Fusiconidium mackenziei J.F. Li, Phookamsak, Camporesi & 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 : 211

Fusiconidium mackenziei J.F. Li, Phookamsak, Camporesi & K.D. Hyde , sp. nov. Fig. 1

MycoBank number: MB 817937; Facesoffungi number: FoF 02484

Etymology:—Named in honour of the mycologist Dr. E.H.C. McKenzie, in recognition of his contribution to the study of hyphomycetes.

Holotype: MFLU 16–2139

Saprobic on branch of Clematis vitalba ( Ranunculaceae ). Sexual morph: Undetermined. Asexual morph: Hyphomycetes. Colonies on the natural substratum effuse, hairy, black. Mycelium immersed, composed of septate, branched, smooth hyphae. Conidiophores 91–114 μm long × 8.5–11 μm wide (x = 111 μm × 9.8 μm, n = 30), macronematous, mononematous, dark brown, septate, unbranched, thick-walled, smooth, erect, paler towards the apex, cylindrical, with 7–9 transverse eusepta. Conidiogenous cells enteroblastic, percurrently proliferating, cylindrical, pale brown to dark brown, thin-walled, smooth. Conidia 38–40 μm long × 12–15 μm wide (x = 40 μm × 14 μm, n = 30), acrogenous, straight or curved, fusiform to ellipsoidal, with 7 transverse eusepta, constricted at the septa, pale brown to dark brown, light colored and obtuse at the apex, echinulate, with broadly truncate at the base. Conidial secession rhexolytic.

Cultural characteristics: —Conidia germinating on PDA within 14 hours at 16 ºC, with germ tubes produced from both ends. Colonies reaching 75 mm diam. after 6 weeks at 25 ºC, medium dense, circular with mycelium semi-immersed to superficial, regular, flat, slightly raised, with undulate edge, slightly rough on surface, cottony, grayish brown, cream at the margin; reverse, orange-brown to reddish brown.

Material examined: — ITALY, Forlì-Cesena Province, Passo la Calla—Santa Sofia, on dead branch of Clematis vitalba ( Ranunculaceae ), 25January 2014, E. Camporesi, IT1669 ( MFLU 16-2139, holotype!), ex-type living culture, MFLUCC 14-0434, KUMCC 16-0031 (isotype in HKAS, as HKAS 95019).

Notes: — Fusiconidium mackenziei is described based on a collection on dead branch of Clematis vitalba from Italy and represents the type species of genus Fusiconidium . Fusiconidium mackenziei is characterized by thick-walled, fusiform 7-euseptate, echinulate conidia, enteroblastic conidiogenous cells with percurrent extensions, subhyaline at the apex and rhexolytic conidial secession. In the phylogenetic analysis based on combined LSU, SSU, TEF 1-α and RPB2 gene, F.mackenziei and F. aquaticum . formed an independent and distinct lineage within the Melanommataceae .

Figures

FIGURE 1. Fusiconidium mackenziei (MFLU 16–2139, holotype). a–b. Colonies on dead branch of Clematis vitalba. c, g, n–o. Conidiophores bearing conidia. d–f. Conidiophores. h–m. Conidia. p. Germinating conidia. Scale bars: a = 200 μm, b = 50 μm, c–g = 20 μm, n–p = 10 μm, h–m = 5 μm.