Illustrations: WD 1035.
Fibuloporia vaillantii (Fries) Bondarsev & Singer
Description:
Fruit-body: a resupinate layer of pores with cream-coloured or white sterile radiating margin.
Spore-bearing tissue: distributed within a series of small often shallow, white or ivory tubes.
Spore-print: white.
Spores: smooth, hyaline under the microscope, oblong 5-7 × 3-4 µm.
Cystidia: absent.
Habitat & Distribution: The dry-rot of houses, particularly in roof-systems.
General Information: Fibuloporia vaillantii is recognised by the white, resupinate pore-surface and fairly tough nature due to the presence of strengthening hyphae. Just as the genus Polyporus was found to be composed of several quite different elements (see [pp. 140-44]) and has since been split up into a number of different genera, the genus Poria has also been fragmented; one of the constituent genera is Fibuloporia. Amyloporia xantha (Fries) Bondarsev & Singer differs in having amyloid tissue and cystidia encrusted with crystals. The flesh contains both simple hyphae and thickened structural hyphae. It is yet another member of the large old unwieldy genus Poria and causes decay of worked wood, particularly the timbers of benching and staging in greenhouses. A. xantha has a sulphur-yellow pore-surface and is rather cheesy when handled.