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Suillus subacerbus McNabb 1968

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Suillus subacerbus McNabb, New Zealand J. Bot. 6 166 (1968)

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McNabb
McNabb
1968
166
ICN
Suillus subacerbus McNabb 1968
NZ holotype
species
Suillus subacerbus

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subacerbus

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Suillus subacerbus McNabb 1968

Type: Mycorrhizal Fungi; Description: Basidiomata pileate. Pileus variable in colour, creamy yellow to olive grey when young, becoming yellow, cinnamon brown or reddish orange later, often streaked with a mixture of these colours, 70–140 mm in diameter, plano-convex to applanate, mucilaginous; flesh white to pale yellow. Pore surface adnate to subdecurrent; tubes dull yellow becoming darker, up to 12 mm long; pores concolorous with tubes, angular, 0.7–1 mm in diameter. Stipe more or less cylindrical, white at first but becoming creamy yellow, with conspicuous greyish to pinkish brown glandulae, annulus absent, 50–80 mm long. Basidiospores elliptical, 0-septate, 8–10 × 3–4 μm, smooth, pale yellow.
Distribution: Auckland.; 1st Record: McNabb (1968).
Significance: Not known.; Host(s): Pinus radiata.

Suillus subacerbus McNabb 1968

COLLECTIONS EXAMINED: Under P. radiata, Auckland, Woodhill State Forest, 23 May 1966, G. 1. Jane, (HOLOTYPE, PDD 25207); May 1966, G.T.J., 25208-9.
PILEUS: plano-convex to applanate, 7-14 cm diam., mucilaginous, glabrous, extremely variable in colour, often pallid creamy yellow to olive grey when young, becoming yellow ochre, yellow, cinnamon brown, cocoa brown or reddish orange at maturity, more often irregularly streaked or patched with a mixture of several of these colours, occasionally entirely greyish; cuticle an ixotrichodermium, to 300 µm. thick, readily separable, composed of more or less erect, interwoven, hyaline hyphae 2.5-3.5 µm diam., heavily gelatinised and crystal-encrusted, hypodermium well differentiated, both cuticle and hypodermium staining vinaceous with KOH; margin entire, often undulate, extending beyond pores, inrolled, sterile. HYMENOPHORE: tubes to 12mm long, adnate to sub-decurrent, dull yellow when young, becoming darker at maturity; pores concolorous with tubes, angular, 0.75-1 mm diam., unchanging where damaged, beaded with droplets of cloudy, white liquid when young. STIPE: 5-8-(11) cm long, more or less equal, or slightly expanded basally, 2-2.5 cm diam., solid, often faintly reticulate apically, white at first, becoming pallid creamy white to creamy yellow, glandulae irregular in size and shape, often large and conspicuous, greyish to pinkish when young, pinkish brown at maturity; flesh white, staining bright yellow when exposed to air; annulus absent.

SPORES: spore print yellowish brown (between Cinnamon and Clay Color); spores pallid melleous, elliptic-subfusiform to oblong-elliptical, 7.8-9.1-(9.8) X 3.0-3.6-(3.9) µm, smooth. HYMENIUM: basidia hyaline, clavate, 21-30 X 5-7.5 µm., 4-spored; cystidia crowded in groups at or near tube mouths, no solitary cystidia seen, thin-walled, subclavate to clavate, 35-70 X 5.5-8.5 µm., vinaceous in KOH. HYMENOPHORAL TRAMA: bilateral of the Boletus subtype; clamp connections absent. CONTEXT OF PILEUS: white to pallid yellow, usually with large brownish areas, unchanging on exposure to air. TASTE: mild. SMELL: not distinctive. CHEMICAL REACTIONS: KOH on pileus—dark brown with vinaceous tints; on context of pileus—immediate, red flush turning mauve; NH4OH on pileus—dark reddish brown; on 'context— faint red to mauve.

HABITAT: Gregarious or caespitose under Pinus.
Pileus plano-convexus ad applanatum, 7-14 cm diam., mucilaginosus, glaber, colore valde vario, subinde cremeo-flavus ad olivaceo-griseum ubi juvenilis, ochraceus, flavus, cinnamomeus, cacainus vel cinnabarinus ubi maturus, saepe nonullis ex bis coloribus maculatus striatusque, subinde omnino griseus. Tubi adnati ad subdecurrentes, flavi; pori concolores, angulares, 0,75-1 mm diam., liquorem album sudantes ubi juveniles. Stipes 5-8-(11) cm longus, plus minusve aequalis, 2-2.5 cm diam., subcremeo-albus ad cremeo-flavum; glandulae adsunt. Sporarum massa fulva; sporae elliptico-subfusiformes ad oblongo-ellipticas, 7.8-9.l- (9.8) X 3-3.6-(3.9) µm, leves. Typus Auckland Province, Woodhill State Forest, 23 May 1966, G. T. Jane, PDD 25207.

Suillus subacerbus is probably of North American origin. In New Zealand it has been found only in association with Pinus radiata.

Suillus subacerbus appears to belong to the S. granulatus - S. pungens -S. acerbus complex of species as described by Smith and Thiers (1964) in their extensive study of North American Suilli. Of these species, S. subacerbus is most closely related to S. pungens Thiers & A. H. Smith and S. acerbus A. H. Smith & Thiers, both of which are recently described species naturally associated with Pinus radiata in California. However, it differs from both these species in a number of characters. In pileus colour, Suillus subacerbus most closely resembles S. pungens, but differs in the absence of a marginal roll of white tissue when young, shorter spores, vinaceous colour produced by KOH on cuticle and cystidia, and absence of a harsh taste and strong pungent smell. It is perhaps more closely related to S. acerbus, from which it may be separated by the combination of colours in the pileus, smaller spores, constant vinaceous colour produced by KOH on cuticle and cystidia, and absence of an unpleasant taste. Although these may appear to be but minor differences, the distinctions between many species of Suillus are not great, and S. subacerbus cannot satisfactorily be accommodated within any of the species so far described.

S. subacerbus may be distinguished from other Suilli occurring in New Zealand by the combination of colours in the pileus, presence of glandulae, absence of an annulus, and vinaceous colour reaction to KOH.

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Suillus subacerbus McNabb 1968
Suillus subacerbus McNabb 1968
Suillus subacerbus McNabb 1968
Suillus subacerbus McNabb (1968)
Suillus subacerbus McNabb 1968
Suillus subacerbus McNabb (1968)
Suillus subacerbus McNabb 1968
Suillus subacerbus McNabb (1968)
Suillus subacerbus McNabb 1968
Suillus subacerbus McNabb (1968)
Suillus subacerbus McNabb 1968

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Suillus subacerbus McNabb 1968
New Zealand
Auckland
Suillus subacerbus McNabb 1968
New Zealand
Dunedin
Suillus subacerbus McNabb 1968
New Zealand
Nelson
Suillus subacerbus McNabb 1968
New Zealand
North Canterbury
Suillus subacerbus McNabb 1968
New Zealand
Wairarapa

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taxonomic status
Sequences and morphology indicate S. subacerbus is a synonym of S. pungens [JAC]

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1cb1a657-36b9-11d5-9548-00d0592d548c
scientific name
Names_Fungi
1 March 2000
7 May 2015
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