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Literature:
 
Page number:627 
Description type:Non-original description 
Description:Sparassis radicata Weir, Phytopathology 7: 166. 1917.
Basidiocarps annual, arising from a perennial, elongated, underground pseudosclerotium as a rounded mass of many anastomosing and subdivided horizontal and vertical petaloid branches with thin, wavy margins; sometimes growing directly out of wood and lacking a pseudo-sclerotium; becoming quite large, mostly 10-30 cm in diam, 10-20 cm high, creamy yellow to yellowish-brown; odor strong, becoming slightly disagreeable; pseudosclerotium a mass of soil and humus particles held together by white mycelium, up to 70 cm long and 10 cm in diam, attached to roots of living or dead conifers, odor somewhat like smoke-cured bacon.
Hyphal system monomitic; subhymenial hyphae (fig. 3a) compactly arranged and interwoven, thin-walled, 2-8 µm in diam with irregularly inflated portions up to 16 µm in diam. not clearlv differentiated from contextual hyphae, mostly with clamp connections and with some simple septa; contextual hyphae (fig. 3b) similar. slightly larger, 4-8 µm in diam. irregularly swollen and inflated with swollen portions up to 20 µm in diam. mostly with clamp connections and with some simple septa. clamp connections sometimes contorted and difficult to discern; gloeoplerous hyphae (fig. 3c) scattered throughout. aseptate, thin-walled, 6-12 µm in diam, most abundant towards base of basidiocarp; hyphae of the pseudosclerotium compact, of three types; some 2-4 µm in diam. thin-walled, contorted, with clamp connections; some 6-12 µm in diam, thin-walled, mostly aseptate, with some clamp connections; some 12-16 µm in diam. thick-walled. the walls highly refractive and the contents staining deeply in KOH-phloxine, with clamp connections and simple septa.
Hymenial layer distinct, mostly amphigenous, sometimes unilateral depending on position of the branch and age of the basidiocarp: cystidia or other sterile hymenial elements absent: basidia (fig. 3d) closely packed, clavate. 4-sterigmate. 40-60 x 4-8 µm: basidiospores (fig. 3e) ellipsoid, hyaline, smooth, negative in Melzer's reagent. 1-guttulate, 5-7 x 3-5 µm; spore print white.
 
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