Lasiostemma
Lasiostemma Theiss., Syd. & P. Syd., in Sydow & Sydow, Annls mycol. 15(3/4): 218 (1917).
Index Fungorum number: IF 2660; Facesoffungi number: FoF 03698, 6 morphological species (Species Fungorum 2022), no molecular data available.
Parasitic on leaves of Erigeron bonariensis in tropical regions. Sexual morph: Ascomata superficial, solitary to gregarious, scattered, globose to subglobose, with brown mycelium at the base, with apical ostiole, collapsing when dry, surrounded by brown setae, septate, tapering to subacute apex. Peridium comprising reddish-brown cells of textura angularis to subglobosa. Hamathecium comprising branched, septate, hyaline pseudoparaphyses. Asci 8-spored, bitunicate, fissitunicate, oblong-clavate, sessile or with knob-like pedicel, slightly curved, apically thickened, with small ocular chamber. Ascospores 2-seriate in the ascus, fusoid-ellipsoid, rounded and subacute ends, uniseptate, septum submedian, slightly constricted at the septum, hyaline, becoming brownish at maturity, minutely verrucose. Asexual morph: coelomycetous, known as Chaetosticta (adapted from Boonmee et al. 2017).
Type species: Lasiostemma melioloides (Berk. & Ravenel) Theiss., Syd. & P. Syd.
Notes: Lasiostemma is characterised by superficial, solitary to gregarious, scattered, globose to subglobose ascomata, bitunicate, fissitunicate, oblong-clavate asci and fusoid-ellipsoid,uniseptate ascospores. The asexual morph is coelomycetous and known in Chaetosticta. Hyde et al. (2013) and Boonmee et al. (2017) re-examined, and described a specimen of Lasiostemma melioloides (BPI699548). Lasiostemma is a distinct genus in Pseudoperisporiaceae. Fresh collections with DNA sequence data are needed to confirm the taxonomic placement of Lasiostemma.
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