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Page number:8 
Remarks (internal):In the resupinate condition there is little macroscopic resemblance to the species of Echinodontium with toothed hymenophores. However, the range of forms examined included a representative number of effused-reflexed specimens which were woody and had warted hymenophores. Microscopically E. sulcatum and E. taxodii are distinctive because of their globose to subglobose spores, and paler contexts. E. sulcatum differs from E. taxodii primarily in the presence of highly-branched binding hyphae in the context. E. sulcatum further differs from E. taxodii in having slightly smaller spores with less apparent echinulation, growing usually on dead coniferous wood, and having a pinkish hymenophore. PECK (1901) and OVERHOLTS (1939) note that the hymeno
phore turns red when bruised. Culturally E. sulcatum and E. taxodii are very different, and DAVIDSON et al. (1960) should be consulted for cultural differences. In short, cultures of E. sulcatum form conidiophores and conidia, show a positive oxidase reaction, and are faster growing, while cultures of E. taxodii form chlamydospores and lack or show a weak oxidase reaction.
Description type:Non-original description 
Description:Echinodontium sulcatum (Burt) GrosS, comb. nov. Stereum sulcatum BURT, in PECK, New York State Mus. Ann. Rep. 54: 154. 1901.
Lloydella sulcata (Burt) Killerm., in Engl. & Prantl. Die Natürl. Pflanzenfam. 2nd Ed. 6: 146. 1928.
Laurilia sulcata (Burt) Pouzar, Ceska Mykologie 13: 14. 1959.
Illustrations. Figures 5, 6, 8, and 17; see also Lloyd (1916b), BurT (1920), Imazeki (1939), Overholts (1939), and Lentz (1955).
Macroscopic. Basidiocarps (Figs. 5, 6, and 8) lignicolous, perenr vial, resupinate (Fig. 8) or effused-reflexed (Figs. 5 and 6), leathery to woody, occurring singly or in groups which may coalesce, 2-20 x 0.5-2 x 0.2-1 cm, resupinate forms effused up to 30 cm; uppesurface Brussels Brown to Bister, tomentose, tomentum underlain by a darker layer of tissue appearing as a dark line in cross section (this blackish layer is also found next to the substrate), when the tomentum is worn off the surface is composed of this tissue, Dusky Brown to Bister, rugose, sulcate, sometimes zonate; margin same color as the tomentum, usually confluent with the tomentum of the upper surface, in reflexed specimens acute, undulating, 1-2 mm wide, tomentose, in resupinate specimens byssoid, extending up to 1 cm beyond the hymenium, or absent; context Light Pinkish Cinnamon to Pale Ochraceous Salmon, texture leathery to woody, 2-4 mm (up to 1 cm) thick; hymenophore the same color as the context, smooth to warted, texture chalky to dry-paintlike; warts more pronounced in reflexed portions, up to 1 cm long, inner tissue darker, sometimes with a core of blackish tissue.
Microscopic. Context hyphae of three types; skeletal hyphae (Fig. 17e) thick-walled to solid, 3-5 µm in diam, pale yellow, not darkening in KOH solution, rarely nodose-septate, regularly branched, interwoven; binding hyphae (Fig. 17f) thick-walled with a narrow lumen or solid, frequently branched, interwoven; generative hyphae (Fig. 17g) thin-walled, 3-4 µm in diam, hyaline, smooth, nodose-septate with occasional secondary simple septa, frequently branched; hyphae of the tomentum similar to context hyphae except brown colored, darkening slightly in KOH solution, loosely arranged; hyphae of the darker tissue under the tomentum mostly skeletal, highly branched, appearing maroon in KOH solution; hymenium hyaline; sub-hymenium stratified or continuous, rarely with a layer of context between previous hymenia, up to 500 µm thick; cystidia (Fig. 17a) fusiform to subulate, 35-65 x 6-10 µm, upper portions incrusted, usually protruding up to 20 µm, originally thinwalled and hyaline, becoming thick-walled (Fig. 17b) and colored similar to skeletal hyphae; basidia (Fig. 17c) clavate, 20-35 x 4-6 µm, hyaline, 4-sterigmate; spores (Fig. 17d) globose to subglobose, 5-6.5 x 4.5-6 µm, hyaline, strongly amyloid, echinulate.
Rot character. Echinodontium sulcatum causes a white' pocket rot of dead coniferous wood. The rot is very similar in appearance to rot caused by Fomes pini (THORE ex PERS.) LLOYD. Oxidase reaction on gallic or tannic acid media is positive.
Substrate. Many conifers.
Range. Apparently throughout the North Temperate Zone.
Known from the United States (including Alaska), Canada, Austria, Siberia, China, Japan, Sweden, and Finland.
Specimens examined. SYNTYPE-Floodwood, Franklin Co., New York, on Tsuga canadensis (L.) CARR., C. H. PECK, August (NYS); SYNTYPE-Adirondacks, New York, on Picea, C. H. PECK, September (NYS).
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