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Page number:244 
Description type:Non-original description 
Description:Vanderbylia fraxinea (Fr.) Reid Figure 32 Perenniporia fraxinea (Fr.) Ryvarden (1978). - Poria fraxinea (Fr.) Ginns (1984).
The following are notes from collections which I made in Cambridge, England, in 1933 and identified as Fomes fraxineus by E.M. Wakefield. Fruit-bodies were found both on Fraxinus and Ulmus.
Pores 180-240 µm wide, subcircular, dissepiments 40-110 pin thick. Spores 6-7.7 x 5-7 µm, subglobose, or pip-shaped 7-8 x 5.5-6 µm, white, smooth, with slightly thickened wall -0.5 µm, not truncate, strongly red-brown dextrinoid. Cystidia and hyphal pegs none. Hyphae dimitic in the flesh, subtrimitic in the dissepiments, not encrusted, not agglutinated, strongly reddish brown dextrinoid; skeletal hyphae 4-6 µm wide in the flesh, with nearly colourless walls -2 µm thick, swelling -12 µm in potash and with linear lumen, rarely branched, aseptate, unlimited, very abundant; generative hyphae 2-4 µm wide, clamped, thin-walled; dissepiments with dextrinoid skeletals 35 µm wide, walls -2 µm thick, descending and interwoven, not agglutinated, the ends often with 1-3 branches developing into short binding hyphae also dextrinoid 1-2.5 µm wide, more or less lining the tubes and projecting into the hymenium, the skeletal hyphal ends occasionally swollen, -10 µm wide where branched. Surface of pileus with a slight tomentum 100-200 µm thick composed of loose hyphal ends, developing at the base of the tomentum a thin agglutinated dark brown crust -120 µm thick, also with some branching of the ends of the skeletals in the region of the crust.
This species produces binding hyphae from the ends of the skeletals as does V. borneensis, but apparently only in the dissepiments.
 
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