Search on : Taxa descriptions


 Add this item to the list   HYDNELLUM CONCRESCENS (Pers.) Banker
Page number:175 
Remarks (internal):Hydnellum concrescens is very common throughout the eastern United States and in Florida. The highly concrescent sporophores make this species easy to identify. Only Hydnellum scrobiculatum (Fr.) P. Karst., so far not observed in Florida, can be easily confused with H. concrescens. The spore tubercules of H. scrobiculatum are usually rounded to flattened and almost never exsculpate. The spore tubercules of H. concrescens are almost always flattened to exsculpate. Also, the pileus surface of H. scrobiculatum is never zonate or with concentric corrugations as found with H. concrescens. Some specimens of H. concrescens are often only slightly zonate and are hard to separate from H. scrobiculatum; it is necessary to observe the spore ornamentation for accurate identification.
The list of synonyms for this species is quite extensive. We have observed all of the type specimens for the names included in the list except H. zonatum, but the original description and plate confirm that this species is conspecific with H. concrescens.
Description type:Non-original description 
Description:HYDNELLUM CONCRESCENS (Pers.) Banker
Hydnum concrescens Pers., Obs. Mycol. 1: 74. 1876. Hydnellum concrescens (Pers.) Banker, Mem. Torrey Bot. Club 12: 157. 1906. TYPE: GERMANY. Vogeso-Rhen: Mougeot & Nestler 296
Hydnum zonatum Batsch, Elench. Fung. 109. 1783. Hydnellum zonatum (Batsch) P. Karst., Meddeland. Soc. Fauna Fl. Fenn. 5: 41. 1879. Calodon zonatus (Batsch) P. Karst., Bidr. Kann. Finl. Nat. Folk 37: 108. 1882. Phaeodon zonatus (Batsch) Schroet. in Cohn, Kryptog-fl. Schles. 3(1): 459. 1888. Hydnellum velutinum var. zonatum (Batsch) Maas G., Fungus 27: 64. 1957. Hydnellum scrobiculatum subsp. zonatum (Batsch) Lundell in Lundell and Nannf., Fungi Exs. Suec. Praes. Upsal., Fasc. 53-54: 17. 1959. Hydnellum scrobiculatum var. zonatum (Batsch) K. Harrison, Stip. hydnums Nova Scotia 43. 1961. TYPE: unknown.
Hydnum vespertilio Berk., Hooker's J. Bot. Kew Gard. Misc. 6: 167. 1854. Hydnellum vespertilio (Berk.) Banker, Mycologia 5: 198. 1913. Hydnellum zonatum f. vespertilio (Berk.) Coker & Beers, Stip. hydnums eastern U.S. 80. 1951. TYPE: INDIA. Nunklow, 10 July 1850, M. J. Berkeley s.n. (HOLOTYPE: K!) Hydnum fasciatum Pk., Annual Rep. New York State Mus. 41: 78. 1888. Calodon fasciatus (Pk.) Pat., Essai Tax. Hym?nomyc. 118. 1900. Phellodon fasciatus (Pk.) Banker, Mem. Torrey Bot. Club 12: 171. 1906. Hydnellum fasciatum (Pk.) Coker & Beers. Stip. hydnums eastern U.S. 77. 1951. TYPE: UNITED STATES. NEW YORK: Catskill Mts., Oct, Peck s. n. (HOLOTYPE: NYS!). Hydnellum parvum Banker, Mycologia 4: 200. 1913. TYPE: UNITED STATES. ALABAMA: autumn, Underwood 49 (HOLOTYPE: NY!). Hydnum spathulatum Lloyd, Mycol. Writ. 6: 878. 1919. TYPE: JAVA. C. Bernard (HOLOTYPE: BPI!, Herb. Lloyd 4927).
Sporophore single, more commonly concrescent. Pileus up to 5 cm broad, plane to depressed, margin even to irregularly lobed, tomentose to matted or glabrous, rugulose to rugose, pitted to asperate at disc, white (6A1), reddish white (8A2) to dark brown (7E5); yellowish spots of excrement often present on dried sporophores; zonate or with concentric corrugations; context up to 3.5 mm thick, not duplex, slightly zonate, concolorous with pileus surface. Stipe up to 3.3 x 1.2 cm, central, attenuating upward with a bulbous base, spongy tomentose, matted or glabrous, concolorous; context duplex, zonate, concolorous. Spines up to 2 mm long, decurrent, crowded, reddish white (6A1) to reddish brown (9E5) or violet brown (10E4). Chemical reactions: context tissue blue green in KOH or NH4OH.
Pileus trama hyphae up to 5-5 µm diam, uninflated, interwoven in subsurface layer, parallel below, clamps not seen, gloeoplerous-like hyphae up to 6 µm diam. Stipe hyphae up to 6.5 µm diam, uninflated, interwoven in subsurface layer, parallel below, clamps not seen; gloeoplerous-like hyphae up to 6.5 µm diam. Spine trama hyphae up to 5-5 µm diam, uninflated, clamps not seen. Basidia 2542 x 4-7 µm (.z = 29.32 ± 6-78 x 6.2 ± 0.88 um), clavate, clamps not seen, 4-spored; sterigmata 3-5-5 µm long (z = 4.33 ± 0.52 µm). Basidiospores 5.56.5 x 4-4.8 µm (z = 5.82 ± 0.49 x 4.52 ± 0.61 µm), subglobose, brownish; ornamentation tuberculate (Fig. 1Q, prominent, flattened to exsculpate.
Taxon name: