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Xerocomus mcrobbii McNabb 1968

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Xerocomus mcrobbii McNabb, New Zealand J. Bot. 6 147 (1968)

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McNabb
McNabb
1968
147
ICN
Xerocomus mcrobbii McNabb 1968
NZ holotype
species
Xerocomus mcrobbii
[New Zealand], Maruia, Jackson's Creek, 23 Mar 1966, R.F.R. McN., (HOLOTYPE. PDD 25242);

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mcrobbii

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Xerocomus mcrobbii McNabb 1968

COLLECTIONS EXAMINED: Under (1) N. fusca and N. menziesii, Nelson, Maruia, Mar 1966, J. A. McRobb, 25241; Maruia, Jackson's Creek, 23 Mar 1966, R.F.R. McN., (HOLOTYPE, PDD 25242); (2) N. menziesii. Otago, Tapanui, Black Gully, Mar 1966, R.F.R. McN., 25243.
PILEUS: convex, 2-4.5 cm diam., dry, finely felted to subtomentose when young, becoming coarsely fibrillose-scaly at maturity, olive at first, cuticle rupturing at maturity to form adpressed scales and exposing the yellowish brown or reddish context beneath; cuticle a disorganised cutis; scales composed of septate hyphae 4-7 µm. diam., with brownish contents; margin entire to slightly crenulate-lacerate. extending beyond pores. HYMENOPHORE: tubes 6-10 mm long. deeply excavated around apex of stipe, yellow; pores dark red, concolorous with apex of stipe, angular, 0.5-(l) mm diam. STIPE: 3.5-5.5 cm long. more or less equal, 0.5-1 cm diam., solid, dry, with adpressed squamules often arranged in irregular rings around stipe, dark red apically, yellow basally; flesh and basal mycelium bright yellow, annulus absent. SPORES: spore print not obtained; spores deep melleous, broadly elliptical to elliptic-subfusiform, occasionally obovate. 9.7-14.3 X 4.5-7.2 µm, smooth. HYMENIUM: basidia hyaline, clavate, 32-49 X 9.8-14 µm, 4-spored; cystidia sparse, scattered, hyaline, thin-walled, subcylindrical to narrowly ventricose-rostrate, 45-63x4-7 µm. HYMENOPHORAL TRAMA: bilateral, of the Phylloporus subtype; clamp connections absent. CONTEXT OF PILEUS: bright yellow, unchanging on exposure to air. TASTE AND SMELL: not distinctive.
HABITAT: Gregarious or occasionally caespitose under Nothofagus.
Pileus convexus, 2-4.5 cm diam., siccus, subtiliter coactus ad subtomentosum ubi juvenilis, crasse fibrilloso-squamosus ubi maturus, olivaceus ubi juvenilis, subfulvus vel rubeus cum squamis olivaceis ubi maturus. Tubi alte excavati, flavi; pori rubidi, angulares, 0.5-(l) mm diam. Stipes 3.5-5.5 cm longus, plus minusve aequalis, 0.5-1 cm diam., squamulosus, ad apicem rubidi, ad basim flavi. Sporae late ellipticae ad elliptico-subfusiformes, subinde obovatae, 9.7-14.3 X 4.5-7.2 µm, leves. Typus Nelson Province, Maruia, Jackson's Creek, 23 Mar 1966, R.F.R. McN., PDD 25242.

Xerocomus mcrobbii has the general appearance of a Boletellus, but may be distinguished from members of that genus by the short smooth spores and hymenophoral trama of the Phylloporus subtype. Although the ammonia reaction of fresh pilei is not known, the short spores (Q=2) indicate that Xerocomus mcrobbii most probably belongs in sect. Pseudogyrodontes. The fact that it has been found only under Nothofagus in two widely separated localities suggests that it is a mycorrhizal species.

Xerocomus mcrobbii may be recognised by the olive pileus, which becomes fibrillose-scaly at maturity, yellow tubes and deep red pores, and short spores.

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Xerocomus mcrobbii McNabb 1968
Xerocomus macrobbii McNabb 1968
Xerocomus mcrobbii McNabb 1968
Xerocomus macrobbii McNabb (1968)
Xerocomus mcrobbii McNabb 1968
Xerocomus macrobbii McNabb (1968)
Xerocomus mcrobbii McNabb 1968
Xerocomus mcrobbii McNabb
Xerocomus mcrobbii McNabb 1968
Xerocomus mcrobbii McNabb 1968
Xerocomus macrobbii McNabb (1968)
Xerocomus mcrobbii McNabb 1968
Xerocomus macrobbii McNabb (1968)
Xerocomus mcrobbii McNabb 1968

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Xerocomus mcrobbii McNabb 1968
[Not available]

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typification
[New Zealand], Maruia, Jackson's Creek, 23 Mar 1966, R.F.R. McN., (HOLOTYPE. PDD 25242);

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1cb1abcc-36b9-11d5-9548-00d0592d548c
scientific name
Names_Fungi
1 January 2000
20 April 2023
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