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Lasionectriella arenuloides (Samuels) L.W. Hou, L. Cai & Crous 2023

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Lasionectriella arenuloides (Samuels) L.W. Hou, L. Cai & Crous in Hou et al., Studies in Mycology 105 99 (2023)
Lasionectriella arenuloides (Samuels) L.W. Hou, L. Cai & Crous 2023

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Endemic
Present
New Zealand
Political Region

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(Samuels) L.W. Hou, L. Cai & Crous
Samuels
L.W. Hou, L. Cai & Crous
2023
99
ICN
species
Lasionectriella arenuloides

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arenuloides

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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).
MATERIAL EXAMINED: NEW ZEALAND, North Island, Auckland Region, Hunua Ranges, Wairou-Cosseys Track, on decaying leaves of Freycinetia banksii, 9 May 1996, S.R. Whitton HKU(M)5051 (IFRD210-019); North Island, Auckland Region, Hunua Ranges, Workman Track, decaying leaves of F. banksii, 8 May 1996, S.R. Whitton HKU(M)5049 (IFRD210-017). NOTES: Hydropisphaera arenuloides is characterised by globose ascomata that are sessile and more or less glabrous. Asci are 60–100 × 9–18 µm and ascospores are 13–24 × 3.5–5 µm, fusiform, 1-septate, not constricted at the septum and striate (Samuels, 1976a). Based on ascomatal morphology and dimensions, these specimens are best treated as H. arenuloides. No taxonomically significant differences between the current specimens and those reported by Samuels (1976a) were observed.

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Hydropisphaera arenuloides (Samuels) Rossman & Samuels 1999
Lasionectriella arenuloides (Samuels) L.W. Hou, L. Cai & Crous 2023
Lasionectriella arenuloides (Samuels) L.W. Hou, L. Cai & Crous 2023
Lasionectriella arenuloides (Samuels) L.W. Hou, L. Cai & Crous 2023
Lasionectriella arenuloides (Samuels) L.W. Hou, L. Cai & Crous 2023
Nectria arenuloides Samuels 1976
Lasionectriella arenuloides (Samuels) L.W. Hou, L. Cai & Crous 2023

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74ff83ac-973b-4ba3-8b91-9cfc520e6704
scientific name
Names_Fungi
3 July 2023
3 July 2023
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