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Page number:185 
Remarks (internal):Trichoderma aurea Persoon (Syn. Fung. p. 232. 1801) has often been cited by authors, even by Link himself, as the type of Oidium aureum, but there is little doubt that the fungus Link pictured is quite distinct from that figured by Persoon who later (l.c.) in making the combination of Acrosporium aureum definitely credits the species to Link and states that his Trichoderma aurea is quite distinct. It appears from Persoon's figure that he was correct, but that his fungus should be placed in Penicillium. For these reasons Oidium aureum is credited to Link in this paper. There is little doubt that Alysidium fulvum of Kunze and Schmidt is a synonym of O. aureum for these authors state that "Es bildet anfangs goldgelbe, dann in das Rötliche überziehende, bey dem Trocknem aber wiederum verbleichende, ... " colonies, and Corda (l.c.) in discussing Torula fulva states that they are morphologically alike although they differ in color, but this difference may well be explained by Kunze and Schmidt's statement quoted above. Apparently there has also been some confusion between this species and O. hesperidicum for Saccardo (Syll. Fung. 4: 33. 1886) reduced his species to synonymy under O. aureum, but it seems from the single collection studied by the writer, that Saccardo's species is clearly distinguished by the color of the colony and by the closely aggregated or somewhat fasciculate conidiophores that give the colonies a tufted appearance. The specimen cited by Sumstine as O. aureum (Mycologia 5: 48. 1913) produced smaller conidia than O. aureum and should be considered to be O. ochraceum. O. Murrilliae, described from Mexico appears to be a synonym of O. aureum, and is the only representative of the species that has been reported from the Western Hemisphere. The description furnished by Sumstine certainly agrees in all details with that made by the writer from the European material, but unfortunately the type specimen of the former was not available for study. Monilia platensis and M. Harknessi, as well as the additional species M. effusa Peck (N. Y. State Mus. Rept. 42: 128. 1889) also were not available for study, but it seems more than likely that they may fall into synonymy under O. aureum.
 
Description type:Non-original description 
Description:Oidium aureum Link, Obs. in Ord. 11: 18. fig. 29. 1809; Fries, Syst. Myc. 3 : 429. 1829.
Alysidium fulvum Kunze & Schmidt, Myk. Hefte 1: 11. pl. 1, fig. 6. 1817.
Acrosporium fulvum (Kze. & Schm.) Persoon, Myc. Eur. I: 24. 1822.
Acrosporium aureum (Lk.) Persoon, Myc. Eur. is 25. 1822.
Oidium fulvum (Kze. & Schm.) Link, in Linnaeus, Sp. Pl. ed. IV. 6: 121. 1824; Fries, Syst. Myc. 3: 430. 1829.
Torula aurea (Lk.) Corda, in Sturm, Deutschl. Fl. Abt. III. i(8): 79. fig. 36. 1829; Icon. Fung. 2: 8. fig. 35. 1838.
Torula fulva (Kze. & Schm.) Corda, in Sturm, Deutschl. Fl. Abt. III I(8): 81. fig. 37. 1829.
Oospora aurea (Lk.) Wallroth, Fl. Crypt. Germ. 2: 183. 1833.
?Monilia Harknessi Peck, N. Y. State Mus. Rept. 34: 49. 1881.
?Monilia platensis Spegazzini, Anal. Mus. Nac. Buenos Aires, 8: 86. 1902.
Oidium Murrilliae Sumstine, Mycologia 5: 49. pl. 82, fig. 6. 1913.
Plate 4, Fig. A.
Colonies mostly effuse and closely but not densely hypochnoid, yellow when fresh, tawny or "Dark olive buff" when dry. The vegetative, mycelium is repent, 4.5-7 µm in diameter, hyaline or nearly so, much branched and rather frequently anastomosing. Conidiophores erect or ascending, up to Zoo µm long, 7.5-9 µm in diameter, few septate, hyaline except for some of the terminal spore-bearing cells that are distinctly yellowish under the microscope and which may be somewhat tapering or else slightly inflated, sparsely branched, the branches arcuate-ascending. Sporogenous teeth short, 2 x 11.5-3 µm, or as hyaline scars. Conidia yellowish (19.8)-23.5-25.5 x (10)-11-14.5 µm, lemon-shaped and with an apiculus at either end or not infrequently with two apiculi at the outer end, one of which is obliquely attached, the conidia at the base of the chains are somewhat elongate and are truncate at the base, anastomoses between the conidia infrequent.
Specimen examined: Germany, Bergenlagen, Tamsel, Dec. 1, 1926, P. Vogel (FH).

 
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