Katherine is responsible for today’s entry. She writes:
Suillus paluster is commonly known as a red bog bolete, marsh bolete or swamp bolete, and is also scientifically known by these synonyms: Boletus paluster>, Boletinellus paluster, Boletinus paluster, and Fuscoboletinus paluster. If searching for more information about it online, you’ll get better results by searching for Fuscoboletinus paluster or Boletus paluster, as these names were in common use (and still persist) for many years. Suillus paluster was proposed in 1996, by Kretzer et al. in Internal Transcribed Spacer Sequences from 38 Recognized Species of Suillus sensu lato: Phylogenetic and Taxonomic Implications (Mycologia, 88(5): 776-785).
The caps of Suillus paluster are 2-7cm wide, broadly convex to plane or slightly depressed, and pale pinkish-purple to reddish-purple in colour. The pore surface is 1.5-3mm and pale yellow becoming more golden yellow and brownish with age, and does not turn blue when cut. The stalks are 2-5cm long and 3-7mm thick, and flesh is yellowish white to yellow in the cap, but reddish under the pileipellis and white in the stalk. Suillus paluster has a non-distinct odour and a mild or slightly acidic taste. Marsh bolete is found in sphagnum mosses under larch, throughout “eastern Canada south to Pennsylvania, west to Wisconsin”. It is also associated with Pinus taiwanensis in Taiwan (PDF), and can additionally be found in China (Sichuan), Japan and the Republic of Karelia in Russia (where it grows in association with larch). Suillus paluster is edible, and fruits throughout August to November.