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 Add this item to the list   Hydnellum concrescens (Persoon) Banker.
   
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Page number:36 
Remarks (internal):Associated tree species are listed in Table 3. Tsuga canadensis was the only tree species that was consistently found with collections of H. concrescens, and usually was accompanied by rhododendron.
Fries (1821) recognized H. concrescens in his work, but at infraspecifie ranking, with the incomplete name H. cyathiforme b.
This species is very similar to H. scrobiculatum, having highly concrescent basidiocarps, but H. concrescens differs in that it is usually obviously zonate, and has smooth pilei (refer to the descriptions in this chapter) In the literature (Fries, 1821; Banker, 1906; Coker and Beers, 1951), the presence or absence of the zones on the pileus of H. concrescens has been accepted as easily separating the two species. A range or gradient of forms bet ween the two make them appear to be almost identical, however. The only positive means of separation of the two species is comparison of the types of tubercules formed on the spores (Maas Geesteranus, 1971). The tubercules of H. concrescens are flattened to exsculpate, but always prominent, whereas the tubercules of H. scrobiculatum are rounded or flattened, and are not prominent.
Maas Geesteranus (1975) placed the species Hydnellum subsuccosum in synonymy with H. concrescens. I have examined the type specimens of both species (Baird, 1986) and can report that their micromorphological characters are almost identical. The sizes and forms of the basidiocarps are so different, however, that the two seem distinct. Until I am able to observe fresh material of H. subsuccosum, a western species, it will be excluded from the synonymy list under H. concrescens, Batsch (1789) did not designate a type specimen of H. zonatum, but the original description and an accompanying plate clearly indicate that the species is conspecific with H. concrescens.
 
Description type:- 
Description:Hydnellum concrescens (Persoon) Banker.
Sporophore single but usually concrescent. Pileus up to 9.5 cm broad (fused), plane to depressed, irregular, often lobed, tomentose becoming matted or glabrous, often radially rugulose to rugose, often pitted or asperate at the disc, white (6A1), reddish white (8A2), pale orange (6A3) to dark brown (7E5), ("White", "Pale Cinnamon Pink", "Pale Flesh" to "Walnut Brown@), bruising black; yellowish spots of excrement present on dried material; concentric corrugations or zones present; context up to 4.0 :m thick, not duplex, zonate, brownish orange (7C6) to fawn (8E4) ("Onion Skin Pink" to "Burnt Umber"). Stipe up to 3.0 x 1.0 cm, usually central, attenuate above with a bulbous base, velutinous to spongy tomentose at base, matted or glabrous above, grayish brown (10D3) to madeira (8E5) or reddish brown (9E5) ("Light Brownish Drab" to "Chestnut Brown" or "Chocolate Brown"), bruising black; context duplex, zonate, concolorous with pileus flesh. Spines up to 2.0 :m long, decurrent, crowded, white (9A1) to reddish brown (9E5) or violet brown (1OE4) ("White" to "Chocolate Brown" or "Dark Vinaceous Brown"). Chemical reactions:
context tissue blue green in KOH or NH4OH. Pileus trama hyphae up to 5.0 9m diam, uninflated, interwoven in subsurface layer, parallel below, unclamped; gloeoplerous- like hyphae up to 6.3 :m diam. Stipe hyphae up to 6.3 :m diam, uninflated, interwoven in subsurface layer, parallel at the centre, unclamped; gloeoplerous-like hyphae up to 6.3 pro diam, Spine trama hyphae up to 5.0 :m diam, uninflated, unclamped. Basidia 17.0-37.5 x 6 4.0-7.0 :m (X= 24.58±5,00 x 5.65±0.91. :m), clavate, unclamped, 4spored; sterigmata (3.0) 3.5-5.0 (6.0) :m long (X= 4.05±0.69 :m). Basidiospores (4.0) 5.0-6.0 (7.0) }:m (X= 5.24±0.54 x 4.41±0.50 :m), subglobose, brownish; ornamentation tuberculate, prominent, flattened to exsculpate; hilar appendage oblique.
Terphenylquinones: Thelephoric acid.
Distribution: occurs in Europe (Maas Geesteranus, 1975) and North America (Coker and Beers, 1951; Harrison, 1968); specimens examined: Alabama, Georgia, North Carolina, Tennessee, Virginia.
 
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