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Boletellus ananas

[ Basidiomycota > Boletales > Boletaceae > Boletellus . . . ]

by Michael Kuo

Regular readers know that I rarely make a page for a mushroom I have not collected--but take a look at these photos of Boletellus ananas, sent to me in "What's This Mushroom?" e-mails from the Gulf Coast.

Wow. It's hard to imagine a more distinctive bolete, with its red to pink colors and its coarsely shaggy, hairy scales. Other distinguishing features include the partial veil, which covers the young pore surface and later hangs as remnants on the cap margin; the smooth stem with a reddish zone near the apex; and the yellow pore surface that bruises blue and eventually discolors reddish brown.

Gulf Coast readers, would you like to help me study specimens of this species and make this page more scientific and better documented? Please let me know if you have fresh specimens of this incredible mushroom that you'd be willing to document, preserve (don't worry; it's not difficult), and send.


Ecology: Uncertain. Possibly mycorrhizal with pines, but often reported growing from pine wood and roots. Murrill (1910) called it "epixylous" (growing from wood) and reported that Earle considered it "a wound parasite on pine trunks or about the base of living pine trees." The illustrated specimens were growing on the deadwood of an unknown tree, and a palmetto. Some later authors downplay the proximity to wood and treat the species as more or less terrestrial. Growing alone or gregariously; spring, summer, and fall; widely distributed along the Gulf Coast and in southeastern North America, extending at least as far south as Costa Rica. The illustrated specimens were found in Louisiana and Florida.

Cap: 4-15 cm; nearly round at first, becoming convex to broadly convex in age; dry; scaly; the scales large, overlapping, and composed of aggregated woolly hairs; buff to pinkish when young, becoming darker red to purplish red at maturity; the surface becoming stretched and cracked to reveal yellowish flesh; the margin hung with veil remnants.

Pore Surface: Yellow when fresh; bruising quickly blue; discoloring reddish brown to brown with age; pores angular and large; tubes red, to 2 cm deep; at first covered by a whitish to pinkish partial veil.

Stem: 5-14 cm long; up to 2.5 cm. thick; more or less equal; bald; dry; whitish to pinkish or yellowish, with a reddish zone near the apex; basal mycelium whitish.

Flesh: Whitish to yellowish; staining blue when sliced.

Odor and Taste: Not distinctive.

Chemical Reactions: KOH olive yellow, then maroon on cap; yellow on flesh. Ammonia olive yellow on cap. Iron salts green on flesh.

Spore Print: Rusty brown to dark brown.

Microscopic Features: Spores 14-26 x 7-11 µ; ridged lengthwise; fusiform. Hymenial cystidia fusoid-ventricose to mucronate; hyaline; to 50 x 15 µ.

REFERENCES: (Curtis, 1848) Murrill, 1909. (Saccardo, 1888; Coker & Beers, 1943; Singer, 1945; Smith & Thiers, 1971; Smith, Smith & Weber, 1981; Weber & Smith, 1985; Metzler & Metzler, 1992; Both, 1993; Bessette, Roody & Bessette, 2000; Halling & Mueller, 2005.) I have not collected this mushroom.

Further Information Online:

Boletellus ananas in Smith & Thiers, 1971
Boletellus ananas at Macrofungi of Costa Rica

This website contains no information about the edibility or toxicity of mushrooms.


Boletellus ananas

Boletellus ananas

Boletellus ananas

Boletellus ananas

Boletellus ananas

Boletellus ananas

Boletellus ananas

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Kuo, M. (2016, August). Boletellus ananas. Retrieved from the MushroomExpert.Com Web site: