Checklist of the British & Irish Basidiomycota

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Postia caesia (Schrad.) P. Karst., Revue mycol. Toulouse 3(no. 9): 19 (1881)

Boletus caesius Schrad., Spicil. Fl. Germ. 1: 167 (1794)
Polyporus caesius (Schrad.) Fr., Syst. mycol. (Lundae) 1: 360 (1821)
Leptoporus caesius (Schrad.) Quél., Enchir. fung. (Paris): 176 (1886)
Tyromyces caesius (Schrad.) Murrill, N. Amer. Fl. Ser. 2 (New York) 9(1): 34 (1907)
Oligoporus caesius (Schrad.) Gilb. & Ryvarden, Mycotaxon 22(2): 365 (1985)

Habitat: On dead or decayed wood of conifers. Usually on Pinus sylvestris but also known on Larix and Picea spp. Reported on deciduous hosts but unsubstantiated with voucher material. Rarely on worked wood (decayed planks or fence posts) in outdoor habitat.

Notes: Occasional but widespread. Confused with Postia subcaesia but less frequent than that species.

Distribution: E: o, S: o, W: o, NI: o, ROI: o, Other: Channel Islands: !; Isle of Man: !

Vouchers: England: K(M) 41180; Scotland: K(M) 73918; Wales: K(M) 73908; NI: K(M) 73895; ROI: K(M) 73930 (very old record); Other: Channel Islands: K(M) 73890

Descriptions, Lists & Icons:
D+I:, in Phillips, R., Mushrooms and other fungi of Great Britain & Europe: 288 pp. (1981), as Tyromyces caesius, p. 232-233
D+I:, in Breitenbach, J., Kränzlin, F., Fungi of Switzerland Non gilled fungi, Heterobasidiomycetes, Aphyllophorales, Gasteromycetes 2: 412 pp. (1986), p. 272, pl. 334
D:, in Hansen, I. & Knudsen, H., Nordic Macromycetes Heterobasidioid, Aphyllophoroid and Gasteromycetoid Basidiomycetes, (Ed.: Lise Hansen & Henning Knudsen) 3: 444 pp. (1997), p. 234
D:, in Ryvarden, L & Gilbertson, R.L., European Polypores: Meripilus - Tyromyces, (Ed.: Ryvarden L. & Gilbertson R.L) 2: 388-743 (1994), as Oligoporus caesius, p. 404

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