvety.


Habitat: Known to inhabit saprobic on dead leaves of Pandanus sp.


Known distribution: Thailand.


Material examined: Thailand, Krabi Province, Mueang Krabi District, on Pandanus sp., 15 December 2015, S. Tibpromma KB037 (MFLU 16-1915, holotype; HKAS 96264, isotype); ex-type living culture, MFLUCC 16-0325.


GenBank Accession No: LSU: MH376736; ITS: MH388362; SSU: MH388328; TEF1: MH388397.


Notes: Achroiostachys aurantispora L. Lombard & Crous has similar morphology with Pseudoachroiostachys krabiense in having similar colonies on host plant and conidiophores. Achroiostachys aurantispora has elongate ampulliform to ventricose or clavate conidiogenous cells and ellipsoidal conidia (Lombard et al. 2016) while Pseudoachroiostachys krabiense has cylindrical conidiogenous cells and ovoid conidia.

Figure X. Pseudoachroiostachys krabiense (MFLU 16-1915, holotype). a Colonies on dead leaf of Pandanus sp. b Conidiophores, conidiogenous cells and conidia. c Conidiogenous cells and conidia. df Conidia. g Germinating conidium. h, i Colonies on MEA from above and below. Scale bars: a = 50 μm, b, c, g = 5 μm, df = 2 μm.


Reference: Tibpromma S, Hyde KD, McKenzie EHC, Bhat DJ, Phillips AJL, Wanasinghe DN, Samarakoon MC, Jayawardena RS, Dissanayake AJ, Tennakoon DS, Doilom M, Phookamsak R, Tang AMC, Xu JC, Mortimer PE, Promputtha I, Maharachchikumbura SSN, Khan S, Karunarathna SC (2018) Fungal diversity notes 840928: micro-fungi associated with Pandanaceae. Fungal Diversity. 93:1-160.


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Supported by 

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"

(Grant No. RDG6130001)


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    1 Center of Excellence in Fungal Research
  • Mae Fah Luang University Chiang Rai
    57100 Thailand
  • 2 Kunming Institute of Botany
  • Chinese Academy of Sciences,
  • Honghe County 654400, Yunnan, China

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