Helotiales » Helotiales, genera incertae sedis

Libartania

Libartania Nag Raj, Can. J. Bot. 57(13): 1390 (1979)

Facesoffungi number: FoF 07431

Leotiomycetes, Leotiomycetidae, Helotiales, genera incertae sedis

 

Saprobic on the host plant. Sexual morph: undetermined. Asexual morph: Conidiomata brown to black, pycnidial, solitary to gregarious, immersed to semi-immersed or erumpent, globose to subglobose in section view, unilocular, glabrous. Ostiole absent, dehiscence by longitudinal dehiscence of apical wall. Conidiomatal wall composed of thick-walled, dark brown cells of textura angularis in the exterior, becoming thin-walled, pale brown to hyaline cells towards hymenium. Conidiophores arising all around the cavity of conidiomata, reduced to conidiogenous cells. Conidiogenous cells subhyaline to hyaline, holoblastic, monoblastic or asynchronously polyblastic, ampulliform to subcylindrical or irregular, integrated or discrete, determinate, smooth-walled, invested in mucus. Conidia hyaline, subcylindrical to fusiform, with a narrow truncate base, septate, smooth-walled, bearing tubular, branched or unbranched, attenuated, apical appendages which are separated from the conidium body by a septum; basal appendage absent or present, hyaline, short, eccentric (Nag Raj 1979, 1993).

 

Type species: Libartania laserpitii (Bres.) Nag Raj, Can. J. Bot. 57(13): 1390 (1979)

 

Notes: Libartania was introduced by Nag Raj (1979) to accommodate two taxa L. laserpitii (Bres.) Nag Raj and L. themedae (Hansf.) Nag Raj. The genus is characterized by pycnidial conidiomata, monoblastic or asynchronously polyblastic conidiogenous cells and subcylindrical to fusiform, septate conidia, bearing branched or unbranched apical appendages, rarely with a basal appendage (Nag Raj 1979, 1993). With the third species L. phragmiticola Nag Raj included, the generic concept was broadened to accommodate species with a persistent basal appendage (Nag Raj 1993). Lee and Crous (2003) added an additional species L. ischyrolepis S.J. Lee & Crous, which is distinguished from other species by its conidiomatal wall structure. Wijayawardene et al. (2017b) estimated only two taxa in Libartania, but neither listed species name nor gave any reasons. We accept four species listed above until the molecular data of these taxa are available. The sexual morph of Libartania was assigned in Phragmiticola Sherwood (Nag Raj 1993), but this connection needs verification.

 

Distribution: Australia, Canada, Italy, Latvia and South Africa (Nag Raj 1993, Lee and Crous et al. 2003).

 

 

 

References:

 

Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.

 

 

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