Mycosphaerellales » Mycosphaerellaceae » Brunneosphaerella

Brunneosphaerella protearum

Brunneosphaerella protearum (Syd. & P. Syd.) Crous, in Crous et al., Stud. Mycol. 64: 31 (2009).

≡ Leptosphaeria protearum Syd. & P. Syd., Annls mycol. 10(5): 441 (1912).

            Index Fungorum number: IF 514696; Facesoffungi number: FoF 11130, Fig. 1

Description:

Pathogenic on leaf surface. Sexual morph: Ascomata 145–218.5 μm high, 170–230 μm diam., immersed under epidermis or semi-immersed to erumpent, visible as tiny black dot in leaf spot lesion, dark brown to black, uniloculate, globose to subglobose, ostiolate, papillate, clustered, gregarious. Asci 75–112× 14–20 µm, (x̄ = 79.6 × 15.1 µm, n = 10), bitunicate, fissitunicate, 8-spored, clavate to cylindric-clavate, short pedicellate, apically rounded with an ocular chamber, hamathecium. Ascospores 21–30 × 5–9 µm, (x̄ = 25.6 × 6.5 µm, n = 10), 2-seriate, hyaline, guttulate, oblong to fusiform with obtuse ends, upper cell larger than the lower cell, uniseptate, constricted at the septum. Asexual morph: Unknown.

Material examined: South Africa, Wellington, Cape Province, on leaves of Protea melaleuca (Proteaceae), 22 February 1912, Doidge Ethel M (BPI 621547).

Fig. 1 Brunneosphaerella protearum (BPI 621547). a Herbarium material. b, c Appearance of ascomata on substrate. d Vertical section through ascoma. e Peridium. f Asci stained in Melzer's reagent. g–i Asci. j–m Immature ascospores stained in Melzer's reagent. Scale bar. b = 2000 µm, c = 200 µm, d = 50 µm, e–i = 20 µm, j–m = 10 µm.

Importance and distribution

Brunneosphaerella comprises only one species causing leaf spots on Protea melaleuca (Proteaceae) in South Africa (Western Cape Province).

 

References

Crous PW, Schoch CL, Hyde KD, Wood AR et al. 2009 – Phylogenetic lineages in the Capnodiales. Studies in Mycology 64, 17–47.

Crous PW, Summerell BA, Swart L, Denman S et al. 2011 – Fungal pathogens of Proteaceae. Persoonia 27, 20–45.

 

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