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Page number:388 
Description type:Culture description 
Description:Poria ferruginosa (Schrad. ex Fries) Karst.
Cultural characters: (Pl. XV, Fig. 6; PI. XVI, F1gS. 16 to 18).
Growth characters. Growth very slow, radius 4.0-7.0 cm. in six weeks. Advancing zone with shallow bays, the aerial mycelium uniform to limit of growth. Mat white at first and remaining so over most of surface or only in narrow zone, changing to "honey yellow" (2.0Y6.7/6.2), "sayal brown" (7.0YR5.0/5.5), "Saccardo's umber" (9.0YR3.8/3.5), with flecks of "ochraceous-tawny" (6.0YR4.9/6.3) (one to six weeks) over most of surface or in restricted zone around inoculum, appressed downy to thin felty, occasionally with slightly more compact growth in fan-shaped areas. Reverse unchanged below white parts of mat, "ochraceous-tawny" (6.0YR4.9/6.3) to "buckthorn brown" (8.0YR4.8/6.5) below colored areas. No odor. On gallic and tannic acid agars diffusion zones moderately strong to strong, trace of growth to colony 1.0 cm. diameter on both media.
Hyphal characters. Advancing zone: hyphae hyaline, with simpte septa, 2.2-4.5 µm diameter. Aerial mycelium: (a) hyphae as in advancing zone, hyaline to dilute brown, frequently branched and anastomosed; (b) setae or setal hyphae numerous, thick-walled, dark brown, pointed, elongate, 90.0-200.0 x 4.5-6.0 µm, frequently the end of a dark brown hypha. Submerged mycelium: hyphae as in advancing zone.
Type of rot: white rot of broad-leaved and, rarely, coniferous trees.
The elongate setae or setal hyphae of Poria ferruginosa are distinct from the short setae of Fomes Pini and Polyporus circinatus, and also from the broader setal hyphae of Polyporus glomeratus, cultures of which, in addition, exhibit a pseudoparenchymatous layer not found in Poria ferruginosa. It is possible, therefore, to separate P. ferruginosa from these other species having identical key patterns.
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