Name: Oxyporus populinus (Schumach.) Donk
Most Confident Observations:
Copyright © 2009 Andreas Gminder (mollisia)
Copyright © 2009 Andreas Gminder (mollisia)
Copyright © 2012 Patrick Harvey (pg_harvey)
Copyright © 2015 Patrick Harvey (pg_harvey)
Version: 4
Previous Version 

First person to use this name on MO: Nathan Wilson
Editors: Jason Hollinger, Erlon Bailey


Rank: Species

Status: Deprecated

Name: Oxyporus populinus

ICN Identifier: missing

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Author: (Schumach.) Donk

Citation: Mededelingen van het botanisch Museum en Herbarium van de Rijksuniversiteit Utrecht 9: 204 (1933) [MB#275074]

Preferred Synonyms:Rigidoporus populinus (Schumach.) Pouzar

Deprecated Synonyms: Boletus populinus Schumach., Polyporus populinus (Schumach.) Fr., Trametes populina (Schumach.) Fr., Fomes populinus (Schumach.) Cooke, Scindalma populinum (Schumach.) Kuntze, Rigidoporus populinus (Schumach.) Teixeira, Polyporus connatus Weinm., Trametes secretanii G.H. Otth, Polyporus cremeus Bres. ex Lloyd


Domain: Eukarya

Kingdom: Fungi

Phylum: Basidiomycota

Class: Agaricomycetes

Order: Hymenochaetales

Family: Meripilaceae

Genus: Rigidoporus

Species: Rigidoporus populinus
  (= Oxyporus populinus)

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Notes on Taxonomy: [Edit]

Sanctioning name :
Polyporus populinus (Schumach.) Fr., Systema Mycologicum 1: 367 (1821) [MB#213571]

Basionym :
Boletus populinus Schumach., Enumeratio Plantarum, in Partibus Sællandiae Septentrionalis et Orientalis Crescentium 2: 384 (1803) [MB#449634]

Specimen record #96293
Collected by : G.S. de Hoog
Collection date : oct 1968
Country (state) :

Location details : Kennemerduinen, Bloemendaal
Host : Populus

Brief Description: [See More | Edit]

Literature :
Ryvarden, L.; Gilbertson, R.L. 1994. European polypores. Part 2. Synopsis Fungorum. 7:394-743

Page number : 446
Remarks (public) : Oxyporus populinus is well differentiated from the other species in the genus by its perennial, sessile basidiocarp with the tube layers separated by thin layers of context. In the northern part of Fennoscandia this species often occurs as resupinate annual basidiocarps. In such cases the larger subglobose spores will separate it from the more southern O. obducens. Macroscopically such resupinate basidiocarps are identical.

Description type : Non-original description
Description : Oxyporus populinus (Schumach.:Fr.) Donk – Med. Bot. Mus. Univ. Utrecht 9:204, 1933. – Polyporus populinus Schumach.:Fr., Syst. Mycol. 1:367, 1821. – Boletus populinus Schumach., Enum. Pl. Saell. II, p. 384, 1803.

Basidiocarps perennial to annual, sessile, effused-reflexed to strictly resupinate; pilei often imbricate and laterally fused, up to 5 × 12 × 5 cm; upper surface cream colored to buff or darkening with age, finely tomentose to glabrous, often covered with mosses at the base; pore surface cream colored to buff, the pores circular to angular, 5-7 per mm; context cream coloured to tawny, corky, faintly zonate to azonate, up to 2 cm thick; tube layers concolorous, distinctly stratified in perennial basidiocarps, separated by a thin layer of context tissue, up to 5 cm deep.

Hyphal system monomitic; contextual hyphae simple-septate, hyaline, thin- to thick-walled, 2.5-4.5 µm in diam; tramal hyphae similar, mostly thin-walled. Cystidia abundant, thin-walled, cylindric to capitate, 20-35 × 3-4.5 µm, capitately to entirely encrusted, incrustation dissolving rapidly in KOH, encrusted portion 6-12 µm in diam.

Basidia ovoid to broadly clavate, 4-sterigmate, 8-14 × 5-5.5 µm, simple- septate at the base.

Basidiospores subglobose, hyaline, smooth, negative in Melzer’s reagent, 3.5-4.5 × 2.5-4 µm.

Type of rot. White heartrot of living hardwood trees; often fruiting in stem depressions or cracks.

Cultural characteristics. See Campbell, 1937; Nobles, 1948, 1958, and 1965; Stalpers, 1978.

Sexuality. Unknown.

Substrata. On dead and living hardwoods, especially Acer, but also collected on Aesculus, Alnus, Betula, Castanea, Corpus, Corylus, Cratageus, Eucalyptus, Fagus, Fraxinus, Juglans, Malus, Platanus, Populus, Robinia, Quercus, Salix, Sambucus, Tilia and Ulmus.

Distribution. Throughout Europe to 70°N in Finnmark, Norway. Circumglobal species.

Literature :
Corner, E.J.H. 1987. Ad Polyporaceas IV. Beihefte zur Nova Hedwigia. 86:1-265

Page number : 134
Description type : Non-original description
Description : Oxyporus populinus (Fr.) Donk
Ryvarden (1978) 296; Ryvarden and Johansen (1980) 458; Sultan Ahmad (1972) 114.
I give the following notes on a collection made by me in Hokkaido, Japan, September 1966.

Pileus -25 mm in radius, subungulate, descending, subvillous to matt, sulcato-zoned, white. Tubes in 6-7 layers, each 0.5-1.5 mm thick, separated by a thin layer of flesh; pores 100-125 µm wide, round, dissepiments 40-80 µm thick; no hyphal pegs. Flesh 5-6 mm thick at the base of the pileus, toughly felted, without a crust.

Spores 4-4.5 × 3.5-4 µm, white, smooth, subglobose, with slightly thickened wall, 1-guttate, not amyloid-dextrinoid. Basidia 11-14 × 67 µm; sterigmata 4. Cystidia as the out-turned ends of rather thickwalled tramal hyphae 3 µm wide, clavate to subventricose 5-7 µm wide, thick-walled, encrusted, scarcely projecting, the tramal stalk – 100 µm long (? more), developing at the downgrowing ends of the dissepiments, not gloeocystidial; hymenial cystidia none. Hyphae monomitic to subdimitic (dl), without clamps, 2-4 µm wide, walls -1 µm thick, the cells 30-200 µm long (? more), the branches often constricted on origin, the wider hyphae more or less radial and less branched with thicker walls, not dextrinoid; dissepiments with strictly descending hyphae 1-3.5 µm wide, the wider hyphae with walls -0.5 µm thick and many ending in cystidia. Surface of pileus consisting of much interwoven hyphae 2-4 µm wide with the ends irregularly excrescent -100 µm, not as a regular pile.

Literature :
Ryvarden, L.; Johansen, I. 1980. A preliminary polypore flora of East Africa. :1-636

Page number : 458
Description type : Non-original description
Description : OXYPORUS POPULINUS (Fr.) Donk.
Med. Bot. Mus. Univ. Utrecht 9:204, 1933. – Polyporus populinus Fr. Syst. Mycol. 1:367, 1821.

FRUITBODY annual to perennial, solitary or imbricate, resupinate or pileate, sessile, 3-10 cm wide, up to 4 cm thick depending on age and the number of pore layers. Consistency corky. PILEUS surface whitish, pallid ochraceous, cream or clay-coloured (even becoming glabrous) cortex missing. Margin first acute, thickening with age. PORE LAYER ochre, pale ferruginous to bay with a margin boarder up to 6 mm broad, shiny, pores round to somewhat angular, 4-7 per mm, dissepiments thin and papery, entire or toothed, tubes whitish, later straw-coloured to bay, often stratified, each layer 2-4 mm thick, separated by thin whitish fibrous context layers.

CONTEXT 2-6 mm thick, cream to ochre, somewhat fibrous of compact radiately arranged hyphae.

HYPHAL SYSTEM monomitic, generative hyphae in the dissepiments hyaline to yellow, thin to thick-walled, without clamps, 2.5-4 µm wide, hairs on surface or pileus hyaline, 15-25 µm long, contex hyphae yellowish 2.5-4.5 µm wide. CYSTIDIA numerous, thin to thick-walled, hyaline to yellowish, coarsely apically encrusted, 10-15 × 4-5 µm. SPORES broadly ellipsoid to subglobose, hyaline, thin-walled or distinctly thickened, smooth, 3.5-4.5 × 3-4 µm, nonamyloid.

HABITAT. On deciduous trees. DISTRIBUTION. Europe, North America, Australia, in Africa found in Kenya.

REMARKS. The subglobose spores, thee numerous cystidia and the usually stratified tube layers separated by a thin context layer and the small pores are characteristics for the species.

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