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Page number:107 
Remarks (internal):The synonymy is based on my study of the type specimens. Although the description of C. albostramineus was not published until 1913, the type specimen had already been distributed in Torrend's Mycotheca Lusitanica in 1910. Serpula rufa var. pinicola was listed as a synonym of M. taxicola by Bresadola (1903), Torrend (1914), and Bondartsev (1953), but I disagree.
Collections that were labelled C. albostramineus and M. rubicundus from Europe invariably had the hymenium pale ochraceous or cream color, but the type of Karsten's var. pinicola has a reddish-tan hymenium. Collections from North America show the entire range of hymenial colors ascribed to the species and the isolates that were studied were identical in all respects, although they were from basidiocarps which exhibited the range of hymenial colors as is mentioned above. All collections were effused except for RSS 585 from the Solomon Islands, which is effused-reflexed.
In basidiocarps the cystidia are not significantly wider than the basidia and appear to be proliferating basidioles. They were not found in some specimens.
Ceraceomerulius albostramineus is excluded from Meruliopsis because it lacks verticillate clamps and is associated with a brown rot. Four species of Meruliopsis are otherwise similar. Meruliopsis hirtellus and M. bellus have wider spores, 2-2.5 µm; M. miniatus has slightly longer spores and gloeocystidia with refractive con-tents; and although some specimens of M. taxicola are macroscopically similar, they are distinguished by smaller, allantoid spores, 3-5 x 1-I.5 µm. Both species have fusoid cystidioles. Pale ochraceous specimens of C. albostramineus are morphologically similar to Ceraceomyces serpens, but the latter has clamp connections, and spores that are predominantly ovoid, 2-2.5 µm wide with a comparatively broad, truncate apiculus. Several species of Poria are macroscopically quite Merulius-like, e.g., the P. rhodella - P. tarda group. If specimens of these fungi are entered in the above key, the choices maylead to the name Ceraceomerulius albostramineus principally because the spores of these fungi are somewhat similar in shape and in size and their hymenial colorations are like those of C. albostramineus. Poria rhodella has wider, sometimes inflated, hyphae and spores of a slightly different shape (see Lowe 1966). Poria tarda has 'cylindrical' spores (Lowe 1966). Both Porias have a hymenium which develops in a cupulate manner.
Description type:Non-original description 
Description:Ceraceomerulius albostramineus (Torrend) Ginns, comb. nov.
? Merulius albostramineus, Torrend, Brotéria, Sér. Bot. 11 : 70. 1913.
= Serpula rufa var. pinicola Karst., Hedwigia, 35: 45. 1896.
= Merulius armeniacus Bres., Mycologia, 17: 72. 1925; Byssomerulius a., Gilbertson, "Fungi that decay ponderosa pine," Univ. Ariz. Press, Tucson. p. 44. 1974.
= Merulius rubicundus Litsch. in Pilát, Bull. Trimest. Soc. Mycol. Fr. 49: 293. 1934; Byssomerulius r., Parm. Izv. Akad. Nauk Estonsk. S.S.R., Ser. Biol. 16: 384. 1967; Ceraceomerulius r., Eriksson & Ryv. Cortic. N. Europe, 2: 197. 1973.
= Merulius glaucinus var. lutescens Pilát, Bull. Trimest. Soc. Mycol. Fr. 49: 295. 1934.
= Merulius atropurpureus W. B. Cooke, Mycologia, 35: 386. 1943.
= Merulius purpurascens Corner, Gard. Bull. (Singapore), 25: 370. 1971.
Basidiocarps effused, adnate, up to 15 x 5 cm and averaging 0.5 mm thick; margin white to pallid, adnate, granulose to mycelioid, generally 1 to 3 but up to 8 mm wide; hymenium when fresh, white to cream or flesh color; when dry, pale ochraceous, ochraceous, tan, flesh color, rufus, chestnut, or deep reddish-purple, shiny, the folds up to 0.5 mm deep, randomly oriented, interrupted or if continuous anastomosing to form circular, oval, or irregularly shaped pits, two to four per millimetre; context white to cream, about 0.3 mm thick, homogeneous.
Hyphal system monomitic; context hyphae loosely woven, often branched at right angles, hyaline, simple-septate or with very rare clamp connections, thin- or occasionally rather thin-walled, sometimes granule incrusted, particularly near the subhymenium, 2-5(-6) µm in diam; subhymenium and adjacent context impregnated with a yellow granular or resin-likesubstance; hyphoid cystidia sometimes rare or absent, slenderly clavate, utriform to obclavate or lageniform, thin-walled, occasionally capitate incrusted, 22-50 x 3-7 µm, projecting up to 20 µm (Fig. 4); fusoid cystidioles scattered, not projecting; basidia slenderly clavate, 12-24 x 4.5-5.5 µm; spore print white; spore wall thin, hyaline, smooth, IKI-, pale blue in lactic-blue; spores cylindrical to narrowly oblong, in profile allantoid or cylindrical and either bent at the basal end or adaxially slightly concave, 3.5-5.5 x 1.5-2(-2.5) µm (Figs. 2H, 4).
Habitat: Saprophytic on Abies, Picea, Pinus, Pseudotsuga, Thuja, occasionally on Acer, Alnus, Eucalyptus, and Populus, associated with a brown rot.
In North America, south of 50° N latitude, from Quebec, Massachusetts, New York, Pennsylvania, New Jersey, West Virginia, North Carolina, British Columbia, Washington, Oregon, Idaho, Montana, Wyoming, Nevada, Colorado, California, and Arizona; in Europe from Austria, Czechoslovakia, Finland, Germany, Italy, Poland, Portugal, Switzerland, Sweden; also in Siberia, Borneo, Malaya, Solomon Islands, and South Australia. In Europe and North America collected principally from late June through September, occasionally earlier or as late as December in more southern latitudes i.e., Italy and California.
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