Pleosporales » Phaeosphaeriaceae » Alloneottiosporina

Alloneottiosporina thailandica

Alloneottiosporina thailandica W.J. Li & K.D. Hyde, Fungal Diversity 100, 327 (2020)

Index Fungorum number: IF557135, Facesoffungi number: FoF 07108

Etymology: Referring to Thailand, where the holotype was collected.

Parasitic on living leaves of grass, forming conspicuous, small, rounded, black conidiomata. Sexual morph: undetermined, Asexual morph: Conidiomata 100–140 µm diam., 80–140 µm high, pycnidial, separate, gregarious to confluent, globose to subglobose, semi-immersed, unilocular, glabrous, ostiolate, thick-walled. Conidiomatal wall 10–20 µm wide, composed dark brown to brown, thick-walled cells of textura angularis in the above half, becoming hyaline, thin-walled cells in the basal part. Ostiole single, inconspicuous, circular, centrally located. Conidiophores reduced to conidiogenous cells. Conidiogenous cells arising all around the wall of conidiomata, 36.5 × 37 µm, hyaline, enteroblastic, ampulliform or short cylindrical, determinate, smooth-walled. Conidia 1017 × 3.54.5 µm (mean = 15 × 4 µm; n = 30), hyaline, ellipsoid to ovoid, with a broad and rounded apex, and a narrow and truncate base, 1-septate, slightly constricted at the septum, smooth and thick-walled, guttulate, bearing mucoid appendage at both ends; apical appendage tentaculiform, undulate or widely flared, arising from the partial mucoid sheath which initially enclosed the upper part of young conidium; basal appendage small, inconspicuous, slightly flared .

Culture characters: Colonies on PDA, reaching 5 mm diam. after 5 weeks at 2025°C, circular to irregular, with sparse, white aerial mycelium, surface olivaceous-black, reverse similar in colour.

Material examined: Thailand, Chiang Rai, on living leaves of grass, 19 March 2015, Jing-Zu Sun, WJL0030 (MFLU 19-2896, holotype), ex-type living culture MFLUCC 15-0576.

Notes: Alloneottiosporina thailandica shares a similar conidia form with the generic type, A. carolinensis, but can be distinguished by the number of septa. Alloneottiosporina thailandica has a single septum, while A. carolinensis has 2–3 septa. Moreover, A. thailandica has smaller conidia than A. carolinensis [2030(32) × 6.58.5 µm (mean = 25 × 7.5 µm)] and A. infundibularis [1534 × (8)910 µm (mean = 24.5 × 9.5 µm)].