Pleosporales » Phaeosphaeriaceae

Alloneottiosporina

Alloneottiosporina Nag Raj, Coelomycetous Anamorphs with Appendage-bearing Conidia: 121 (1993)

Facesoffungi number: FoF 07107

Dothideomycetes, Pleosporomycetidae, Pleosporales, Phaeosphaeriaceae

Parasitic on living leaves of undetermined species of bamboo, grass, and Paspalum distichum. Sexual morph: undetermined. Asexual morph: Conidiomata brown to dark brown or black, pycnidial, separate, gregarious or confluent, immersed to semi-immersed, globose to subglobose, unilocular, glabrous, thick-walled, papillate, ostiolate. Ostiole circular to oval, papillate, centrally located. Conidiomatal wall composed of thick-walled, dark brown to pale brown or hyaline cells of textura prismatica or textura angularis. Conidiophores reduced to conidiogenous cells. Conidiogenous cells of two kinds: a) those producing macroconidia lining the base and side walls of conidiomata, hyaline, annellidic, ampulliform to lageniform, smooth-walled; b) those producing microconidia restricted to the roof of the conidiomata near the ostiolar channel, hyaline, ampulliform, conical, lageniform or irregular, discrete, without annellations, smooth-walled. Macroconidia hyaline, ellipsoid, clavate, subcylindrical or fusiform, euseptate, constricted at the septa, smooth-walled, bearing mucoid appendages at both ends, apical appendgaes initially funnel-shaped or widely flared, eventually splitting to become tentaculiform; basal appendage less conspicuous than the apical appendages. Microconidia hyaline, ellipsoid or subglobose to obovate, acute or rounded at the apex, narrow and truncate at the base, smooth-walled.

Type species: Alloneottiosporina carolinensis Nag Raj, Coelomycetous Anamorphs with Appendage-bearing Conidia: 122 (1993)

Notes: Alloneottiosporina is characterized by hyaline, ellipsoid, clavate, subcylindrical or fusiform, euseptate conidia bearing tentaculiform or widely flared, mucoid appendages at both ends. Nag Raj (1993) discussed the differences between Alloneottiosporina and other morphologically similar genera viz. Neottiosporina, Stagonospora, Tiarospora and Tiarosporella. Two species were accepted in the genus, namely, A. carolinensis and A. infundibularis, but neither has been studied using molecular data. Li et al. (2020) collected a new species, Alloneottiosporina thailandica strain MFLUCC 15-0576 from Thailand is described. In a phylogenetic study, it formed a separate branch upper to Setophoma in Phaeosphaeriaceae (see tree below). Comparison of A. thailandica with A. carolinensis and other coelomycetes genera indicates that it fits well within the generic concept of Alloneottiosporina. The phylogenetic analysis indicates that Alloneottiosporina may be related to Phaeosphaeriaceae, but in the absence of ex-type cultures, the phylogenetic position of this genus cannot be confirmed.

Distribution: Australia, USA, Thailand (Nag Raj 1993; this study).