Truncatella Steyaert Bull. Jard. bot. État Brux. 19: 293 (1949), Index Fungorum Number: IF10328
Saprobic or mostly pathogenic on plant leaves and twigs. Sexual morph: Ascomata solitary or gregarious, scattered, immersed under minute clypeus, uniloculate, globose to subglobose, coriaceous, papillate or apapillate, brown. Ostiole central, wide, rounded. Papilla composed of cells of textura porrecta and internally lined with hyaline periphyses. Peridium comprising light yellow or brown, thick-walled cells of textura prismatica in the upper part, and thick-walled, hyaline to pale brown cells of textura angularis in other parts. Hamathecium comprising numerous, hypha-like, septate, paraphyses, slightly constricted at the septa, tapering towards the ends. Asci 8 spored, unitunicate, cylindrical to cylindrical-clavate, pedicellate, apically rounded, with a J- apical ring. Ascospores biseriate or overlapping tri-seriate, hyaline when young, sometimes pale greyish-brown with doliform median cells and yellowish to pale greyish-brown end cells or brown at maturity, fusiform, glabrous, thick-walled, straight or inequilaterally curved, with pointed ends, 1–3-septate with constrictions at the septa and bearing unbranched, terminal appendages or ornamented wall. Asexual morph: Coelomycetous. Conidiomata acervular, immersed to semiimmersed, solitary to aggregated. Peridium comprising brown, thin-walled cells of textura angularis. Conidiophores hyaline, branched, septate, cylindrical. Conidiogenous cells holoblastic, indeterminate, integrated, cylindrical, hyaline, smooth, with several percurrent proliferations. Conidia with brown median cells and hyaline apical and basal cells, fusiform, straight, 3-euseptate, constricted at the septa, sometimes with a simple or rarely branched, cellular appendage, conical at apical cell, hyaline, with 1 or more apical, simple or branched tubular appendages, smooth-walled, thick-walled,.
Type species: Truncatella truncata (Lév.) Steyaert, Bull. Jard. bot. État Brux. 19: 295 (1949)
Notes: Truncatella introduced by Steyaert (1949) and is typified by T. truncata. The genus is typically associated with plants as an endophyte or pathogen (Shoemaker et al. 1989). According to molecular studies, Truncatella is paraphyletic with Bartalinia sharing a common ancestor (Jeewon et al. 2002; Li et al. 2015a). However, Truncatella may possibly be two genera. Truncatella vitalbae (Shoemaker & E. Müll.) Shoemaker et al., T. excelsa (Petr.) Shoemaker et al., and T. pestalozzioides (Dearn. & Fairm.) Shoemaker et al. were reported as the sexual morph of Broomella (Shoemaker et al. 1989). Li et al. (2015) however, showed through molecular data that another coelomycetous species is the asexual morph of B. vitalbae. Hence the sexual morph of Truncatella still remains unresolved. Here we illustrate the sexual morph of a new Truncatella species as Truncatella spartii.
Jeewon R, Liew ECY, Hyde KD (2002) Phylogenetic relationships of Pestalotiopsis and allied genera inferred from ribosomal DNA sequences and morphological characters. Mol Phylogenet Evol 25: 378–392
Li QR, Kang JC, Hyde KD (2015) A multiple gene genealogy reveals the phylogenetic placement of Iodosphaeria tongrenensis sp. nov. in Iodosphaeriaceae (Xylariales). Phytotaxa (in press)
Shoemaker RA, Babcock CE, Müller E (1989) A new Broomella with a Truncatella anamorph on Clematis. Sydowia 41:308–313