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Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf. 1993

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Crous, F.A. Ferreira, Alfenas & M.J. Wingf.
Crous, F.A. Ferreira, Alfenas & M.J. Wingf.
1993
707
ICN
Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf. 1993
Espírito Santo, Brazil
species
Mycosphaerella suberosa

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Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf. 1993

Eucalyptus muelleriana A. W.Howitt SPECIMENS EXAMINED: Northland, Kaikohe, Knudsen Road, on living leaves of Eucalyptus muelleriana, C. Inglis, 27 May 1998, NZFRI-M 3827, culture NZFS 335.01; Northland, Kaikohe, Knudsen Road, on living leaves of E. muelleriana, C. Inglis, 26 Aug 1998, NZFRI-M 3863, culture NZFS 335.00.

Leaf spots epiphyllous, eventually becoming amphigenous, circular, 5-15 mm in diameter, becoming confluent, dark brown and corky with a diffuse yellow-red margin on the adaxial surface, abaxial surface discoloured and eventually becoming necrotic. Pseudothecia initially epiphyllous, eventually becoming amphigenous, numerous, discrete but densely scattered, black, globose, 60-70 µm wide, intraepidermal becoming erumpent, ostiole non-papillate, wall of variable thickness, thinnest at the base and thickest at the ostiole. Asci bitunicate, subsessile, 8-spored, ellipsoid to obclavate, straight or slightly curved, 30-40 x 1216 µm. Ascospores bi- to multi-seriate, guttulate, hyaline, smooth, obtuse at each apex, medianly 1septate, constricted at the septum, widest in the middle of the apical cell, tapering towards each apex but the taper more pronounced in the basal cell, 10-17 x 3-6 µm, with mucoid sheath. Anamorph not observed.

ASCOSPORE GERMINATION: Ascospores germinating after 48 h on water agar, becoming slightly piµmented and often with several germ tubes emanating from each of the two cells. Germ tubes form randomly and produce numerous septa. Ascospores become very distorted after forming 3-4 septa.

CULTURE: Colony diameter <5 mm after one month on 3% malt extract agar at 25°C in the dark, dull black, colony surface raised with a hard texture, aerial mycelium sparse. Margin entire, crenate and slightly appressed.

NOTES: The morphological characters of M. suberosa from the New Zealand collections are compared with descriptions of the fungus from Australia and South America in Table 1. The presence of sheaths around the ascospores has not been recorded elsewhere and the ascospores became light brown rather than dark brown on germination. Carnegie et al. (1997) reported that in the Australian collection the two original cells of the ascospore became verruculose after germination. This was not reported in the original description (Crous et al. 1993a) and was not observed in the New Zealand collections. However, Carnegie et al. (1997) reported a personal communication from P. W. Crous that this can occur in the type material. Ascospores from the New Zealand collections were germinated on water agar in contrast to the 2% MEA used by Crous et al. (1993a) and Carnegie et al. (1997), which may account for the differences in germination. Cultural characteristics were similar to those described by both Crous et al. (1993a) and Carnegie et al. (1997).
The pseudothecia are also slightly smaller, but the New Zealand collections generally agree with the previously published descriptions of M. suberosa (Table 1). The small differences in the morphological characters of the New Zealand fungus may be attributable to its presence on a host on which it has not previously been recorded. It is of interest to note that the hosts on which M. suberosa has been found in South America, Indonesia, and Australia (E. dunnii, E. globulus, E. grandis, E. moluccana, E. saligna, E. viminalis) belong to Eucalyptus subgenus Symphyomyrtus, whereas the New Zealand host, E. muelleriana, is in Eucalyptus subgenus Eucalyptus (Brooker 2000).
The New Zealand cultures of M. suberosa have been examined by A. W. Milgate (University of Tasmania) and the 5.8S and flanking ITS 1 and ITS2 regions of the rDNA sequenced for comparison with isolates of Australian Mycosphaerella species. The sequence from the New Zealand isolates of M. suberosa was identical with that from the Western Australian isolate of M. suberosa (VPRI 20605) described by Carnegie et al. (1997) (A. W. Milgate pers. comm.).

Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf. 1993

Type: Foliicolous Fungi; Description: Ascomata perithecial, densely scattered, intraepidermal, becoming erumpent, globose, black, 60–70 μm wide, ostiolate; on circular, 5–15 mm diameter, dark brown and corky spots with a diffuse yellow-red margin, on the upper surfaces of leaves; on lower surfaces the spots appear as discoloured, necrotic areas. Asci ellipsoid to obovate, 30–40 × 12–16 μm. Ascospores ellipsoid, 1-septate, 10–17 × 3–6 μm, ends obtuse.
Distribution: Northland, Coromandel, Bay of Plenty.; 1st Record: Dick & Dobbie (2001).
Significance: Causes little damage.; Host(s): Eucalyptus muelleriana.

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Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf. 1993
Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf. (1993)
Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf. 1993
Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf.
Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf. 1993
Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf.
Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf. 1993
Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf. (1993)
Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf. 1993
Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf. (1993)
Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf. 1993
Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf. (1993)
Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf. 1993
Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf. (1993)
Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf. 1993
Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf.
Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf. 1993
Mycosphaerella suberosa Crous, F.A. Ferreira, Alfenas & M.J. Wingf. (1993)

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1cb1b4ef-36b9-11d5-9548-00d0592d548c
scientific name
Names_Fungi
7 February 2000
5 February 2015
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