Broomella Sacc., Syll. fung. (Abellini) 2: 557 (1883), Indexfungorum number: IF658
= Keissleria Höhn., Annls mycol. 16 (1/2): 93 (1918)

Saprobic on various hosts. Sexual morph: Ascomata solitary to gregarious, uniloculate, glabrous, globose to subglobose, papillate. Ostiole centrally located, composed of longitudinally aligned cells, and internally lined with hyaline periphyses. Peridium composed of light yellow, thick-walled cells of textura prismatica in the upper part and surrounding the ostiole, and thin-walled, hyaline to pale brown cells in other parts. Hamathecium comprising numerous, cylindrical, hypha-like, septate, paraphyses tapering towards the ends. Asci 8-spored, unitunicate, cylindrical to cylindrical-clavate, pedicellate, apically rounded, with a J- apical ring. Ascospores biseriate or overlapping bi- or tri-seriate, pale greyish brown, or brown, with ends cells yellowish to pale grayish brown, fusiform, glabrous, straight or inequilaterally curved, 3- septate, constricted at the septa, thick-walled, with doliform median cells, end cells conical, each bearing an unbranched, terminal tubular appendage. Asexual morph: Coelomycetous. Conidiomata stromatic, pycnidioid, scattered to gregarious, immersed to semi-immersed, rounded, oval or elongated, black, unilocular, papillate, glabrous. Pycnidial wall comprising thick-walled cells of textura globulosa to textura angularis, outwardly pale brown to brown, inwardly merging with relatively thin-walled and colourless cells. Conidiophores reduced to conidiogenous cells. Conidiogenous cells integrated, cylindrical, phialidic, percurrently proliferating 1–2-times, hyaline, smooth. Conidia pale brown or brown, fusiform to aciculate, with acute ends, straight or slightly curved, 3-septate, constricted at septa, verruculose, thick-walled, bearing a single tubular appendage at each end, or 2–5-appendage at apex and a single appendage at the base.

Type: Broomella vitalbae (Berk. & Broome) Sacc., Syll. fung. (Abellini) 2: 558 (1883)

Notes: Broomella was introduced by Saccardo (1883) based on B. vitalbae (Berk. & Broome) Sacc. The genus is characterized by unitunicate, cylindrical-elongate asci, with a J-, discoid apical ring, and 3-septate, ellipsoid-fusiform ascospores, with brown median cells, lighter terminal cells, and single, centric appendages arising from the ends (Shoemaker and Müller 1963; Li et al. 2015). Broomella has been shown to be linked to a pestalotiod-like asexual morph (Shoemaker et al. 1989; Yuan and Zhao 1992; Kang et al. 1999). Shoemaker and Müller (1963) introduced B. acuta Shoemaker & E. Müll. and B. excelsa Shoemaker & E. Müll. in the genus. There are 20 species epithets listed under Broomella in Index Fungorum (2015), however, none of these had been studied using sequence data. The Broomella species and their truncatella-like asexual morphs differ in various ways from the type species of Broomella and its asexual morph and are probably not congeneric. Through a study of LSU sequence data and together with existing morphological data, Li et al. (2015) showed that Broomella appears to be a distinct, natural group in Amphisphaeriaceae and the asexual morph have conidia with a single apical and basal appendages.

References

Kang JC, Hyde KD, Kong RYC (1999) Studies on Amphisphaeriales l: the Clypeosphaeriaceae. Mycoscience 40:151–164

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)

Saccardo PA (1883) Sylloge pyrenomycetum. Vol. II. Syll. Fung. 2:1–813

Shoemaker RA, Babcock CE, Müller E (1989) A new Broomella with a Truncatella anamorph on Clematis. Sydowia 41:308–313

Shoemaker RA, Müller E (1963) Generic correlations and concepts: Broomella and Pestalotia. Can J Bot 41:1235–1243

Yuan ZQ, Zhao ZY (1992) A new species of Broomella and its new anamorph on Clematis from China. Sydowia 44:90–99

 

Species

    • Broomella vitalbae