Hypocreales » Cordycipitaceae » Akanthomyces

Akanthomyces kanyawimiae

Akanthomyces kanyawimiae Mongkols., Noisrip., Thanakitp., Spatafora & Luangsa-ard, Mycologia 110(1): 237 (2018)

Index Fungorum number: IF 823788; Facesoffungi number: FoF 13951

Parasitic on spiders. Sexual morph: Undetermined. Asexual morph: Colony entirely covering the host, white, powdery. Mycelium 1.2–3.8 (x̄ = 2.1, n = 60) μm in wide, septate, hyaline, smooth-walled. Conidiophores micronematous, septate, branched, bearing clusters of metulae or phialides. Metulae 4.5–8 × 2–3 (x̄ = 6.2 × 2.6, n = 20) μm cylindrical, hyaline, smooth-walled. Phialides 6–11 × 2–4 (x̄ = 8 × 3, n = 60) µm, monophialidic, ampulliform, typically swollen basal portion tapering into a long neck. Conidia 1.5–3.5 × 1.2–2.5 (x̄ = 2.7 × 1.9, n = 100) μm, globose to fusiform, unicellular, smooth-walled, hyaline, adhering in chains.

Culture characteristics – Colonies grow on PDA reaching 2 cm diameter after 5 days at 30 °C, white, velvety, nearly circular, umbonate; pale yellow from below.

Material examined – Thailand, Chiang Mai Province, Chiang Dao District, on spider lying on leaf litter, 9 February 2018, De-Ping Wei, CMCD01 (MFLU 22-0273), living culture MFLUCC 18-1389.

Molecular data – LSU (OQ127375), SSU (OQ127304), ITS (OQ127340), TEF (OQ186367), RPB1 (OQ186421), RPB2 (OQ186397).

Notes – Akanthomyces kanyawimiae was introduced by Mongkolsamrit et al. (2018) from a spider host in Thailand. Our collection was also found on a spider host lying on leaf litter in Thailand. It was identified as A. kanyawimiae based on its isaria-like asexual morph and the close phylogenetic affinity to the type strain (TBRC 7244).

 

 

Akanthomyces kanyawimiae (MFLU 22-0273). a host. b, c Upper and reverse view of cultures on PDA after 5 days incubation. d–f Conidiophore g, h Conidia produced from the apex of phialides. i–m Conidia. (i is germinating conidium). Scale bars: d = 50 µm, e, f, i = 10 µm, g, h = 5 µm, j–m = 2 µm.

Reference:

Wei DP, Gentekaki E, Wanasinghe DN, Karunarathna SC, Tang SM, Hyde KD 2022 – Diversity, molecular dating and ancestral characters state reconstruction of entomopathogenic fungi in Hypocreales. Mycosphere 13: 281–351.

 

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