1 Nhu H. Nguyen, Else C. Vellinga, Thomas D. Bruns & Peter G. Kennedy (2016). Phylogenetic assessment of global Suillus ITS sequences supports morphologically defined species and reveals synonymous and undescribed taxa, Mycologia 108(6): 1216-1228 (also available via ResearchGate)
…as per Nguyen et al., “Phylogenetic assessment of global Suillus ITS sequences supports morphologically defined species and reveals synonymous and undescribed taxa”, Mycologia, 108(6), 2016, pp. 1216–1228.
The paper can be dowloaded from:
S. subalutaceus sits on different tree branch in the phylogram, unrelated to S. acidus. Nguyen et al. write:
“The /subluteus (Japan) clade was sister to (A.H. Sm. & Thiers) A.H. Sm. & Thiers. It was a moderately supported clade of mostly environmental samples, with the majority of sequences from Japan and one from Russia. The clade contained three specimens that were identified as S. subluteus (Peck) Snell. These sequences from Japan clearly do not represent S. subluteus, a species in the /salmonicolor clade. Instead, this represents an unnamed species native to East Asia.”