Dothideomycetes » Dothideomycetes, genera incertae sedis » Dianesea

Dianesea palmae 

Dianesea palmae (F. Stevens) Inácio& P.F. Cannon, Fungal Diversity 9: 72 (2002)                              Figs 1, 2

= Cocconia palmae F. Stevens, Illinois Biol. Monogr. (Urbana) 11(no. 2): 175 (1927)

Index Fungorum number: IF374776; Facesoffungi number: FoF 06232

Saprobic on palm stems. Hemi-biotrophic as small leaf spots 1 mm long × 2 mm wide, dispersed, rarely confluent, amphigenous, flat, black, variable in shape, generally elliptical, but sometimes circular or irregular forming dark brown to black leaf spots. Sexual morph: Ascostromata 1.6–2.2 mm high × 1.0–1.2 mm diam., solitary, scattered, superficial to sometimes semi-immersed, conical, with single locule, ostiolate, coriaceous. Ostiole typically widely porate, broadly papillate. Stromatal wall dense, thick, composed of brown-walled cells 3–7 µm diam, globose around the edge and angular and slightly larger in the central part. Peridium 24–41 µm, comprising several layers of brown and thick-walled cells of textura angularis. Hamathecium composed of 1–2 µm diam., of relatively thin, dense, anastomosing, septate, branching interascal pseudoparaphyses. Asci 52–74 µm × 13–16 µm (x̅ = 57.2 × 14.8 µm, n = 10), 8-spored, bitunicate, clavate to subcylindrical, with a short, narrow pedicel, thickened and rounded at apex, with an ocular chamber. Ascospores 12–15 µm × 3–5 µm (x̅ = 13.8 × 4.3 µm, n = 10), uniseriate to partially overlapping, hyaline to pale olivaceous when immature, dark brown when mature, ellipsoidal or cylindrical to clavate, 1-septate, conspicuously constricted at the septum, smooth and thick-walled, surrounded by gelatinous layer, verrucose, cylindric, ellipsoidal, the lower cell slightly attenuated and rounded towards the base, the upper cell with a rounded apex. Asexual morph: Conidiomata 1.6–2.2 mm high × 1.0–1.2 mm diam., variable in shape, pycnothyrial, subglobose to globose or elliptical, solitary, scattered, immersed to semi-immersed. Conidiophores indistinct. Conidiogenous cells 3.3–5.5 µm × 2.6–2.7 µm (x̅ = 4.4 × 2.7 µm, n = 10) holoblastic, annellidic, discrete, cylindrical, and smooth-walled. Conidia 11–13 µm × 3–4 µm (x̅ = 12.7 × 3.5 µm, n = 10) hyaline to greenish, cylindrical, straight or slightly curved, obtuse at the apex, with small guttules.

Material examined – COSTA RICA, Peralta, on palm leaves, 13 July 1923, F.L. Stevens (NY 01089812, holotype).

Economic significance – None is reported.