Suillus pictus (Peck) (Smith & Thiers) is an ectomycorrhizal mushroom-forming fungus in the family Boletaceae. Fruiting bodies of S. pictus have bright reddish caps covered with dry red hairs, enlarged radial pores, whitish cottony partial veil remnants on stipe, and stipe covered by reddish hairs similar to cap. S. pictus fruits under 5-needle (white) pines and is widely distributed across eastern North America, and also occurs in eastern Asia (Japan, China). Based on molecular systematics, its closest related species is S. decipiens, which preferentially fruits under 2-3 needle (yellow, or hard) pines.
References:
Kretzer, A., Li, Y. N., Szaro, T., & Bruns, T. D. (1996). Internal transcribed spacer sequences from 38 recognized species of Suillus sensu lato: Phylogenetic and taxonomic implications. Mycologia, 88(5), 776–785.
Miller, Jr., O.K., and H.H. Miller. 2006. North American Mushrooms: A Field Guide to Edible and Inedible Fungi. Falconpress, Guilford, Conn.
Smith, A.H. and Thiers, H.D. (1964) A contribution toward a monograph of North American species of Suillus. Ann Arbor.
Weber, N.S. and A.H. Smith. 1985. A field guide to southern mushrooms. Univ. of Michigan Press, Ann Arbor.
Wu, Q. X., Mueller, G. M., Lutzoni, F. M., Huang, Y. Q., & Guo, S. Y. (2000). Phylogenetic and biogeographic relationships of eastern Asian and eastern North American disjunct Suillus species (fungi) as inferred from nuclear ribosomal RNA ITS sequences. Molecular Phylogenetics and Evolution, 17(1), 37–47.
Genome Reference(s)
Lofgren LA, Nguyen NH, Vilgalys R, Ruytinx J, Liao HL, Branco S, Kuo A, LaButti K, Lipzen A, Andreopoulos W, Pangilinan J, Riley R, Hundley H, Na H, Barry K, Grigoriev IV, Stajich JE, Kennedy PG
Comparative genomics reveals dynamic genome evolution in host specialist ectomycorrhizal fungi.
New Phytol. 2021 Apr;230(2):774-792. doi: 10.1111/nph.17160