Hercospora Fr., Syst. orb. veg. 1: 119 (1825)
= Rabenhorstia Fr., Summa veg. Scand., Sectio Post. (Stockholm): 410 (1849)
Facesoffungi number: FoF 02250
Sordariomycetes, Diaporthomycetidae, Diaporthales, Lamproconiaceae
Saprobic on the host plant. Sexual morph: see Norphanphoun et al. (2016) and Senanayake et al. (2018). Asexual morph: Conidiomata dark blackish brown, stromatic, solitary, subepidermal to epidermal, immersed, applanate but markedly erumpent in the centre, unilocular or multilocular, convoluted, glabrous. Ostiole absent, dehiscence irregular. Conidiomatal wall composed of thick-walled, pale brown cells of textura angularis in the basal part, becoming dark brown cells of textura intricata in the lateral wall, consisting entirely of textura oblita and projecting as a cap over the dehiscent area in the upper part. Conidiophores arising from the innermost cell layer of the basal and lateral wall, hyaline, cylindrical to subcylindrical, branched extensively at the base, septate, smooth-walled, invested in mucus. Conidiogenous cells hyaline, holoblastic, cylindrical, integrated or discrete, determinate, smooth-walled, with terminal or lateral conidia formed from a branch immediately below a transverse septum. Conidia hyaline, ellipsoid, occasionally with truncate base, unicellular, contents granular, often with a central guttule, thick- and smooth-walled, produced in mucilage but without any mucilaginous envelope or appendage at maturity (Sutton 1980).
Type species: Hercospora tiliae (Pers.) Tul. & C. Tul., Select. fung. carpol. 2: 154 (1863)
= Rabenhorstia tiliae (Pers.) Fr., Summa veg. Scand., Sectio Post. (Stockholm): 410 (1849)
Notes: Rabenhorstia tiliae (Pers.) Fr. (type of Rabenhorstia), was considered as the asexual morph of Hercospora tiliae (type of Hercospora), since both fruiting bodies are frequently found together (Sutton 1980). Norphanphoun et al. (2016) and Senanayake et al. (2018) re-examined Hercospora and provided detailed descriptions of both sexual and asexual morphs. Hercospora was placed in Lamproconiaceae (Diaporthales) based on sequence data of LSU region. However, molecular data for its asexual morph is not available. Fresh collections and cultures of both morphs are necessary to confirm this connection.
Illustration of Hercospora tiliae see Senanayake et al. (2018).
Distribution: Austria, Canada, Norway, UK, USA, Sweden (Sutton 1980, Senanayake et al. 2018).
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.