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Austropaxillus mcnabbii (Singer, J. García & L.D. Gómez) Jarosch 2001

Scientific name record
Names_Fungi record source
Is NZ relevant
This is the current name
This record has collections
This record has descriptions
This is indigenous

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Austropaxillus mcnabbii (Singer, J. García & L.D. Gómez) Jarosch 2001
Austropaxillus mcnabbii (Singer, J. García & L.D. Gómez) Jarosch 2001

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Indigenous, non-endemic
Present
New Zealand
Political Region
Also present in Australia

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(Singer, J. García & L.D. Gómez) Jarosch
Singer, J. García & L.D. Gómez
Jarosch
2001
92
ICN
species
Austropaxillus mcnabbii

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mcnabbii

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Additional material. — NEW ZEALAND: South Island: Canterbury: Thompson River, Waimakariri River, under Nothofagus solandri var. cliffortioides, 26.III.1968, leg. BAKER (ZT 68/219).  -Craigieburn, near Base Camp, 1000 m, under Nothofagus solandri var. cliffortioides, 19.IV.1968, leg. BAKER (ZT 68/275). -Nelson: Lake Rotoiti, Westbay, under Nothofagus solandri var. cliffortioides, 3.V.1968, leg. HORAK (ZT 68/355).

COLLECTIONS EXAMINED: Under (1) N. fusca. Nelson: Lake Daniels Track, 15.v.1969, R. F. R. McN.; (2) N. fusca and N. menziesii. Nelson: Maruia, 6.v.1968, R. F. R. McN.: (3) N. menziesii and N. solandri, Canterbury: Lewis Pass near Dan's Bridge, 7.v.1968, R. F. R. McN.; Boyle River, 25.iv.l969, R. F. R. McN.: (4) N. menziesii and N. solandri var. cliffortioides, Canterbury: near Cass, 31.iii.l968, M. J. Noonan

(ISOTYPE, PDD 26294).

PILEUS: convex when young, becoming centrally depressed, infundibuliform, or irregularly infundibuliform at maturity, 3-8.5 cm diam., dry, tomentose, felted, velutinate, or finely squamulose, often circumferentially creviced and exposing the white context or centrally squarrose at maturity, white with yellow tints when young, yellowish orange, yellowish brown, yellow, or golden yellow at maturity, squamules when present darker brown; cuticle a poorly organised trichodermium when young, at maturity composed of repent or obliquely ascending filamentous hyphae with simple septa and yellowish brown contents, terminal cells cylindrical or tapering apically, thin-walled or slightly thick-walled, often externally roughened, 7-12.5 µm. diam.; margins strongly to moderately involute when young, often undulate and irregularly lobed at maturity. LAMELLAE: moderately crowded, deeply decurrent, repeatedly dichotomously branched 4-(5) times, not anastomosing or meruloid near stipe, 2-4 mm deep, dull creamy yellow when young, golden yellow at maturity, paling near margins of pileus, unchanging where damaged, lamellulae absent. STIPE: 1.5-4 cm long, tapering basally, 0.5-1 cm diam, apically, 0.5-0.75 cm diam. basally, central or occasionally eccentric, solid or slightly hollowed at maturity, dry, finely velutinate-subtomentose near apex by presence of short, septate, filamentous hyphae 4-7.5 µm. diam. with yellowish brown contents, otherwise subglabrous, yellowish white when young, often with yellowish brown stains, more or less concolorous with pileus at maturity; flesh white to sordid brownish white, unchanging on exposure to air; basal mycelium white; veil absent. SPORES: spore print orange-brown (Amber Brown); spores golden melleous to bright rusty brown, broadly elliptic-subfusiform, suprahilar depression or applanation typically present, apiculate, germ pore absent, 11.5-14-(15.5) X 4.8-6 µm, moderately thick-walled, smooth. HYMENIUM: basidia hyaline, sub-clavate to clavate, 42-58 X 7.5-10 µm, 4-spored; cystidia absent but paraphysis like structures of irregular diam. present, occasionally clavate structures with mucronate apices present but not projecting beyond basidia. HYMENOPHORAL TRAMA: bilateral, mediostratum of moderately loosely interwoven, longitudinal hyphae, lateral stratum of closely interwoven hyphae; clamp connections absent. CONTEXT OF PILEUS: white, yellowish around larvae tunnels, unchanging on exposure to air. SMELL: not distinctive. TASTE: bitter. CHEMICAL CHARACTERS: KOH on pileus— reddish brown; on context—yellow; NH4OH on pileus—orange-brown or reddish brown with a reddish or pinkish orange flush; on context—no reaction or faintly yellow.
HABITAT: Gregarious or caespitose under Nothofagus.
Pileus infundibuliformis, 3-8.5 cm diam., siccus, coactus, tomentosus vel centraliter squarrosus ubi maturus, flavus, aureus vel subfulvus. Lamellae decurrentes, bipartito furcatae 4-(5) vicibus, ad 4mm altae, aureae. Stipes 1.5-4 cm longus, basaliter decrescens, 0.5-1 cm diam., siccus, subglaber, plus minusve concolor cum pileo. Sporae late elliptico-subfusiformes, 11.5-14-(15.5) X 4.8-6 µm, leves.

Paxillus aurantiacus belongs in sect. Defibulati and is closely related to P. squarrosus. It differs in the yellow pileus, structure of the cuticle, white unchanging context, presence of sterile structures in the hymenium, and the finely velutinate to subglabrous stipe. The unchanging context, repeatedly dichotomously branched lamellae, and differences in chemical characters distinguish it from the South American P. statuum.

Singer (1962) indicated that if the Australian species P. muelleri (Berk.) Sacc. lacked clamp connections, it also should be included in sect. Defibulati. Subsequent examination of authentic material by Pegler (1965) showed that clamp connections were absent in this species, and the section now contains four species endemic to the South Temperate Zone.

Typus: Canterbury Province, near Cass, 31.iii.l968, M. J. Noonan, PDD 26294.

Recently, Bresinsky & Jarosch (Bresinsky et al.1999) created a new bolete genus Austropaxillus to accommodate Southern Hemisphere species of Paxillus, including three New Zealand endemic species described by McNabb (1969). One of McNabb's names, Paxillus aurantiacus, is an illegitimate later homonym; consequently, Bresinsky & Jarosch's binomial Austropaxillus aurantiacus must be treated as a nomen novum dating from 1999 rather than a combinatio nova based on a 1969 basionym (Greuter et al. 2000, Article 58). Thus, the nomen novum Paxillus macnabbii previously published by Singer et al. (1990) has priority, and it is here recombined in Austropaxillus.

Austropaxillus macnabbii (Singer, J.García & L.D.Gómez) Pennycook, comb. nov.ç Paxillus aurantiacus McNabb, N.Z. J. Bot. 7, 357 (1969), nom. illegit., non Ellis 1882. ç Paxillus macnabbii Singer, J.García & L.D.Gómez, Beih. Nova Hedwigia 98, 4 (1990), nom. nov., as "mcnabbii".ç Austropaxillus aurantiacus Bresinsky & Jarosch, in Bresinsky et al., Plant Biology 1, 332 (1999), nom. nov. superfl., as "comb. nov."

NOTES: Index of Fungi 6: 442, 1994, is mistaken in attributing the misspelt epithet "auranticus" to McNabb (1969); the origin of this misspelling is a typographic error in Index of Fungi 3: 561, 1970.

*See Horak (1979, 1983) and McNabb (1969). His P. aurantiacus is a homonym (Paxillus aurantiacus Ellis) and should be known as P. mcnabbii nom. nov. (= P. aurantiacus McNabb, N. Zeal. Journ. Bot. 7: 357. 1969, non Ellis).

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Austropaxillus mcnabbii (Singer, J. García & L.D. Gómez) Jarosch 2001
Austropaxillus macnabbii (Singer, J. García & L.D. Gómez) Jarosch 2001
Austropaxillus mcnabbii (Singer, J. García & L.D. Gómez) Jarosch 2001
Austropaxillus macnabbii (Singer, J. García & L.D. Gómez) Jarosch (2001)
Austropaxillus mcnabbii (Singer, J. García & L.D. Gómez) Jarosch 2001
Austropaxillus macnabbii (Singer, J. García & L.D. Gómez) Jarosch (2001)
Austropaxillus macnabbii (Singer, J. García & L.D. Gómez) Pennycook (2003)
Austropaxillus mcnabbii (Singer, J. García & L.D. Gómez) Jarosch 2001
Austropaxillus macnabbii (Singer, J. García & L.D. Gómez) Jarosch (2001)
Austropaxillus mcnabbii (Singer, J. García & L.D. Gómez) Jarosch 2001
Austropaxillus macnabbii (Singer, J. García & L.D. Gómez) Jarosch (2001)
Austropaxillus mcnabbii (Singer, J. García & L.D. Gómez) Jarosch 2001
Austropaxillus macnabbii (Singer, J. García & L.D. Gómez) Jarosch (2001)
Austropaxillus mcnabbii (Singer, J. García & L.D. Gómez) Jarosch 2001
Austropaxillus macnabbii (Singer, J. García & L.D. Gómez) Jarosch (2001)
Austropaxillus mcnabbii (Singer, J. García & L.D. Gómez) Jarosch 2001
Austropaxillus mcnabbii (Singer, J. García & L.D. Gómez) Jarosch
Paxillus aurantiacus McNabb 1969
Paxillus aurantiacus McNabb (1969)
Austropaxillus mcnabbii (Singer, J. García & L.D. Gómez) Jarosch 2001
Paxillus macnabbii Singer, J. García & L.D. Gómez (1990)
Austropaxillus mcnabbii (Singer, J. García & L.D. Gómez) Jarosch 2001
Paxillus macnabbii Singer, J. García & L.D. Gómez (1990)

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b4d01f73-bac6-414a-9f6f-59943311fee9
scientific name
Names_Fungi
13 November 2003
30 April 2012
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