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 Add this item to the list   'Merulius' aureus Fr., Elenchus, 1: 62. 1828.
   
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Page number:120 
Remarks (internal):Romell (1911) and Bourdot and Galzin (1928) also cite X. croceum as a synonym of 'M.' aureus.
In KOH, fragments of the basidiocarp exude a yellow pigment which is not produced in water. It may be the same pigment that is observed in malt agar cultures. Although the spores become blue in lactic-blue, no differential staining of layers within the wall was seen.
M. baileyi and 'M.' elliottii have spores that are nearly identical with those of 'M.' aureus. They differ from 'M.' aureus principally in having hyphae up to 10 µm in diam and both simple septa and clamps. In addition these species are readily separated from 'M.' aureus and from each other on the basis of gross morphological features.
'M.' aureus is not typical of the genus Merulius, and although it has similarities with the species of Plicatura, it is not a member of that genus in that it differs in cultural characters, is associated with a brown rot, and occurs only on the wood of gymnosperms. The microscopic feature of the basidiocarps of 'M.' aureus and its cultural characteristics are similar to the small-spored Paxillus species, e.g. P. panuoides Fr., P. curtisii Berk. and P. aureus Lloyd. These four species may be congeneric, but I am not prepared to propose a transfer.
 
Description type:Non-original description 
Description:'Merulius' aureus Fr., Elenchus, 1: 62. 1828.
? Serpula a., Karst., Bidrag Kännedom Finlands Natur Folk, 48: 344. 1889; Plicatura a., Parm., Izv. Akad. Nauk Estonsk. S.S.R., Ser. Biol. 16: 393. 1967.
= Xylomyzon croceum Pers., Mycol. Eur. 2: 33. 1825; Merulius c., Duby, Bot. Gall. 2: 796. 1830.
= X. solare Pers., Mycol. Eur. 2: 29. 1825, fide Fries, Elenchus, I: 62. 1828.
Basidiocarps annual, effused or effused-reflexed, frequently confluent, separable when fresh, generally 1 x 2 cm and averaging 1 mm thick; margin when fresh, white at the extreme edge becoming sulfur-yellow to bright greenish-yellow,tomentose, abrupt, mound-like; when dry, usually pallid, abruptly demarcated from the hymenium, raised, tomentose to cottony, up to 2 mm wide; the reflexed surface firm, up to 5 mm wide and less than 5 mm thick, pallid or yellowish, finely tomentose to matted tomentose, azonate; hymenium when fresh, yellow to brownish, bright yellow at the margin; when dry, darker, fawn, ochraceous to brown, crust-like, the folds narrow, up to 2 mm deep, continuous, radiating, frequently raduloid, sometimes anastomosing to form irregular pits, one or two per millimetre; context fragile, white when fresh, pallid in dried specimens, homogeneous.
Hyphal system monomitic; context hyphae loosely woven to relatively closely packed, branching frequently and often at a clamp, with large clamp connections, thin-walled, anastomosing, 2-5 µm in diam, often incrusted with amorphous, yellowish, resin-like deposits; subhymenium about 30 µm thick with hyphae closely woven (Fig. 8); cystidia lacking; basidia clavate, often with the basal 5 µm flared, 14-20 x 4-6 µm; spore print distinctly yellowish or olive yellow on paper and pallid on glass slides; spore wall hyaline to pale yellowish, smooth, slightly thickened, IKI-, quickly distinctly blue in lactic-blue; spores short-oblong, in profile cylindrical or tapering apically to reniform, some biguttulate, 3.5-4.5(-5) x 1.5-2(-2.5) µm (Figs. 2E, 8).
Habitat: Saprophytic on wood and bark of gymnosperms, particularly Pinus, associated with a brown rot. In North America from Nova Scotia, New Brunswick, Quebec, Maine, New Hampshire, Vermont, Massachusetts, Connecticut, New York, Ontario, Pennsylvania, New Jersey, Maryland, Virginia, North Carolina, South Carolina, Georgia, Alabama, Louisiana (Lowy and Welden 1959), Indiana, Michigan, Minnesota, Manitoba, Alberta, Montana, Idaho, British Columbia, Washington, New Mexico, Arizona, and, in Mexico, Cingambato. Also in Sweden, Finland (Karsten 1876, p. 283), Den-mark (Lind 1913), Poland, U.S.S.R. (European part) (Nikolajeva 1933), Siberia (Nikolajeva 1933), Estonia (Parmasto 1962), Austria, France, Italy, Japan, and India (Bakshi and Singh 1958). The reports (Berkeley 1881, Cooke 1892) of 'M.' aureus from Australia are doubtful because Cunningham (1963, p. 333) was unable to find any specimens. In North America collected principally in August and September, rarely in June and November; in addition in the southern United States and Mexico, 'M.' aureus is collected from December through June.
Type: Xylomyzon croceum, ex Monte Jura, (Chaillet), Herb. No. 910.277-307 (L).
 
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