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Monostichella nothofagi P.R. Johnst. 1999

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Threat status: Data deficient
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Monostichella nothofagi P.R. Johnst., New Zealand J. Bot. 37 709 (1999)
Monostichella nothofagi P.R. Johnst. 1999

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Endemic
Present
New Zealand
Political Region

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P.R. Johnst.
P.R. Johnst.
1999
709
ICN
Monostichella nothofagi P.R. Johnst. 1999
species
Monostichella nothofagi

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nothofagi

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Monostichella nothofagi P.R. Johnst. 1999

Type: Foliicolous Fungi; Description: Conidiomata acervular, solitary, subcuticular, pustulate, circular, black, opening by one or more splits, 0.15–0.4 mm in diameter; on round, pale brown leaf spots, 0.4–0.8 mm in diameter, on upper surfaces of leaves; each leaf spot has a single conidioma in the centre. Conidia cylindrical, slightly curved, 0-septate, 19–27 × 5–7 μm, base truncate, often with a small frill, smooth, hyaline.
Distribution: Buller.; 1st Record: Johnston (1999).
Significance: None.; Host(s): Nothofagus menziesii.

Monostichella nothofagi P.R. Johnst. 1999

Spots on upper surface of living leaves, 0.4-0.8 mm diam., round in outline, central part with a single, black, pustulate conidioma, outer part pale brown, with diffuse margin. Conidiomata 0.15-0.4 mm diam., round in outline, pustulate, black, opening by one or more irregular splits.

Conidiomata uniloculate, subcuticular. Upper wall comprises a layer 4-6 µm thick of dark material with no obvious cellular structure, lining the host cuticle. Lower wall rests on more or less intact host epidermal cells (epidermal cells and uppermost layer of hypodermal cells beneath conidioma packed with yellow material, but not containing fungal hyphae), 12-20 µm thick, comprising 2-4 layers of angular to isodiametric cells 5-6 µm diam. with very pale brown walls.

Conidiogenous cells 11-12.5 x 5-6.5 µm, short-cylindric, solitary, with a broad, single, apical conidiogenous locus, wall slightly thickened immediately below point where conidia are released. Conidia 19-27 x 5.5-7 µm, cylindric, slightly curved, apex rounded, base with truncate scar, and often with a small frill, wall hyaline, smooth, 0-septate.

Maculae 0.4-0.8 mm diam., rotundatae, nigrae versus centrum, brunneolae versus margine diffusum. Conidiomata 0.15-0.4 mm diam., rotundata, nigra, subcuticularia. Cellulae conidiogenae 11-12.5 x 5-6.5 µm, cylindricae, discretae. Conidia 19-27 x 5.5-7 µm, cylindrica, curva leviter, apice rotundato, base truncata.

The coelomycete genus Monostichella Höhn. includes leaf pathogens which form subcuticular, acervular conidiomata having short-cylindric conidiogenous cells with percurrent proliferation at the broad, single, apical conidiogenous locus, and large, non-septate, hyaline conidia with a truncate base (Sutton 1980). M. nothofagi is the second Monostichella species to have been reported from the Fagaceae, M. falcata (Dearn. & House) Arx having been described from Lindera from North America. Based on the description of Arx (1980), the two species are macroscopically similar, but they are clearly distinguished by conidial shape (Arx 1980, Morgan-Jones 1971).

In many features M. nothofagi is both macroscopically and morphologically similar to the Baeumleria species discussed in this paper. The Baeumleria species differ in having the upper wall of the conidiomata with a distinctly cellular structure.

New Zealand, Buller, Giles Creek coalmine, restoration plantings, on living leaves Nothofagus menziesii, P.R. Johnston & C.W. Ross, 5 Oct 1998, PDD 69287.

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Monostichella nothofagi P.R. Johnst. 1999
Monostichella nothofagi P.R. Johnst. (1999)
Monostichella nothofagi P.R. Johnst. 1999
Monostichella nothofagi P.R. Johnst. (1999)
Monostichella nothofagi P.R. Johnst. 1999
Monostichella nothofagi P.R. Johnst. (1999)
Monostichella nothofagi P.R. Johnst. 1999
Monostichella nothofagi P.R. Johnst. (1999)
Monostichella nothofagi P.R. Johnst. 1999
Monostichella nothofagi P.R. Johnst. (1999)

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Monostichella nothofagi P.R. Johnst. 1999
New Zealand
Buller
Monostichella nothofagi P.R. Johnst. 1999
New Zealand
Westland

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1cb19416-36b9-11d5-9548-00d0592d548c
scientific name
Names_Fungi
18 January 2000
22 March 2001
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