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Page number:188 
Remarks (internal):This distinctive fungus is well illustrated in the literature, although good specimens are rare in herbaria, as specimens often turn dark brown or mould during preparation. This species occasionally has a tendency to divide into stout branched forms (Bulliard's Hydnum caput-medusae) that might be mistaken for a stout form of H. coralloides as the spores are the same size. The basic strand-like structure of the hericiums can be seen best in this species in collections that show cavities or gaps in the surface, or when the fruit-body is sectioned. The strands in the tramal tissue radiate, twisting together to form fused bundles within the more or less solid context. The individual strands eventually separate and hang downward to form the long pendent spines. The spore surface of H. erinaceus has been examined using the scanning electron microscope and illustrated (Pegler & Young, 1972). The light microscope shows the surface as ranging from smooth to roughened, while the SEM photographs show variations that are usually small ridges, suggesting that other species might be examined profitably. 
Description type:Non-original description 
Description:3. Hericium erinaceus (Bull. ex Fr.) Pers. Mycol. Europ. 2: 153. 1825. Fig. 6
Hydnum erinaceus Bull. ex Fr. Syst. Mycol. 1: 407. I821. (Based on Hydnum erinaceus Bulliard. Herb. France, pl. 34. 1780.)
Hydnum caput-medusae Bull. ex Fr. Syst. Mycol. 1: 409. 1821.
Dryodon erinaceus (Bull. ex Fr.) Karst. Bidr. Känn. Finl. Nat. Folk. 37: 92. 1882.
Manina cordiformis Scop. Diss. Sci. Nat., Pl. Subterr. pl. 10. 1772.
Manina cordiformis Scop. ex Banker. Mycologia. 4: 277. 1912.
Type represented by Hydnum erinaceus Bulliard. Herb. France, pl. 34. 1780.
Basidiocarp an ovoid to lobed tubercle, solid or lacunose, up to 25 cm wide, attached laterally; upper surface a tangle of coarse agglutinated strands of mycelium; white becoming yellowish and finally brownish. Margin of pileus indefinite, but marked by the bases of long pendent spines. Context fleshy, tough, watery, concolorous; odor and taste mild.
Spines 1-4 cm long, pendent, beard-like, covering the sides. These are formed in a line as though the rows of spines originated in sequence during the enlargement of the tubercle.
Stipe represented by a tough rooting attachment arising within the woody substrate.
No color reaction with chemicals is available from fresh specimens. When KOH was applied to dried material there was no reaction; with Melzer's reagent, context surface and spores were amyloid, context usually amyloid but may not show any darkening in some sections.
Spores 5.5-6.8 x 4.5-5.6 µm, subglobose, finely roughened to smooth; basidia 25-40 x 5-7 µm, 4-spored; gloeocystidia arising in subhymenium, up to 7 µm wide, with dense contents exuding as oily appearing droplets in KOH.
Hyphae of the trama 3-20 µm in diameter, inflated or not, thick-walled, at times the lumen almost closed, interwoven, giving rise to gloeocystidia in the spines. Interweaving hyphae 3-10 µm thick with some clamps, branched and thick-walled.
H. erinaceus is widely distributed but locally rare in North America. Reported from Florida to California in the south, and in the north from Washington, southern Michigan, and New York state. More commonly reported from the southern states than either H. coralloides or H. ramosum. It is considered as being associated with a heart rot of oaks, occasionally on other frondose species, and is usually found growing from knotholes or cracks on living trees. It is recorded on Fagus in a number of states, on Acer spp. (Washington), Eucalyptus (California) and Platanus (Virginia). Only five collections have been made in Michigan, all in southern counties. In Canada, a report by Harrison (1961) is now considered to be the tuberculate form of H. coralloides. No collections have been seen from Ontario and Quebec. Collections have been examined from eleven states.
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