Pseudodactylariales » Pseudodactylariaceae » Pseudodactylaria

Pseudodactylaria camporesiana

Pseudodactylaria camporesiana W. Dong, Doilom & K.D. Hyde, in Hyde et al., Fungal Diversity 100: 217 (2020)

Index Fungorum number: IF556924         Facesofungi number: FoF 06344

Etymology: Named in honour of Mr. Erio Camporesi for his contributions to fungi.

Holotype: MFLU 18-153


Saprobic on decaying, submerged wood in freshwater. Sexual morph: Undetermined. Asexual morph: Colonies on natural substrate, superfcial, efuse, gregarious, white. Mycelium partly immersed in natural substratum, composed of hyaline, branched, septate hyphae. Conidiophores 35–45 × 3.5–5 µm ( x̄ = 40 × 4.2 µm, n = 5), macronematous, mononematous, unbranched, subcylindrical, robust at base, straight to fexuous, rough, brown at the base, hyaline at upper part, septate, constricted at septa, thin-walled. Conidiogenous cells 20–30 × 4–4.6 µm ( x̄ =26 × 4.2 µm, n=5), holoblastic, polyblastic, integrated, terminal, sympodial, subcylindrical with apical taper, straight or fexuous, apical part forming a rachis with numerous, aggregated, cylindrical denticles, hyaline, rough-walled. Conidia 18–22 × 3.5–4.5 µm ( x̄ = 20 × 3.8 µm, n = 20), solitary, aggregating in slimy mass, pleuroacrogenous, narrowly fusiform, hyaline, smooth, guttulate, 1-septate, slightly constricted at the septa, lacking a sheath.


Culture characteristics: On PDA, colony circular, reaching 15 mm in 10 days at 25 °C, white from above, pale yellow from below, surface smooth with sparse mycelium, dry, edge entire, mycelium mostly immersed in culture.


Material examined: THAILAND, Satun Province, on submerged wood in a stream, 10 May 2018, W. Dong, hat290 (MFLU 18-1535, holotype), ex-type living culture MFLUCC 18-1410; ibid., hat290-2 (HKAS 105053, isotype), ex-isotype living culture KUMCC 19-0074.

GenBank numbers: ITS=MN796325, LSU=MN796326, SSU=MN796327.


Notes: A megablast search using the LSU sequence data of Pseudodactylaria camporesiana (MFLUCC 18-1410) revealed closest affinities with members of Pseudodactylaria, i.e. Pseudodactylaria brevis (identities=810/829 (98%), gaps = 2/829 (0%)), P. xanthorrhoeae (identities=805/835 (96%), gaps=2/835 (0%)) and P. hyalotunicata (identities=805/837 (96%), gaps=2/837 (0%)). In our phylogenetic analyses based on LSU and ITS genes (Fig. 139), P. camporesiana formed a well-supported clade with other Pseudodactylaria species in Pseudodactylariales(Sordariomycetes). The morphologically similar genus Dactylaria was shown to be polyphyletic and phylogenetically distant from Pseudodactylariales (Réblová 2009). Pseudodactylaria xanthorrhoeae and P. hyalotunicata have somewhat longer or thinner conidia in comparison with P. camporesiana (Tsui et al. 1997; Crous et al. 2017), and both species have a hyaline gelatinous sheath surrounding the conidia, a feature that is lacking in P. camporesiana. Pseudodactylaria brevis is similar to P. camporesiana in having hyaline, 1-septate conidia without a sheath. However, they can be distinguished by conidial size (11.5–17.5×2.5–4 μm in P. brevis versus 18–22×3.5–4.5 µm in P. camporesiana) (Lin et al. 2018). The other three accepted species in the genus possess hyaline conidiophores, while they are brown at the base in P. camporesiana (Tsui et al. 1997; Crous et al. 2017; Lin et al. 2018). Thus, P. camporesiana sp. nov. is introduced here.


Figure X. Pseudodactylaria camporesiana (MFLU 18-1535, holotype). a Colonies on submerged wood. b Conidiophore, conidiogenous cell and attached conidia. c–e Upper part of conidiophores and conidiogenous cells. f–i Conidia. j Colony on PDA (from front). K Colony on PDA (from reverse). Scale bars: b–e=20 μm, f–i=5 μm


Reference: Hyde KD, Dong Y, Phookamsak R, Jeewon R, Bhat DJ, Jones EB, Liu NG, Abeywickrama PD, Mapook A, Wei D, Perera RH. Fungal diversity notes 1151–1276: taxonomic and phylogenetic contributions on genera and species of fungal taxa.


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