Pseudolachnella Teng, Sinensia, Shanghai 7: 775 (1936)
Facesoffungi number: FoF 07542
Sordariomycetes, Sordariomycetidae, Chaetosphaeriales, Chaetosphaeriaceae
Saprobic on bamboo hosts, such as Phyllostachys nigra var. henonis, Phyllostachys sp., Pleioblastus hindsii, P. linearis, P. simonii, Sasa kurilensis, Sinobambusa tootsik (Poaceae) (Nag Raj 1993, Hashimoto et al. 2015). Sexual morph: undetermined. Asexual morph: Conidiomata dark brown to black, stromatic, cupulate, solitary to gregarious, or confluent, initially closed and pulvinate, conical to subcupulate, later opening wide to become shallow-cupulate with incurved margins, unilocular, setose. Conidiomatal wall composed of basal stroma and excipulium; basal stroma of textura angularis to textura intricata or textura epidermoidea with thick-walled, brown cells; excipulum well developed, of textura porrecta with thick-walled and dark brown to hyaline cells, giving rise to numerous setae. Conidiomatal setae restricted to the margin of the conidiomata, at first incurved over the conidial hymenium, then divergent, cylindrical, straight or slightly curved, unbranched, aseptate, becoming progressively paler towards the interior, thick-walled, acute and narrowed at apex. Conidiophores arising from the innermost layers of basal stroma and excipulum, hyaline, cylindrical to subcylindrical, broader at base, branched. Conidiogenous cells hyaline, enteroblastic, phialidic or annelidic, cylindrical to lageniform, indeterminate, discrete or integrated, smooth, thick-walled. Conidia hyaline, fusiform to naviculate or cylindrical, 3–7-septate, straight or curved, guttulate, smooth-walled, bearing flexuous, branched or unbranched, centric or excentric, single or multi-appendages, arising from the top of the apical cell or adjacent to apical and basal cell.
Type species: Pseudolachnella scolecospora (Teng & C.I. Chen) Teng, Sinensia, Shanghai 7: 775 (1936)
Notes: Pseudolachnella was proposed by Teng (1936) for Pseudolachnella scolecospora (Teng & C.I. Chen) Teng, a segregated species from Pseudolachnea Ranoj. The genus is characterized by cupulate, setose conidiomata and multi-septate conidia, and its host specific habitat (occurring on bamboo host only) (Nag Raj 1993, Hashimoto et al. 2015). Pseudolachnella can be easily confused with Pseudolachnea, since both genera have cupulate, conidiomata with numerous, black setae. Sutton (1977a, 1980) regarded these two as congeneric and synonymized Pseudolachnella under Pseudolachnea. However, Nag Raj separated Pseudolachnella from Pseudolachnea on the basis of the conidial septation (1-sepate in Pseudolachnea vs multi-sepate in Pseudolachnella). This generic concept was followed by Zhao et al. (2004) and Sato et al. (2008). In addition, they described two new species, P. vermospora R.L. Zhao, et al. and P. yakushimensis G. Sato et al. Recently, Hashimoto et al. (2015) revised Pseudolachnea and Pseudolachnella based on molecular data and morphology, and concluded that differences in conidiomata structure (thickness of basal stroma and excipulum) between these genera are more reliable indicators of evolutionary relationship than conidial septation. In addition, eight species were described from bamboo host in Pseudolachnella. Li et al. (2016) added an additional species P. brevifusiformis A. Hashim. & Kaz. Tanaka from a dead sheath of Pleioblastus linearis (Hack.) Nakai. Pseudolachnella guaviyunis Marinc. et al. (Crous et al. 2014b) was excluded from the genus, based on its distinct phylogeny and morphology (pale brown smooth to verruculous conidia ).
Distribution: China, India, Japan (Nag Raj 1993, Hashimoto et al. 2015, this study).
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.