Dothideomycetes » Naetrocymbaceae » Bonaria

Bonaria lithocarpi

Bonaria lithocarpi (V.A.M. Mill. & Bonar) Bat., Publicações Inst. Micol. Recife 56: 439 (1959)               Fig. 22

Protopeltis lithocarpi V.A.M. Mill. & Bonar, University of Calif. Publ. Bot. 19: 412 (1941)

Index Fungorum number: IF 293763; Facesoffungi number: FoF 05164 

Epifoliar on upper and lower surface of living leaves of Lithocarpus densiflora, forming black rounded spots. Mycelium superficial, not apparently penetrating host cells. Thyriothecia 32–37 μm high × 148–161 μm diam., circular, solitary or in groups, gregarious, superficial, carbonaceous, dark brown to black, ostiolate. Peridium 6–15 μm wide, comprising a single stratum of black-brown cells of closely arranged textura angularis. Hamathecium comprising asci embedded in pseudoparaphyses. Asci 15–26 μm × 17–25 μm (x̅ = 21.3–21.4 μm, n = 10), 6-spored, bitunicate, fissitunicate, saccate, globose or subglobose to oblong, apedicellate, apically rounded and endotunica thick-walled near apex without a distinct ocular chamber. Ascospores 14–15 μm × 2–3 μm (x̅ = 14.7 × 3.3 μm, n = 10), 2 or 4 seriate, elongate-ellipsoidal, hyaline, 2–celled, slightly constricted at the septum, lower cells slightly longer than upper cell, appearing rough-walled. Asexual morph: undetermined.

Material examined – USA, California, Marin, near Inverness, on Lithocarpus densiflora (Fagaceae), March 1931, H.E. Parks. (S-F 3573, isotype).

Notes Protopeltis lithocarpi was described by Miller & Bonaria (1941). Later, Protopeltis was listed as a synonym of Myriangiella in Schizothyriaceae (von Arx & Müller 1975) and Bonaria was listed as a valid genus in Micropeltidaceae in Lumbsch & Huhndorf (2010).

Economic significance – The genus Bonaria consists of non-obligate parasites which have been reported on stems of Lachnum marginatum (Cooke) Raitv (Momei 2003).