Fusiconidium J.F. Li, Phookamsak & K.D. Hyde, 2017

Li, Junfu, Jeewon, Rajesh, Luo, Zonglong, Phookamsak, Rungtiwa, Bhat, Darbhe J., Mapook, Ausana, Phukhamsakda, Chayanard, Camporesi, Erio, Lumyong, Saisamorn & Hyde, Kevin D., 2017, Morphological characterization and DNA based taxonomy of Fusiconidium gen. nov. with two novel taxa within Melanommataceae (Pleosporales), Phytotaxa 308 (2), pp. 206-218 : 208-211

Fusiconidium J.F. Li, Phookamsak & K.D. Hyde , gen. nov.

MycoBank number: MB 817936; Facesoffungi number: FoF02516

Etymology:—Named after its fusiform conidia.

Saprobic on woody litter or herbs. Sexual morph: Undetermined. Asexual morph: Hyphomycetous. Colonies effuse, superficial, brown. Conidiophores macronematous, mononematous, erect, flexuous, septate, unbranched, brown to dark brown, single, smooth, thick-walled, cylindrical, percurrently proliferating. Conidiogenous cells enteroblastic, integrated, terminal, often light brown and subhyaline at apex, cylindrical or doliiform. Conidia acrogenous, solitary, dry, rostrate, straight or curved, fusiform to ellipsoidal, euseptate, pale brown to brown, smooth or verruculose, thick-walled. Conidial secession rhexolytic.

Type species:— Fusiconidium mackenziei J.F. Li, Phookamsak, Camporesi & K.D. Hyde , sp. nov.

Notes:— Fusiconidium forms a separate clade basal to Bertiella ( Melanommataceae ) in the phylogeny from the combined sequence data ( Fig. 3 ). Based on the sequence data and the distinct morphology, we treat Fusiconidium as a new genus in Melanommataceae ( Pleosporales , Dothideomycetes ). Morphologically, Fusiconidium resembles Sporidesmiella , Nigrolentilocus , Phragmocephala and Distophragmia in conidial shape. Sporidesmiella is transferred into Didymosphaeriaceae , Nigrolentilocus and Phragmocephala are positioned within the Melanommataceae ( Tian et al. 2015) , while Distophragmia has been referred to family incertae sedis ( Castañeda-Ruiz et al. 2015). In addition, Sporidesmiella and Distophragmia have distoseptate conidia with schizolytic conidial secession ( Kirk 1982, Castañeda-Ruiz et al. 2001). Phragmocephala has synnematous conidiophores and holoblastic conidiogenous cells without percurrent extensions ( Mason & Hughes 1951, Whitton et al. 2012, Su et al. 2015). Nigrolentilocus has polyblastic or holoblastic conidiogenous cells with schizolytic conidial secession ( Castañeda-Ruiz et al. 2001). Fusiconidium can be distinguished from these genera in having rhexolytic conidial secession, percurrently proliferating conidiophores, with enteroblastic conidiogenous cells and acrogenous, pale brown to dark brown, verruculose, fusiform, euseptate conidia. Therefore, we introduced a new genus Fusiconidium to accommodate two new taxa; Fusiconidium mackenziei and F. aquaticum in Melanommataceae .

Figures

FIGURE 3. Phylogenetic construction using RAxML based analysis of a combined LSU, SSU, TEF1-α and RPB2 dataset. Bootstrap support values for Maximum Likelihood (ML, black), equal or greater than 50% and Bayesian posterior probabilities (PP, red) equal to or greater than 0.90 are shown above the nodes. The tree is rooted to Roussoella nitidula (MFLUCC 11-0634, MFLUCC 11-0182). The type strains are in black bold and the newly generated sequences are indicated in red bold.