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Lophodermium nematoideum P.R. Johnst. 1991

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Lophodermium nematoideum P.R. Johnst., New Zealand J. Bot. 29 401 (1991)

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P.R. Johnst.
P.R. Johnst.
1991
401
ICN
Lophodermium nematoideum P.R. Johnst. 1991
NZ holotype
species
Lophodermium nematoideum
HOLOTYPE: New Zealand: NORTHLAND: Russell State Forest, Punaruku Rd, Hori Wehi Wehi Tr., on Gahnia sp., coll. P. R. Johnston (R800), 11 Aug 1988 (PDD 54132).

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nematoideum

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Lophodermium nematoideum P.R. Johnst. 1991

New Zealand: NORTHLAND: Russell State Forest, Punaruku Rd, Hori Wehi Wehi Tr., on Gahnia sp., coll. P. R. Johnston (R800), 11 Aug 1988 (PDD 54132 - holotype).
Ascomata and conidiomata developing in discrete groups in undifferentiated areas of the leaf, not associated with zone lines. Ascomata 0.7-1.7 x 0.2-0.3 mm, elliptic to sublinear in outline, ends rounded. Unopened ascomata black-walled, with paler areas toward both ends of ascomata, and sometimes with indistinct paler zone along the future line of opening. Opened ascomata black-walled, with black, flattened zone along both sides of the single, longitudinal opening.

Ascomata initially subepidermal, epidermal cells becoming filled with fungal tissue as ascomata mature. Scattered fibre cells from the host leaf become trapped within the walls of the developing ascomata. In vertical section ascomata initially comprising rows of vertically oriented, hyaline cells, with the lowermost cells becoming dark brown and thick-walled. Paraphyses develop within a central cavity and, as they elongate, the lower wall becomes darker, and the epidermal cells become filled with angular, thick-walled, dark brown fungal cells. In opened ascomata both the upper and lower walls are almost entirely composed of very dark tissue with no obvious cellular structure, intermixed with fibre cells of the host leaf. A few pale, thin-walled, cylindric cells remain at the sides of the hymenium.

Paraphyses 1-1.5 µm diam., undifferentiated at apex, not extending beyond asci. Asci 70-80 x 5-6.5 µm, cylindric to subclavate, tapering slightly to broad, truncate apex, wall unthickened at apex, sometimes with small, central pore, development sequential, 8-spored, spores confined to the upper 40-50 µm of the ascus. Ascospores 30-35 x 1.5 µm, tapering toward both ends, curved or coiling on release, 1-septate, with no obvious gelatinous sheath. Conidiomata 0.3 mm diam, round in outline, pale brown with darker line around outside edge. In vertical section lenticular in shape, both upper and lower walls 5-10 µm thick, of 1-3 layers of brown to dark brown, slightly thick-walled, angular cells, the cells of the lower wall darker than those of the upper. Both upper and lower walls lined with 1-2 rows of hyaline, thin-walled cells, on which the solitary conidiogenous cells are formed. Conidiogenous cells 8-12 x 1.5-2.5 µm, cylindric or tapering to apex, proliferating sympodially, often with two developing conidia held at apex. Conidia 3-4 x 1 µm, oblong-elliptic with rounded ends, 0-septate, hyaline.

dead leaves of Gahnia sp.
Ab L. minus paraphyses non ramosis, ascis 70-80 x 5-6.5 µm, ascosporis 30-35 x 1-1.5 µm differens.

ETYMOLOGY: nematoideum = nematode-like, refers to shape of released ascospores.

NOTES: Macroscopically L. nematoideum is typical of the group of species with the pattern of ascomatal development matching L. minus (Tehon) Johnston (Johnston 1989a (as L. multimatricum Johnston), 1989b). It is easily distinguished microscopically from the other species in this group by ascospore shape and size, but is indistinguishable macroscopically from L. minus and L. breve (Berkeley) de Notaris, both also found on Gahnia.

New Zealand: NORTHLAND: Russell State Forest, Punaruku Rd, Hori Wehi Wehi Tr., on Gahnia sp., coll. P. R. Johnston (R800), 11 Aug 1988 (PDD 54132).

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Lophodermium nematoideum P.R. Johnst. 1991
Lophodermium nematoideum P.R. Johnst. 1991
Lophodermium nematoideum P.R. Johnst. 1991
Lophodermium nematoideum P.R. Johnst. (1991)
Lophodermium nematoideum P.R. Johnst. 1991
Lophodermium nematoideum P.R. Johnst. (1991)

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Lophodermium nematoideum P.R. Johnst. 1991
[Not available]

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typification
HOLOTYPE: New Zealand: NORTHLAND: Russell State Forest, Punaruku Rd, Hori Wehi Wehi Tr., on Gahnia sp., coll. P. R. Johnston (R800), 11 Aug 1988 (PDD 54132).

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1cb191b1-36b9-11d5-9548-00d0592d548c
scientific name
Names_Fungi
16 September 1993
5 May 2003
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