Fungalpedia – Note 620, Lembosia
Lembosia Lév.
Citation when using this data: D. S. Marasinghe et al. 2023 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank.
Classification: Asterinaceae, Asterinales, Dothideomycetidae, Dothideomycetes, Pezizomycotina, Ascomycota, Fungi
Epiphytic on the living leaves. Superficial hyphae with lateral appressoria. Sexual morph: Thyriothecia superficial, solitary to scattered, blackened, oval to ellipsoidal, X- or Y-shaped, opening by a linear fissure, poorly developed basal layer. Upper wall comprising linear, darkened cells, which are branched at the margin. Hamathecium lacking pseudoparaphyses. Asci bitunicate, 8-spored, globose or sub globose to ovoid, apedicellate, apical region of asci usually with a thick opaque region, ocular chamber and fissitunicate dehiscence not observed. Ascospores over- lapping, 1-septum, oblong to obvoid, initially hyaline becoming to brown, smooth or slightly rough-wall, with or without a mucilaginous sheath when immature. Asexual morph: Undetermined (Hongsanan et al. 2014a; Marasinghe et al. 2021b).
Notes: Lembosia was introduced by Léveillé (1845) with the type species L. tenella. This genus is morphologically similar to Asterina in having superficial hyphae with appressoria, globose to subglobose asci and 1-septum, brown ascospores (Hosagoudar et al. 2001). However, Lembosia differs from Asterina in having elongated thyriothecia opening by a longitudinal slit (Hongsanan et al. 2014a). Lembosia morphologically resembles Cirsosia by elongated thyriothecia with longitudinal fissure, 8-spored, globose to sub globose asci and 1-septum, brown, conglobate ascospores (Fig. 1). However, Lembosia has lateral appressoria and Cirsosia has intercalary appressoria. The asexual morph of Lembosia has not been recorded so far.
Type species: Lembosia tenella Lév., Annls Sci. Nat., Bot., sér. 3 3: 58 (1845).
Other accepted species: Species Fungorum – search Lembosia.
Figure 1 – Lembosia humboldtiicola. a Thyriothecium. b Apprssoriate hyphae. c Ascus. d Ascospores. Scale bars: a = 29 μm, b = 6 μm, c, d = 8 μm. Redrawn from Hosagoudar (2012)
References
Hongsanan S, Li YM, Liu JK et al 2014a – Revision of genera in Asterinales. Fungal Divers 68:1–68.
Hosagoudar VB 2012 – Asterinales of India. Mycosphere 2:617–852.
Léveillé JH 1845 – Champignons exotiques. Ann Sci Nat Ser 3(3):38–71.
Entry by
Diana Sandamali Marasinghe, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand School of Science, Mae Fah Luang University, Chiang Rai, 57100, Thailand, Mushroom Research Foundation, 128 M.3 Ban Pa Deng T. Pa Pae, A. Mae Taeng, Chiang Mai, 50150, Thailand
Published online 29 August 2023