Lamproconiaceae Norph., T.C. Wen & K.D. Hyde, in Norphanphoun et al., Phytotaxa 270(2): 94 (2016)

Index Fungorum number: IF 552187; 14 species.

Pathogenic and saprobic on dead herbaceous branches. Sexual morph: Stromata prosenchymatous around perithecia, delimited externally by greenish-blackened dense pseudoparenchymatous zone, interior whitish, composed of interwoven hyphae mixed with substrate cells, 3–5 ascomata in a stromata. Ascomata perithecial, small, aggregated, scattered, globose to subglobose, light brown to dark brown, coriaceous, ostiolate, papillate. Papilla converging and erumpent through stroma surface as single, large opening, wide at the top, narrowing towards the base, dark brown region around base of the papilla. Peridium comprises light brown, compressed, cells of textura angularis. Asci 8-spored, unitunicate, cylindrical, short pedicellate, with a J-, apical ring. Ascospores uniseriate, broadly ellipsoid, 1-septate, not or lightly constricted at the septa, hyaline, smooth-walled. Asexual morph: Conidiomata pycnidial, solitary, partly immersed in host tissue, uniloculate, multilocular or convoluted, dark blue (Lamproconium), dark blackish brown (Hercospora), erumpent in the centre. Pycnidium thick-walled, thin at inner layer, hyaline (Lamproconium), dark brown (Hercospora), comprising wall cells of texture angularis (Lamproconium) or textura intricate (Hercospora). Ostiole absent, dehiscence irregular. Paraphyses interspersed within conidiophores. Conidiophores filiform or cylindrical, pale-bluish or hyaline, septate, branched, smooth-walled, formed at the base of conidiomatal wall. Conidiogenous cells holoblastic, cylindrical to subcylindrical, each forming a single conidium at the conidiophore apex, or annellidic, colourless to olivaceous, smooth-walled. Conidia fusiform, ellipsoid, thick-walled, with granular, contents granular, aseptate, bluish to glistening dark blue (Lamproconium), hyaline (Hercospora), smooth-walled, produced in mucilage but without a distinct mucilaginous envelope or appendage (adapted from Norphanphoun et al. 2016).

Type genus – Lamproconium (Grove) Grove

Notes – Lamproconiaceae was established by Norphanphoun et al. (2016) to accommodate Lamproconium and Hercospora, based on morphology and phylogenetic analyses. Lamproconiaceae forms a robust clade basal to Sydowiellaceae and Stilbosporaceae in the combined ITS and LSU phylogeny and the conidia differ from those of Sydowiellaceae and Stilbosporaceae (Norphanphoun et al. 2016, Senanayake et al. 2017b).

Ecological and economic significance of Lamproconiaceae
Species in Lamproconiaceae are pathogens and saprobes on the branches and bark of various trees (Norphanphoun et al. 2016). Lamproconium desmazieresi causes canker on branches or twigs of lime trees (Tilia spp.).

Figure 1 – Phylogram generated from maximum likelihood analysis based on combined ITS and LSU sequence data. Ten strains are included in the combined analyses which comprised 1481 characters (888 characters for LSU, 588 characters for ITS) after alignment. Tree topology of the maximum likelihood analysis is similar to the Bayesian analysis. The best RaxML tree with a final likelihood value of -3757.205650 is presented. Estimated base frequencies were as follows: A = 0.241207, C = 0.254436, G = 0.292063, T = 0.212294; substitution rates AC = 1.348299, AG = 1.144904, AT = 1.519494, CG = 1.207099, CT = 4.339344, GT = 1.000000; gamma distribution shape parameter a = 5.434534. Bootstrap support values for ML greater than 75% and Bayesian posterior probabilities greater than 0.95 are given near nodes respectively. The tree is rooted with Melanconis alni (AR3748). The newly generated sequences are indicated in yellow.