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Remarks (internal):Ceratobasidium anceps is distinguished by its comparatively large, ventrally depressed basidiospores, its parasitic habit on leaves, especially of bracken (Pteridium), and its formation of sclerotia in culture and infection cushions on hosts (Gregor, 1935).
The species is morphologically close to Ceratobasidium cornigerum, with a basidiospore range which overlaps, though the spores of C. anceps are on average larger and narrower (compare Table 4 and Table 7). It is possible that Ceratobasidium anceps may represent the teleomorph of one or more of the binucleate anastomosis groups (AGs) currently associated with C. cornigerum. Since cultured strains of C. anceps (sensu Jackson) still exist (Andersen, 1996), this possibility could be tested.
Jackson (1949) noted that Sclerotium deciduum represented the anamorph of C. anceps, many authentic collections having been found to contain basidia and basidiospores. On this basis, the new combination Ceratorhiza decidua is here proposed for the anamorph of Ceratobasidium anceps, with a lectotype selected from among the authentic specimens cited by Jackson (1949).
 
Description type:Non-original description 
Description:Ceratobasidium anceps (Bres. & Syd.) H.S. Jacks., Can. J. Res. C27: 243 (1949).Figures 10 & 11
Tulasnella anceps Bres. & Syd., in Syd., Ann. Myc. 8: 490 (1910). Corticium anceps (Bres. & Syd.) Gregor, Ann. Myc. 30: 464 (1932).
Anamorph: Ceratorhiza decidua (JJ. Davis) P. Roberts comb. nov. Sclerotium deciduum J.J. Davis, Trans. Wisconsin Acad. Sci. 19: 689 (1919).
Teleomorph. Basidiome: thin, effused, hypochnoid, ochraceous when dried. Hymenium: thin, open textured, composed of a single layer of basidia on laterally branching hyphae arising from an open network of subicular hyphae. Hyphae: binucleate (Jackson, 1949), 3-7 µm wide, lacking clamp connexions; hyaline and thin-walled in the subhymenium, composed of short, somewhat swollen, hyphal compartments; hyaline to tinted ochraceous in the subiculum, with thin to slightly thickened walls, composed of long, straight, hyphal compartments. Septal pores: dolipore septa with discontinuous parenthesomes (Andersen, 1996). Basidia: broadly clavate to ellipsoid (Q= 1.1-1.3), 12-14 x 9-11 µm, normally with short, wide, often lateral stalk; basidia are frequently pleural and then appear cuboid to papillate. Sterigmata: four, measuring 8-16 x 1.5-2 µm. Basidiospores: oblong to cylindrical (Q = 1.8-2.3), often ventrally depressed, (7-)9-12.5 x (4-)5-6 µm, producing secondary spores by replication.
Anamorph. The Ceratorhiza anamorph forms sclerotia up to 5 mm diam., cream at first then dark brown (Gregor, 1932; 1935). Monilioid hyphae are presumed also to occur.
Habitat & ecology. In Europe, known only from living fronds of bracken (Pteridium) and other ferns. In North America, known from a wide range of hosts (Jackson, 1949; Ginns & Lefebvre, 1993). Parasitic on its hosts, mainly causing leaf blights (Jackson, 1949).
Distribution. North temperate. Europe: British Isles (K); Germany (K); North America: Canada (K); USA (Jackson, 1949).
Type collections. Germany: Mecklenberg bei Graal, on Pteridium, Aug. 1908, H. Sydow (Myc. Germ. 858), K(M) 35724, isotype (!).
(Anamorph) USA: Wisconsin, Devil's Lake, 5th Aug. 1913, on Adiantum pedatum, TRTC, lectotype.
Additional illustrations. Gregor (1935); Jackson (1949).
 
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