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Boletus immutatusPhoto: Alan HillsBack to the BAP list |
DescriptionGeneral: Medium or large fruit body with dark brown, bay or chestnut cap; deep red pores, robust red stem, no parts blueing; solitary or scattered in parkland with beech, more rarely with oak.Dimensions: Cap 2-20cm dia; stem 8-14cm tall x 2-5cm dia. Cap: Dark brown, bay to chestnut with reddish tinges, not bruising darker; at first hemispherical then convex, velvety-tomentose becoming smooth with age. Flesh yellow, firm, unchanging Pores: Deep reddish-scarlet. Tubes sulphur yellow to egg yellow, minute, roundedly angular. Stem: Deep reddish-carmine, not blueing, speckled with dark red granules at the base, strongly ventricose; flesh may slowly discolour reddish-purple at the base. |
Spores: Brown, cylindrical-fusiform, with prominent droplets, 12-15 x 4.5-6.0 µm. Basidia 4 spored; cystidia sparse, fusiform or lageniform. Odour: Not distinctive. Taste: Not distinctive. Edible. Chemical Tests: Rapidly blue-grey with ferrous sulphate. Occurrence: Summer to very early Autumn. |
| Qualifying criterion: 4.6: very rare and recently elevated to species rank |
| Justification: probably endemic to the UK; only confirmed from one site where it is severely threatened by inappropriate management |
| Threats: felling of host trees, trampling, compaction, forestry operations; track maintenance; mechanical bracken control |
| Action Required: site protection, liaison with land managers and monitoring against habitat loss and degradation |
Statistics:UK (excluding NI & CI) fungus records |
Total records: 33 |
| Earliest recording: 1994 | |
| Latest recording: 2001 | |
| Vice Counties and (frequency): 22(33) | |
| Pre-1960: 0 records | |
| NBN Gateway grid map | Post-1960: 33 records |