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Coccomyces libocedri P.R. Johnst. 1986

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Coccomyces libocedri P.R. Johnst., New Zealand J. Bot. 24 105 (1986)
Coccomyces libocedri P.R. Johnst. 1986

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Endemic
Present
New Zealand
Political Region

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P.R. Johnst.
P.R. Johnst.
1986
105
ICN
Coccomyces libocedri P.R. Johnst. 1986
NZ holotype
species
Coccomyces libocedri

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libocedri

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Coccomyces libocedri P.R. Johnst. 1986

New Zealand: TARANAKI: Mt. Egmont, Potaema Swamp, on Libocedrus bidwillii, P. R. Johnston, G. J. Samuels, R. H. Petersen, 25.IV.1983 (PDD 45273). TAUPO: Tongariro National Park, Track from Erua to Hauhangatahi Summit near tree line, on Libocedrus bidwillii, P. R. Johnston, E. H. C. McKenzie, P. K. Buchanan, 20.III.1984 (PDD 45274). OTAGO: Dunedin, Mt. Cargill, near summit, on Libocedrus bidwillii, P. R. Johnston, 14.V.1984 (PDD 45275 - Holotype).
Ascocarps form in pale, brownish lesions on fallen leaves. Lesions not associated with zone lines. Ascocarps ovate to oblong or irregular in outline, 0.6-0.8 x 0.4-0.5 mm diam. Walls pale grey, no paler zones to indicate future lines of opening, darker around the outside edge. Opening by several irregular, radiate slits, to expose the yellowish hymenium. Lip cells absent. Pycnidia numerous, round, 0.2 mm diam., flat, pale walled, darker around the outer edge and the single, round ostiole.

Ascocarp intraepidermal. In vertical section upper stromatal layer 15-20 µm wide, comprising rounded, pale brown, thin walled cells. An extra laver of hyaline, gelatinous cells developing between the upper stromatal layer and the covering host tissue. Lower stromatal layer 15 µm wide, comprising 3-4 layers of dark brown, thick walled cells. Excipulum absent.

Paraphyses 2 µm diam., becoming irregularly tangled and swollen up to 4.5µm diam. at apices, extending 15-20 µm beyond asci. Asci cylindric, 195-235 x 9-10.5 µm, tapering slightly to a broad, truncate apex, uniformly thin walled, non-amyloid, 8-spored. Ascospores filiform, 142-206 x 1.8-2 µm, not tapering, 0-3 septate, surrounded by a poorly developed gelatinous sheath.

Pycnidia intraepidermal, flat and lenticular in shape, upper wall absent. Lower wall 7-12 µm wide, of 1-3 layers of dark brown, thick walled cells, 3-5 µm diam., lined with 1-2 layers of hyaline cells, on which the conidiogenous layer forms. Conidiogenous cells 8-12 x 1.5-2 µm, solitary, cylindric to flask-shaped, sympodial. Conidia cylindric with rounded ends, 4-6 x 1 µm, hyaline, non-septate.

CHARACTERISTICS IN CULTURE: Ascospores germinating on agar plates after 48 h. Cultures on oatmeal agar 3.5-4 cm diam. after 6 weeks; aerial mycelium tufted, pale grey, in two concentric bands; agar surface undulate, dark brown in colour, fruiting bodies appear to be forming near edges of colonies, but remaining sterile.

Found only on dead leaves of Libocedrus bidwillii, still attached to the plant.
Ascocarpi orbiculate vel inaequales, 0.6-0.8 x 0.4-0.5 mm diam., grisei. Paraphyses filiformes, apice ad 4.5 µm incrassatae; asci cylindrici, 195-235 x 9-10.5 µm; ascosporae 142-206 x 1.8-2 µm.

ETYMOLOGY: libocedri; refers to host plant.

NOTES: The ascocarp is similar in external appearance to C. cupressinum, but the two species are easily distinguished microscopically. Lophodermium juniperi (Greville) Darker is recorded from Libocedrus decurrens Torr. (Hunt & Ziller 1978).

This species has lip cells lining the single opening slip, asci 110-130 x 15-17 µm, and ascospores 70-90 x 2-3 µm. Two species, described as Hypoderma by Butin (1970) from Pilgerodendron species, have saccate asci and ascospores less than 50 µm long.

PDD 45275 ex Libocedrus bidwillii Hook. f.

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Coccomyces libocedri P.R. Johnst. 1986
Coccomyces libocedri P.R. Johnst. (1986)
Coccomyces libocedri P.R. Johnst. 1986
Coccomyces libocedri P.R. Johnst. (1986)
Coccomyces libocedri P.R. Johnst. 1986
Coccomyces libocedri P.R. Johnst. (1986)
Coccomyces libocedri P.R. Johnst. 1986
Coccomyces libocedri P.R. Johnst. 1986
Coccomyces libocedri P.R. Johnst. 1986
Coccomyces libocedri P.R. Johnst. (1986)

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Coccomyces libocedri P.R. Johnst. 1986
New Zealand
Dunedin
Coccomyces libocedri P.R. Johnst. 1986
New Zealand
Taranaki
Coccomyces libocedri P.R. Johnst. 1986
New Zealand
Taupo

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1cb183bf-36b9-11d5-9548-00d0592d548c
scientific name
Names_Fungi
18 October 1993
15 December 2003
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