Suillus ponderosus
Contr. Toward a Mongr. of N. Am. Sp. of Suillus, p. 38, pl. 11. 1964.
Common Name: none
Bessette, A.E., Roody, W.C. & Bessette, A.R. (2000). North American Boletes: A Color Guide to the Fleshy Pored Mushrooms. Syracuse University Press: Syracuse, NY. 400 p.
Smith, A.H. & Thiers, H.D. (1964). A Contribution Toward A Monograph of North American Species of Suillus. Privately Published: Ann Arbor, MI. 116 p. (Protologue)
Thiers, H.D. (1967). California boletes III. The genus Suillus. Madroño 19: 148-160.
Thiers, H.D. (1975). The status of the genus Suillus in the United States. Beih. Nova Hedw. 51: 247-278.
Thiers, H.D. (1975). California Mushrooms—A Field Guide to the Boletes. Hafner Press: New York, NY. 261 p. (WWW)
Thiers, H.D. (1979). The genus Suillus in the Western United States. Mycotaxon 9(1): 285-296.