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Page number:139 
Remarks (internal):Cooke (1956) treated 10 names as synonyms of P. radiata and I have not attempted to confirm all of these. However, Ginns (1970a) placed P. acerina in synonymy with P. rufa. The type of P. cystidiata is referred to P. radiata because the hymenial cystidia that Cooke thought distinguished it from P. radiata are apparently only an indication of renewed growth of the hymenial elements which results in hymenial thickening. Christiansen (1960) has illustrated these cystidia in P. radiata and I have seen them in a number of collections of typical P. radiata.
The basidiocarps of P. rufa are very similar to those of P. radiata but there are both macroscopic and microscopic differences. Phlebia rufa nearly always has some hymenial folds which anastomose to form pits, whereas the hymenium of P. radiata is never pitted and the folds (or warts) are usually not branched. Phlebia rufa has a relatively thicker basidiocarp which often appears fleshy. Differences in hymenial coloration are an aid in separating the two species, but P. rufa has a rather wide range of colors that frequently seems to overlap those that are foundin P. radiata. Phlebia rufa is typically rufus, deep red, yellow-brown, or pale orange-yellow, whereas P. radiata is generally of pinkish or deep reddish-pink shades. Microscopically the principal feature that is useful in separating P. rufa and P. radiata is spore width. Phlebia radiata has most spores less than 2 µm wide and none greater than 2µm; P. rufa always has spores 2 µm or wider, never less than 2 µm. Hyphal structure of the two species is similar, and the gloeocystidia that they produce appear identical. The abundance of gloeocystidia varies between different portions of the same basidiocarp as well as between basidiocarps.
Description type:Non-original description 
Description:Phlebia radiata Fr., Syst. Mycol. 1 : 427. 1821.
= Phlebia cystidiata Jackson ex W. B. Cooke, Mycologia, 48: 395. 1956.
Basidiocarps effused, separable when fresh, 1 x 2 cm, up to 10 x 10 cm or longer where individuals converge, up to 0.8 mm thick; margin usually concolorous with the hymenium, occasionally a more pronounced orange or pinkish, fimbriate, sometimes granulose, up to 3 mm wide; hymenium usually a reddish-orange or pinkish, occasionally tan to pale orange, rarely darker purplish with a gray bloom, waxy or pruinose, often translucent, the folds narrow, up to 0.5 mm deep, interrupted, rarely branching, often wart-like, not forming pits but radiating, occasionally gyrose-plicate; context white to pallid, cottony, up to 0.3 mm thick.
Hyphal system monomitic; context hyphae in two, sometimes indistinct, layers, the abhymenial layer comprising most of the context in thick specimens and being nearly absent in thin basidiocarps, has the hyphae closely packed and horizontally oriented or rather loosely woven and randomly oriented, hyaline, rather thin- to thick-walled with the walls somewhat gelatinized, with clamp connections, up to 8 µm in diam or occasionally swollen at the septa to 10 µm; the second layer with hyphae often becoming vertically arranged, thin-walled, 2-4 µm. in diam; context and subhymenium often impregnated with amorphous, pale yellow to pale brown granules, usually with large (up to 10 µm. in diam), nearly circular crystals scattered within these tissues; cystidia present in about half the specimens studied, cylindrical or filiform, thin-walled, about 45 x 2(-3) µm. or "60 x 3" (Christiansen 1960), projecting up to 30 µm; gloeocystidia not darkening in sulfuric benzaldehyde reagent, some arising in the subhymenium clavate, 17-40 x 6-12 µm, others arising in the context are cylindrical or clavate, often septate, 30-100 x 6-11 µm (Fig. 18); basidia slenderly clavate, 20-27 x 3.5-5.5 µm; spore wall thin, hyaline, smooth, IKI-, not staining in lactic-blue; spores cylindrical or narrowly oblong, in profile reniform or adaxially flattened, (4-)4.5-5.5 x 1.5-2 µm. (Figs. 21 and 18).
Habitat: Saprophytic on angiosperms and reported (Cooke 1956) on gymnosperms, associated with a white rot. For enumeration of the woody species on which P. radiata occurs and its distribution see Cooke (1956). Generally it is found locally in all states of the U.S.A. and provinces of Canada.
Critical Specimens Examined
Type: Phlebia cystidiata, U.S.A.: California: Humbolt Co.: Trinidad: McNeil's Creek, on bark of Alnus oregana, 7.II.1941, H. E. Parks 6592 (TRTC 158, isotype at DAOM).
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