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Nectria arenuloides Samuels 1976

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Nectria arenuloides Samuels, New Zealand J. Bot. 14 254 (1976)

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Samuels
Samuels
1976
254
ICN
Nectria arenuloides Samuels 1976
NZ holotype
species
Nectria arenuloides

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arenuloides

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Nectria arenuloides Samuels 1976

ADDITIONAL SPECIMENS EXAMINED: NEW ZEALAND: Auckland Province, Thames County, along Kauaeranga River, NE of Thames, on rachis of Cyathea medullaris, Dingley et al., 8 Mar. 1973 (PDD 30700, Samuels 73-8), Dingley et al., 27 Aug. 1974 (PDD 33871, Samuels 74-114) ; Thames, on Cyathea sp., Hughes, 21 Aug. 1963 (PDD 32545); Waitemata County, Cornwallis, on rotten wood, Hughes, 29 Aug. 1963 (PDD 23585); Waitakere Ranges, Piha Valley, on midrib of Rhopalostylis sapida, Brook, Jan. 1956 (PDD 15910).

CONIDIAL STATE: Acremonium sp.

Mycelium a fringe of white hyphae surrounding the base of each perithecium, not visible elsewhere, Perithecia solitary; at first white, becoming orange, glabrous and scaly, globose to tympaniform 250-310 tom diam., becoming collabent when dry, not changing colour in 3% potassium hydroxide. Perithecial wall 50-65 µm thick. Surface view: cells pseudoparenchymatous, 7-15 µm in greatest, dimension, walls 0.5-1.0 µm thick. Longtitudinal section: outer region 20-30 µm wide, cells elliptical, 5-15 µm long, 3-5 µm wide, walls 0.5-1.0 µm thick and pigmented; inner region 20-30 µm wide, cells elongated and compressed, outline of individual cells not apparent, walls 1-2 µm thick. Perithecial papilla lacking, ostiolar opening formed by narrow hyphal elements arising from the inner region of the Perithecial wall; ostiolar canal periphysate. Asci clavate, 60-80 (-100) x (9-) 10-18 An, 8-spored; apices rounded, immature asci appearing to have a pore that is not visible at maturity; bases rounded, ascospores biseriate, forming throughout the length. Ascospores fusiform, straight or curved, (13-) 19-22 (-24) x (3.5-) 4-1.5 (-5) µm, equally 2-celled, 4 striate, not constricted at the septum, hyaline.

CHARACTERISTICS IN CULTURE CMD: Ascospores germinating in low percentage overnight. Colonies 4-5 cm diam., transparent, white, aerial mycelium sparse, margin entire, aromatic, medium non-pigmented. Perithecia forming within 6-8 weeks in cultures derived from single ascospores. ME: 2.5-3 cm diam., barely transparent to translucent, white, aerial mycelium sparse, margin entire, aromatic, medium non-pigmented. OA: 3 cm diam., opaque; white, becoming pale pink; aerial mycelium dense, forming hyphal, rope-like strands; margin entire to slightly undulate, aromatic, medium non-pigmented. Perithecia forming within 6-8 weeks in cultures derived from solitary ascospores. WAS: 3 cm diam., transparent, aerial mycelium sparse, margin entire, non-aromatic, medium non-pigmented. Perithecia forming within 6 weeks in cultures derived from solitary ascospores. Phialophores arising on CMD, ME, OA, and WAS, forming from the surface of the agar and from the aerial mycelium; monophialidic, unbranched, 1-3 septate, straight, smooth, 70-110 jm long, 3-4 µm wide basally, subtending hypha 3-4 µm wide. A solitary phialide constituting the terminal 50-60 (-80) µm of each phialophore, 2-3 µm wide at the unflared or slightly flared tip. Conidial production sparse. Phialoconidia allantoid, elliptical to nearly cylindrical, (7-) 10-12 (-13) x (2.5-) 3-3.5 (-4) µm, unicellular, hyaline, with a slightly protuberant, flattened, basal abscission scar. Arising in basipetal succession, held in a solitary drop of hyaline liquid.

HABITAT: On rachises of Cyathea spp. and on rotting wood.
Perithecia globosae vel tympaniformae, 250-310 µm diametro, aurantia; asci clavati, 50-60 x 8-10 µm, apice simplice; ascosporee aeque bicellulares, fusiformae, rectae vel curvatae, 19-22 x 4-4.5 µm hyalinae, striatae. HOLOTYPUS: PDD 32560.
NOTES: Nectria arenuloides is closely related to N. arenula. I have collected N. arenula three times in New Zealand (PDD 30701, 31886, 31887) ; all three are on dead leaves of Phormium tenax and produced a monophialidic species of Cylindrocarpon in isolates derived from solitary ascospores. N. arenuloides differs from N. arenula in its wider perithecial wall, longer ascospores, and Acremonium conidial state. N. arenula has been described and illustrated by Booth (1959).
HOLOTYPE : NEW ZEALAND: Auckland Province, Waitemata County, Waitakere Ranges, Huia Rd, Kakamatua Stream, on rachis of Cyathea dealbata, Samuels 74-41 & Kendrick, 5 Apr. 1974 (PDD 32560).

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Nectria arenuloides Samuels 1976
Nectria arenuloides Samuels (1976)

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Nectria arenuloides Samuels 1976
New Zealand
Auckland
Nectria arenuloides Samuels 1976
New Zealand
Coromandel
Nectria arenuloides Samuels 1976
New Zealand
Northland
Nectria arenuloides Samuels 1976
New Zealand
Westland

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1cb19530-36b9-11d5-9548-00d0592d548c
scientific name
Names_Fungi
12 November 1999
1 May 2003
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