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Invalid or doubtful name

Dictydium ambiguum Schrad., Nov. gen. pl. 13, pl. 4, fig. 2 (1797) [see pdf]

[Probably a Cribraria. Only the stalks and lower portions of the peridia are shown in Schrader's figure. Rostafinski, Sluzowce Monogr. 230. 1875, cited it as a synonym of D. cernuum (Pers.) Nees, citing Nees's fig. 117, which probably does represent D. cancellatum (Batsch) T. Macbr., but does not agree with Schrader's figure or description of D. ambiguum. As noted by Meylan, Bull. Soc. Vaud. Sci. Nat. 57:484. 1937, the application of the name must remain in doubt (apud Martin & Alexopoulos, Myxomycetes 92. 1969)]